Debt - Long-Term Debt (Detail) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Total debt	$ 5,414	$ 5,413
Less: current maturities	(125)	(125)
Long-term debt	5,289	5,288
7% Debentures, Due 2025
Debt Instrument [Line Items]
Total debt	125	125
3.450% Senior Notes, Due 2027
Debt Instrument [Line Items]
Total debt	299	299
3.500% Senior Notes, Due 2027
Debt Instrument [Line Items]
Total debt	493	493
2.500% Senior Notes, Due 2030
Debt Instrument [Line Items]
Total debt	473	472
2.400% Senior Notes, Due 2031
Debt Instrument [Line Items]
Total debt	890	890
5.150% Senior Notes, Due 2034
Debt Instrument [Line Items]
Total debt	738	738
6.25% Senior Notes, Due 2037
Debt Instrument [Line Items]
Total debt	228	228
4.250% Senior Notes, Due 2047
Debt Instrument [Line Items]
Total debt	591	591
3.200% Senior Notes, Due 2051
Debt Instrument [Line Items]
Total debt	851	851
5.500% Senior Notes, Due 2054
Debt Instrument [Line Items]
Total debt	$ 726	$ 726

Supplemental Cash Flow Information

3 Months Ended

Mar. 31, 2025

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information

12.

Supplemental Cash Flow Information

Noncash investing and financing activities are as follows:


	Three Months Ended
	March 31,
	2025			2024
	(Dollars in Millions)
Accrued liabilities for purchases of property, plant and equipment	$	47		$	35
Right-of-use assets obtained in exchange for new operating lease liabilities	$	26		$	17
Right-of-use assets obtained in exchange for new finance lease liabilities	$	4		$	5
Remeasurement of operating lease right-of-use assets	$	(1	)	$	—
Remeasurement of finance lease right-of-use assets	$	50		$	—

Supplemental disclosures of cash flow information are as follows:


	Three Months Ended
	March 31,
	2025		2024
	(Dollars in Millions)
Cash paid for interest, net of capitalized amount	$	31	$	39
Cash paid for income taxes, net of refunds	$	1	$	3

Income Taxes	3 Months Ended
Mar. 31, 2025
Income Tax Disclosure [Abstract]
Income Taxes	7. Income Taxes The Company's effective income tax rate reflects the effect of federal and state income taxes on earnings and the impact of differences in book and tax accounting arising primarily from the permanent tax benefits associated with the statutory depletion deduction for mineral reserves. The effective income tax rates were 21.3% and 26.0% for the three months ended March 31, 2025 and 2024, respectively. The higher 2024 effective income tax rate versus 2025 was driven by the impact of the February 2024 divestiture of the South Texas cement business and certain related ready mixed concrete operations, which reflected the write off of certain nondeductible goodwill and was treated as a discrete tax event. The Internal Revenue Service has provided certain disaster tax relief for North Carolina businesses affected by Hurricanes Debby and Helene, which allows the Company to defer estimated federal and certain state income, payroll and excise tax payments for the period from August 2024 through September 2025. The deferred obligation will be due September 25, 2025. The Company had deferred income tax payments of $102 million under this provision as of March 31, 2025.

Income Taxes

3 Months Ended

Mar. 31, 2025

Income Tax Disclosure [Abstract]

Income Taxes

The Company's effective income tax rate reflects the effect of federal and state income taxes on earnings and the impact of differences in book and tax accounting arising primarily from the permanent tax benefits associated with the statutory depletion deduction for mineral reserves. The effective income tax rates were 21.3% and 26.0% for the three months ended March 31, 2025 and 2024, respectively. The higher 2024 effective income tax rate versus 2025 was driven by the impact of the February 2024 divestiture of the South Texas cement business and certain related ready mixed concrete operations, which reflected the write off of certain nondeductible goodwill and was treated as a discrete tax event.

The Internal Revenue Service has provided certain disaster tax relief for North Carolina businesses affected by Hurricanes Debby and Helene, which allows the Company to defer estimated federal and certain state income, payroll and excise tax payments for the period from August 2024 through September 2025. The deferred obligation will be due September 25, 2025. The Company had deferred income tax payments of $102 million under this provision as of March 31, 2025.

- Definition

The entire disclosure for income tax.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-12

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 740
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-Name Accounting Standards Codification
-Section 55
-Paragraph 231
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482663/740-10-55-231

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12C
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-12C

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
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-Name Accounting Standards Codification
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-Paragraph 12B
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-Name Accounting Standards Codification
-Section 50
-Paragraph 1
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-URI https://asc.fasb.org/1943274/2147477891/740-270-50-1

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-Paragraph 1
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480990/946-20-50-13

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-Topic 235
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-Name Accounting Standards Codification
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
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-Topic 740
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-Paragraph 2
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Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482603/740-30-50-2

+ Details

Other Operating (Expense) Income, Net	3 Months Ended
Mar. 31, 2025
Other Income and Expenses [Abstract]
Other Operating (Expense) Income, Net	13. Other Operating (Expense) Income, Net Other operating income, net, is comprised generally of gains and losses on divestitures and the sale of assets; asset and portfolio rationalization charges; recoveries and losses related to certain customer accounts receivable; recoveries and losses on the resolution of contingency accruals; rental, royalty and services income; and accretion expense and depreciation expense related to asset retirement obligations. For the three months ended March 31, 2024, other operating income, net, included a $1.3 billion pretax gain on the divestiture of the South Texas cement business and certain of its related ready mixed concrete operations, which was partially offset by a $49 million pretax, noncash asset and portfolio rationalization charge. The noncash asset and portfolio rationalization charge for the three months ended March 31, 2024 relates to the Company's decision to discontinue usage of certain long-haul distribution facilities to transport aggregates products into Colorado as the Albert Frei & Sons, Inc. acquisition completed in January 2024 provides more economical, local aggregates supply. This charge, which is reported in the West Group, reflects the Company's evaluation of the recoverability of certain long-lived assets, including property, plant and equipment and operating lease right-of-use assets, for the cessation of these railroad operations.

Other Operating (Expense) Income, Net

3 Months Ended

Mar. 31, 2025

Other Income and Expenses [Abstract]

Other Operating (Expense) Income, Net

13.

Other Operating (Expense) Income, Net

Other operating income, net, is comprised generally of gains and losses on divestitures and the sale of assets; asset and portfolio rationalization charges; recoveries and losses related to certain customer accounts receivable; recoveries and losses on the resolution of contingency accruals; rental, royalty and services income; and accretion expense and depreciation expense related to asset retirement obligations. For the three months ended March 31, 2024, other operating income, net, included a $1.3 billion pretax gain on the divestiture of the South Texas cement business and certain of its related ready mixed concrete operations, which was partially offset by a $49 million pretax, noncash asset and portfolio rationalization charge.

The noncash asset and portfolio rationalization charge for the three months ended March 31, 2024 relates to the Company's decision to discontinue usage of certain long-haul distribution facilities to transport aggregates products into Colorado as the Albert Frei & Sons, Inc. acquisition completed in January 2024 provides more economical, local aggregates supply. This charge, which is reported in the West Group, reflects the Company's evaluation of the recoverability of certain long-lived assets, including property, plant and equipment and operating lease right-of-use assets, for the cessation of these railroad operations.

Revenues and Gross Profit - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Revenue Recognition [Line Items]
Gross profit	$ 335	$ 272
Performance obligations, description of timing	Performance obligations within paving service agreements are satisfied over time, primarily ranging from one day to two years. Customer payments for the paving operations are based on a contractual billing schedule and are typically "paid-when-paid", meaning the Company is paid once the customer is paid.
Future revenues from unsatisfied performance obligations	$ 297	246
Service revenues	1,353	1,251
Interproduct Revenues
Revenue Recognition [Line Items]
Service revenues	(49)	(39)
West Group \| Operating Segments
Revenue Recognition [Line Items]
Service revenues	667	644
Service \| CALIFORNIA and COLORADO \| West Group
Revenue Recognition [Line Items]
Service revenues	$ 36	$ 26
Minimum \| Service
Revenue Recognition [Line Items]
Performance obligations, period	1 day
Maximum \| Service
Revenue Recognition [Line Items]
Performance obligations, period	2 years

Significant Accounting Policies - Noncurrent Deferred Tax Assets Recorded in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Equity [Abstract]
Balance at beginning of period	$ 41	$ 54
Tax effect of other comprehensive earnings	(1)	(1)
Balance at end of period	$ 40	$ 53

Debt - Long-Term Debt (Parenthetical) (Detail)	3 Months Ended
Debt - Long-Term Debt (Parenthetical) (Detail)	Mar. 31, 2025
7% Debentures, Due 2025
Debt Instrument [Line Items]
Maturity year	2025
Interest rate on notes	7.00%
3.450% Senior Notes, Due 2027
Debt Instrument [Line Items]
Maturity year	2027
Interest rate on notes	3.45%
3.500% Senior Notes, Due 2027
Debt Instrument [Line Items]
Maturity year	2027
Interest rate on notes	3.50%
2.500% Senior Notes, Due 2030
Debt Instrument [Line Items]
Maturity year	2030
Interest rate on notes	2.50%
2.400% Senior Notes, Due 2031
Debt Instrument [Line Items]
Maturity year	2031
Interest rate on notes	2.40%
5.150% Senior Notes, Due 2034
Debt Instrument [Line Items]
Maturity year	2034
Interest rate on notes	5.15%
6.25% Senior Notes, Due 2037
Debt Instrument [Line Items]
Maturity year	2037
Interest rate on notes	6.25%
4.250% Senior Notes, Due 2047
Debt Instrument [Line Items]
Maturity year	2047
Interest rate on notes	4.25%
3.200% Senior Notes, Due 2051
Debt Instrument [Line Items]
Maturity year	2051
Interest rate on notes	3.20%
5.500% Senior Notes, Due 2054
Debt Instrument [Line Items]
Maturity year	2054
Interest rate on notes	5.50%

Debt (Tables)

3 Months Ended

Mar. 31, 2025

Debt Disclosure [Abstract]

Long-Term Debt


	March 31,			December 31,
	2025			2024
	(Dollars in Millions)
7% Debentures, due 2025		125			125
3.450% Senior Notes, due 2027		299			299
3.500% Senior Notes, due 2027		493			493
2.500% Senior Notes, due 2030		473			472
2.400% Senior Notes, due 2031		890			890
5.150% Senior Notes, due 2034		738			738
6.25% Senior Notes, due 2037		228			228
4.250% Senior Notes, due 2047		591			591
3.200% Senior Notes, due 2051		851			851
5.500% Senior Notes, due 2054		726			726
Total debt		5,414			5,413
Less: current maturities		(125	)		(125	)
Long-term debt	$	5,289		$	5,288

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-SubTopic 10
-Topic 210
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
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Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
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-URI https://asc.fasb.org/1943274/2147481568/470-20-55-69E

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04(a))
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Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
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-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
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-Section 50
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-URI https://asc.fasb.org/1943274/2147481112/505-10-50-7

+ Details

Goodwill

3 Months Ended

Mar. 31, 2025

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill

The following table shows the changes in goodwill by reportable segment and in total:


	East			West
	Group			Group		Total
	(Dollars in Millions)
Balance at January 1, 2025	$	1,031		$	2,736	$	3,767
Adjustments to purchase price allocations		(1	)		7		6
Balance at March 31, 2025	$	1,030		$	2,743	$	3,773

Debt - Additional Information (Detail)	3 Months Ended
Debt - Additional Information (Detail)	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
Debt Instrument [Line Items]
Maximum consolidated debt reduction for unrestricted cash and temporary investments for debt covenant calculation	$ 500,000,000
Outstanding letters of credit	37,000,000
Revolving Facility
Debt Instrument [Line Items]
Credit facility commitment	$ 800,000,000
Debt instrument maturity period	Dec. 21, 2029
Outstanding borrowing under credit facility	$ 0	$ 0
Senior unsecured revolving facility, maturity period	5 years
Outstanding letters of credit	$ 3,000,000	3,000,000
Maximum \| Including Acquisition Bridge Debt
Debt Instrument [Line Items]
Debt covenant	3.5
Maximum \| Excluding Acquisition Bridge Debt
Debt Instrument [Line Items]
Debt covenant	4
Trade Receivable Facility
Debt Instrument [Line Items]
Line of credit, trade receivable securitization facility	$ 400,000,000
Debt instrument maturity period	Sep. 17, 2025
Basis spread on variable rate	0.80%
Outstanding borrowing under credit facility	$ 0	$ 0
Trade Receivable Facility \| Maximum
Debt Instrument [Line Items]
Credit facility commitment	$ 500,000,000

Significant Accounting Policies - Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) - Pension and Postretirement Benefit Plans - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Earnings from Continuing Operations	$ 1	$ 1
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Tax effect	(1)	(1)
Earnings from Continuing Operations	1	1
Reclassification out of Accumulated Other Comprehensive Income \| Other Nonoperating Income, Net
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of prior service cost	$ 2	$ 2

- Definition

Amount after tax of reclassification adjustments of other comprehensive income (loss).

+ References + Details

Significant Accounting Policies - Comprehensive Earnings Attributable to Martin Marietta Materials Incorporated (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 116	$ 1,045
Other comprehensive earnings, net of tax	1	0
Consolidated comprehensive earnings attributable to Martin Marietta	$ 117	$ 1,045

- Definition

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

+ References + Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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+ Details

Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2025	Apr. 25, 2025
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2025
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	Q1
Trading Symbol	MLM
Entity Registrant Name	MARTIN MARIETTA MATERIALS, INC.
Entity Central Index Key	0000916076
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	false
Title of 12(b) Security	Common Stock (Par Value $0.01)
Security Exchange Name	NYSE
Entity File Number	1-12744
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Incorporation, State or Country Code	NC
Entity Tax Identification Number	56-1848578
Entity Address, Address Line One	4123 Parklake Avenue
Entity Address, City or Town	Raleigh
Entity Address, State or Province	NC
Entity Address, Postal Zip Code	27612
City Area Code	919
Local Phone Number	781-4550
Document Quarterly Report	true
Document Transition Report	false
Entity Common Stock, Shares Outstanding		60,285,411

Business Combinations and Divestitures - Additional Information (Detail) $ in Millions				3 Months Ended
	Apr. 05, 2024 USD ($) Facility	Feb. 09, 2024 USD ($) Plant	Jan. 12, 2024	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)
Business Acquisition [Line Items]
Business combination periods for production level			60 years
Revenues		$ 2,100
Divestitures number of south texas ready mix operations \| Plant		20
Pretax gain					$ 1,300
Reduction in goodwill				$ (6)
Blue Water Industries LLC
Business Acquisition [Line Items]
Number of active aggregates operations \| Facility	20
Payments to acquire businesses gross	$ 2,050

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Mar. 31, 2025
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Financial Instruments - Additional Information (Detail) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Debt Instruments [Abstract]
Long-term debt, carrying values	$ 5,414	$ 5,413
Long-term debt, fair values	$ 4,900	$ 4,800

- Definition

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

+ References + Details

Supplemental Cash Flow Information (Tables)

3 Months Ended

Mar. 31, 2025

Supplemental Cash Flow Elements [Abstract]

Schedule of Noncash Investing and Financing Activities

Noncash investing and financing activities are as follows:


	Three Months Ended
	March 31,
	2025			2024
	(Dollars in Millions)
Accrued liabilities for purchases of property, plant and equipment	$	47		$	35
Right-of-use assets obtained in exchange for new operating lease liabilities	$	26		$	17
Right-of-use assets obtained in exchange for new finance lease liabilities	$	4		$	5
Remeasurement of operating lease right-of-use assets	$	(1	)	$	—
Remeasurement of finance lease right-of-use assets	$	50		$	—

Supplemental Disclosures of Cash Flow Information

Supplemental disclosures of cash flow information are as follows:


	Three Months Ended
	March 31,
	2025		2024
	(Dollars in Millions)
Cash paid for interest, net of capitalized amount	$	31	$	39
Cash paid for income taxes, net of refunds	$	1	$	3

Significant Accounting Policies - Basic and Diluted Earnings from Continuing Operations Per Common Share (Detail) - shares shares in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Earnings Per Share [Abstract]
Basic weighted-average common shares outstanding	60.9	61.8
Effect of dilutive employee and director awards	0.1	0.2
Diluted weighted-average common shares outstanding	61.0	62.0

Business Combinations and Divestitures - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Parenthetical) (Detail) $ in Billions	Apr. 05, 2024 USD ($)
Business Combinations [Abstract]
Mineral reserves	$ 1.9

Significant Accounting Policies - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2025 Facility State Segment
Significant Accounting Policies [Line Items]
Number of quarries and yards \| Facility	390
Number of states in which entity operates \| State	28
Reportable business segments \| Segment	2

Consolidated Balance Sheets (Parenthetical) (Unaudited) - $ / shares	Mar. 31, 2025	Dec. 31, 2024
Statement of Financial Position [Abstract]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares outstanding	60,278,790	61,126,646
Preferred stock, par value	$ 0.01	$ 0.01

Revenues and Gross Profit - Additional Information (Detail 1)	Mar. 31, 2025	Mar. 31, 2024
Minimum \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2024-04-01
Revenue Recognition [Line Items]
Performance obligations, customer satisfaction period		1 month
Minimum \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2025-04-01
Revenue Recognition [Line Items]
Performance obligations, customer satisfaction period	1 month
Maximum \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2024-04-01
Revenue Recognition [Line Items]
Performance obligations, customer satisfaction period		21 months
Maximum \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2025-04-01
Revenue Recognition [Line Items]
Performance obligations, customer satisfaction period	33 months

Inventories, Net

3 Months Ended

Mar. 31, 2025

Inventory Disclosure [Abstract]

Inventories, Net


	March 31,			December 31,
	2025			2024
	(Dollars in Millions)
Finished products	$	1,394		$	1,327
Products in process		23			24
Raw materials		90			65
Supplies and expendable parts		159			162
Total inventories		1,666			1,578
Less: allowances		(493	)		(463	)
Inventories, net	$	1,173		$	1,115

Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Income Tax Disclosure [Abstract]
Effective income tax rates for continuing operations	21.30%	26.00%
Deferred income tax payments	$ 102

Revenues and Gross Profit - Total Revenues and Gross Profit (Loss) by Product Line (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Product Information [Line Items]
Revenues	$ 1,353	$ 1,251
Gross profit (loss)	335	272
Interproduct Revenues
Product Information [Line Items]
Revenues	(49)	(39)
Corporate
Product Information [Line Items]
Revenues	0	0
Gross profit (loss)	(1)	(5)
Building Materials Business \| Operating Segments
Product Information [Line Items]
Revenues	1,266	1,170
Gross profit (loss)	298	248
Magnesia Specialties \| Operating Segments
Product Information [Line Items]
Revenues	87	81
Gross profit (loss)	38	29
Aggregates \| Building Materials Business \| Operating Segments \| Reportable Subsegments
Product Information [Line Items]
Revenues	1,002	885
Gross profit (loss)	297	239
Cement and ready mixed concrete \| Building Materials Business \| Operating Segments \| Reportable Subsegments
Product Information [Line Items]
Revenues	233	265
Gross profit (loss)	24	31
Asphalt and paving services \| Building Materials Business \| Operating Segments \| Reportable Subsegments
Product Information [Line Items]
Revenues	80	59
Gross profit (loss)	$ (23)	$ (22)

Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2025

Significant Accounting Policies [Line Items]

Consolidated Comprehensive Earnings

Consolidated comprehensive earnings attributable to Martin Marietta are as follows:


	Three Months Ended
	March 31,
	2025		2024
	(Dollars in Millions)
Net earnings attributable to Martin Marietta	$	116	$	1,045
Other comprehensive earnings, net of tax		1		—
Consolidated comprehensive earnings attributable to Martin Marietta	$	117	$	1,045

Changes in Accumulated Other Comprehensive Loss Net of Tax

The components of the changes in accumulated other comprehensive loss, net of tax, are as follows:


	(Dollars in Millions)
	Pension and Postretirement Benefit Plans			Foreign Currency			Accumulated Other Comprehensive Loss
	Three Months Ended March 31, 2025
Balance at beginning of period	$	(9	)	$	(4	)	$	(13	)
Amounts reclassified from accumulated other comprehensive loss, net of tax		1			—			1
Other comprehensive earnings, net of tax		1			—			1
Balance at end of period	$	(8	)	$	(4	)	$	(12	)

	Three Months Ended March 31, 2024
Balance at beginning of period	$	(48	)	$	(1	)	$	(49	)
Other comprehensive loss before reclassifications, net of tax		—			(1	)		(1	)
Amounts reclassified from accumulated other comprehensive loss, net of tax		1			—			1
Other comprehensive earnings (loss), net of tax		1			(1	)		—
Balance at end of period	$	(47	)	$	(2	)	$	(49	)

Reclassification Out of Accumulated Other Comprehensive Loss

Reclassifications out of accumulated other comprehensive loss are as follows:


	Three Months Ended						Affected line items in the consolidated
	March 31,						statements of earnings
	2025			2024			and comprehensive earnings
	(Dollars in Millions)
Pension and postretirement benefit plans
Amortization of prior service cost	$	2		$	2		Other nonoperating income, net
Tax effect		(1	)		(1	)	Income tax expense
Total	$	1		$	1

Basic and Diluted Earnings from Continuing Operations Per Common Share

The following table reconciles the denominator for basic and diluted earnings per common share:


	Three Months Ended
	March 31,
	2025		2024
	(In Millions)
Basic weighted-average common shares outstanding		60.9		61.8
Effect of dilutive employee and director awards		0.1		0.2
Diluted weighted-average common shares outstanding		61.0		62.0

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Cash Flows from Operating Activities:
Consolidated net earnings	$ 116	$ 1,046
Adjustments to reconcile consolidated net earnings to net cash provided by operating activities:
Depreciation, depletion and amortization	154	130
Stock-based compensation expense	31	15
Loss (Gain) on divestitures and sales of assets	1	(1,333)
Deferred income taxes, net	3	(95)
Noncash asset and portfolio rationalization charge	0	49
Other items, net	(1)	(2)
Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
Accounts receivable, net	(66)	55
Inventories, net	(57)	(85)
Accounts payable	24	15
Other assets and liabilities, net	13	377
Net Cash Provided by Operating Activities	218	172
Cash Flows from Investing Activities:
Additions to property, plant and equipment	(233)	(200)
Acquisitions, net of cash acquired	0	(488)
Proceeds from divestitures and sales of assets	2	2,107
Investments in limited liability company	(20)	0
Other investing activities, net	(11)	6
Net Cash (Used for) Provided by Investing Activities	(262)	1,425
Cash Flows from Financing Activities:
Payments on finance lease obligations	(5)	(5)
Dividends paid	(49)	(46)
Repurchases of common stock	(450)	(150)
Shares withheld for employees' income tax obligations	(21)	(27)
Other financing activities, net	0	(1)
Net Cash Used for Financing Activities	(525)	(229)
Net (Decrease) Increase in Cash and Cash Equivalents	(569)	1,368
Cash, Cash Equivalents and Restricted Cash, beginning of period	670	1,282
Cash, Cash Equivalents and Restricted Cash, end of period	$ 101	$ 2,650

Inventories, Net - Schedule of Inventories Net (Detail) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024
Inventory Disclosure [Abstract]
Finished products	$ 1,394		$ 1,327
Products in process	23		24
Raw materials	90		65
Supplies and expendable parts	159		162
Total inventories	1,666		1,578
Less: allowances	(493)		(463)
Inventories, net	$ 1,173	$ 1,115	$ 1,115

Goodwill (Tables)

3 Months Ended

Mar. 31, 2025

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in Goodwill

The following table shows the changes in goodwill by reportable segment and in total:


	East			West
	Group			Group		Total
	(Dollars in Millions)
Balance at January 1, 2025	$	1,031		$	2,736	$	3,767
Adjustments to purchase price allocations		(1	)		7		6
Balance at March 31, 2025	$	1,030		$	2,743	$	3,773

- Definition

Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule.

+ References

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+ Details

Supplemental Cash Flow Information - Schedule of Noncash Investing and Financing Activities (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Supplemental Cash Flow Elements [Abstract]
Accrued liabilities for purchases of property, plant and equipment	$ 47	$ 35
Right-of-use assets obtained in exchange for new operating lease liabilities	26	17
Right-of-use assets obtained in exchange for new finance lease liabilities	4	5
Remeasurement of operating lease right-of-use assets	(1)	0
Remeasurement of finance lease right-of-use assets	$ 50	$ 0

Significant Accounting Policies

3 Months Ended

Mar. 31, 2025

Accounting Policies [Abstract]

Significant Accounting Policies

Organization

Martin Marietta Materials, Inc. (the Company or Martin Marietta) is a natural resource-based building materials company. As of March 31, 2025, the Company supplies aggregates (crushed stone, sand and gravel) through its network of approximately 390 quarries, mines and distribution yards in 28 states, Canada and The Bahamas. Martin Marietta also provides cement and downstream products and services, namely, ready mixed concrete, asphalt and paving, in vertically-integrated structured markets where the Company also has a leading aggregates position. The Company’s heavy-side building materials are used in infrastructure, nonresidential and residential construction projects. Aggregates are also used in agricultural, utility and environmental applications and as railroad ballast. The aggregates, cement and ready mixed concrete, asphalt and paving product lines are reported collectively as the Building Materials business.

The Company’s Building Materials business includes two reportable segments: East Group and West Group.


BUILDING MATERIALS BUSINESS
Reportable Segments	East Group	West Group
Operating Locations	Alabama, Florida, Georgia, Indiana, Iowa, Kansas, Kentucky, Maryland, Minnesota, Missouri, Nebraska, North Carolina, Ohio, Pennsylvania, South Carolina, Tennessee, Virginia, West Virginia, Nova Scotia and The Bahamas	Arizona, Arkansas, California, Colorado, Louisiana, Oklahoma, Texas, Utah, Washington and Wyoming

Product Lines	Aggregates and Asphalt	Aggregates, Cement and Ready Mixed Concrete, Asphalt and Paving

The Company’s Magnesia Specialties business, which represents a separate reportable segment, has manufacturing facilities in Manistee, Michigan, and Woodville, Ohio. The Magnesia Specialties business produces magnesia-based chemicals products used in industrial, agricultural and environmental applications, and dolomitic lime sold primarily to customers for steel production and soil stabilization.

Basis of Presentation and Use of Estimates

The accompanying unaudited consolidated financial statements of the Company have been prepared in accordance with accounting principles generally accepted in the United States (U.S. GAAP) for interim financial information and with the instructions to the Quarterly Report on Form 10-Q and in Article 10 of Regulation S-X. The Company has continued to follow the accounting policies set forth in the audited consolidated financial statements and related notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2024. In the opinion of management, the interim consolidated financial information provided herein reflects all adjustments, consisting of normal recurring accruals, necessary for a fair statement of the results of operations, financial position and cash flows for the interim periods. The consolidated results of operations for the three months ended March 31, 2025 are not necessarily indicative of the results expected for other interim periods or the full year. The consolidated balance sheet at December 31, 2024 has been derived from the audited consolidated financial statements at that date but does not include all of the information and notes required by U.S. GAAP for complete financial statements. These

consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2024.

The preparation of the Company’s consolidated financial statements requires management to make certain estimates and assumptions about future events. As future events and their effects cannot be fully determined with precision, actual results could differ significantly from estimates. Changes in estimates are reflected in the consolidated financial statements in the period in which the change in estimate occurs.

Consolidated Comprehensive Earnings and Accumulated Other Comprehensive Loss

Consolidated comprehensive earnings consist of consolidated net earnings, adjustments for the funded status of pension and postretirement benefit plans and foreign currency translation adjustments, and are presented in the Company’s consolidated statements of earnings and comprehensive earnings.

Consolidated comprehensive earnings attributable to Martin Marietta are as follows:


	Three Months Ended
	March 31,
	2025		2024
	(Dollars in Millions)
Net earnings attributable to Martin Marietta	$	116	$	1,045
Other comprehensive earnings, net of tax		1		—
Consolidated comprehensive earnings attributable to Martin Marietta	$	117	$	1,045

Accumulated other comprehensive loss consists of unrecognized gains and losses related to the funded status of the pension and postretirement benefit plans and foreign currency translation adjustments and is presented on the Company’s consolidated balance sheets.

The components of the changes in accumulated other comprehensive loss, net of tax, are as follows:


	(Dollars in Millions)
	Pension and Postretirement Benefit Plans			Foreign Currency			Accumulated Other Comprehensive Loss
	Three Months Ended March 31, 2025
Balance at beginning of period	$	(9	)	$	(4	)	$	(13	)
Amounts reclassified from accumulated other comprehensive loss, net of tax		1			—			1
Other comprehensive earnings, net of tax		1			—			1
Balance at end of period	$	(8	)	$	(4	)	$	(12	)

	Three Months Ended March 31, 2024
Balance at beginning of period	$	(48	)	$	(1	)	$	(49	)
Other comprehensive loss before reclassifications, net of tax		—			(1	)		(1	)
Amounts reclassified from accumulated other comprehensive loss, net of tax		1			—			1
Other comprehensive earnings (loss), net of tax		1			(1	)		—
Balance at end of period	$	(47	)	$	(2	)	$	(49	)

Changes in net noncurrent deferred tax assets related to accumulated other comprehensive loss are as follows:


	Pension and Postretirement Benefit Plans
	Three Months Ended
	March 31,
	2025			2024
	(Dollars in Millions)
Balance at beginning of period	$	41		$	54
Tax effect of other comprehensive earnings		(1	)		(1	)
Balance at end of period	$	40		$	53

Reclassifications out of accumulated other comprehensive loss are as follows:


	Three Months Ended						Affected line items in the consolidated
	March 31,						statements of earnings
	2025			2024			and comprehensive earnings
	(Dollars in Millions)
Pension and postretirement benefit plans
Amortization of prior service cost	$	2		$	2		Other nonoperating income, net
Tax effect		(1	)		(1	)	Income tax expense
Total	$	1		$	1

Earnings per Common Share

The numerator for basic and diluted earnings per common share is net earnings attributable to Martin Marietta. The denominator for basic earnings per common share is the weighted-average number of common shares outstanding during the period. Diluted earnings per common share is computed assuming that the weighted-average number of common shares is increased by the conversion, using the treasury stock method, of awards to be issued to employees and nonemployee members of the Company’s Board of Directors under certain stock-based compensation arrangements if the conversion is dilutive.

The following table reconciles the denominator for basic and diluted earnings per common share:


	Three Months Ended
	March 31,
	2025		2024
	(In Millions)
Basic weighted-average common shares outstanding		60.9		61.8
Effect of dilutive employee and director awards		0.1		0.2
Diluted weighted-average common shares outstanding		61.0		62.0

New Accounting Pronouncements

In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, which focuses on the rate reconciliation and income taxes paid. ASU 2023-09 requires public entities to disclose, on an annual basis, a tabular tax rate reconciliation using both percentages and currency amounts, broken out into specified categories. Certain reconciling items are further broken out by nature and jurisdiction to the extent those items exceed a specified threshold. Additionally, all entities are required to disclose income taxes paid, net of refunds received, disaggregated by federal, state/local, and foreign taxes and by individual jurisdiction if the amount is at least 5% of total income tax payments, net of refunds received. The ASU also requires additional qualitative disclosures. ASU 2023-09 is effective prospectively for annual periods beginning after December 15, 2024, and early adoption and retrospective application are permitted. The ASU will impact the Company's income tax disclosures beginning with the financial statements included in the 2025 Annual Report on Form 10-K, but will have no impact on its results of operations, cash flows or financial condition.

In November 2024, the FASB issued ASU 2024-03, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses (DISE), which requires public entities to disaggregate any relevant expense caption presented on the face of the income statement within continuing operations into the following required natural expense categories, as applicable: (1) purchases of inventory, (2) employee compensation, (3) depreciation, (4) intangible asset amortization, and (5) depreciation, depletion and amortization recognized as part of oil- and gas-producing activities or other depletion expenses. These disclosures must be made in a tabular format in the footnotes to the financial statements. The new standard does not change the requirements for the presentation of expenses on the face of the statement of earnings. The ASU is effective prospectively for annual reporting periods beginning after December 15, 2026 and interim reporting periods beginning after December 15, 2027, and early adoption and retrospective application are permitted. The ASU will impact the Company's expense disclosures beginning with the financial statements included in the 2027 Annual Report on Form 10-K, but will have no impact on its results of operations, cash flows or financial condition.

Reclassifications

Certain reclassifications have been made in the Company's financial statements of the prior year to conform to the current-year presentation. The reclassifications had no impact on the Company’s previously reported results of operations, financial condition or cash flows.

Pension Benefits (Tables)

3 Months Ended

Mar. 31, 2025

Pension

Schedule of Components of Net Periodic Benefit Cost

The net periodic benefit cost for pension benefits includes the following components:


	Three Months Ended March 31,
	2025			2024
	(Dollars in Millions)
Service cost	$	9		$	9
Interest cost		15			14
Expected return on assets		(21	)		(20	)
Amortization of prior service cost		2			2
Net periodic benefit cost	$	5		$	5

Inventories, Net (Tables)

3 Months Ended

Mar. 31, 2025

Inventory Disclosure [Abstract]

Schedule of Inventories Net


	March 31,			December 31,
	2025			2024
	(Dollars in Millions)
Finished products	$	1,394		$	1,327
Products in process		23			24
Raw materials		90			65
Supplies and expendable parts		159			162
Total inventories		1,666			1,578
Less: allowances		(493	)		(463	)
Inventories, net	$	1,173		$	1,115

Debt

3 Months Ended

Mar. 31, 2025

Debt Disclosure [Abstract]

Debt


	March 31,			December 31,
	2025			2024
	(Dollars in Millions)
7% Debentures, due 2025		125			125
3.450% Senior Notes, due 2027		299			299
3.500% Senior Notes, due 2027		493			493
2.500% Senior Notes, due 2030		473			472
2.400% Senior Notes, due 2031		890			890
5.150% Senior Notes, due 2034		738			738
6.25% Senior Notes, due 2037		228			228
4.250% Senior Notes, due 2047		591			591
3.200% Senior Notes, due 2051		851			851
5.500% Senior Notes, due 2054		726			726
Total debt		5,414			5,413
Less: current maturities		(125	)		(125	)
Long-term debt	$	5,289		$	5,288

The Company has a credit agreement with JPMorgan Chase Bank, N.A., as Administrative Agent, Deutsche Bank Securities, Inc., PNC Bank, Truist Bank and Wells Fargo Bank, N.A., as Syndication Agents, and the lenders party thereto (the Credit Agreement), which provides for an $800 million five-year senior unsecured revolving facility (the Revolving

Facility) with a maturity date of December 21, 2029. Borrowings under the Revolving Facility bear interest, at the Company’s option, at rates based upon the Secured Overnight Financing Rate (SOFR) or a base rate, plus, for each rate, a margin determined in accordance with a ratings-based pricing grid. Any outstanding principal amounts, together with interest accrued thereon, are due in full on that maturity date. There were no borrowings outstanding under the Revolving Facility as of March 31, 2025 and December 31, 2024. Available borrowings under the Revolving Facility are reduced by any outstanding letters of credit issued by the Company under the Revolving Facility. At March 31, 2025 and December 31, 2024, the Company had $3 million of outstanding letters of credit issued under the Revolving Facility.

The Credit Agreement requires the Company’s ratio of consolidated net debt-to-consolidated earnings before interest, taxes, depreciation, depletion and amortization (EBITDA), as defined, for the trailing-twelve months (the Ratio) to not exceed 3.50x as of the end of any fiscal quarter, provided that the Company may exclude from the Ratio any debt incurred in connection with certain acquisitions during the quarter or three preceding quarters so long as the Ratio calculated without such exclusion does not exceed 4.00x. Additionally, if no amounts are outstanding under the Revolving Facility or the Company's trade receivable securitization facility (discussed below), consolidated debt, as defined, which includes debt for which the Company is a guarantor, shall be reduced in an amount equal to the lesser of $500 million or the sum of the Company’s unrestricted cash and temporary investments, for purposes of the covenant calculation. The Company was in compliance with the Ratio at March 31, 2025.

The Company, through a wholly-owned special-purpose subsidiary, has a $400 million trade receivable securitization facility (the Trade Receivable Facility) that matures on September 17, 2025. The Trade Receivable Facility, with Truist Bank, Regions Bank, First-Citizens Bank & Trust Company, and certain other lenders that may become a party to the facility from time to time, is backed by eligible trade receivables, as defined. Borrowings are limited to the lesser of the facility limit or the borrowing base, as defined. These receivables are originated by the Company and then sold or contributed to the wholly-owned, special-purpose subsidiary. The Company continues to be responsible for the servicing and administration of the receivables purchased by the wholly-owned, special-purpose subsidiary. Borrowings under the Trade Receivable Facility bear interest at a rate equal to the Adjusted Term Secured Overnight Financing Rate (Adjusted Term SOFR), as defined, plus 0.8%. The Trade Receivable Facility contains a cross-default provision to the Company’s other debt agreements. Subject to certain conditions, including lenders providing the requisite commitments, the Trade Receivable Facility may be increased to a borrowing base not to exceed $500 million. There were no borrowings outstanding under the Trade Receivable Facility as of March 31, 2025 and December 31, 2024.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

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+ Details

Goodwill - Changes in Goodwill (Detail) $ in Millions	3 Months Ended
Goodwill - Changes in Goodwill (Detail) $ in Millions	Mar. 31, 2025 USD ($)
Goodwill [Line Items]
Balance at January 1, 2025	$ 3,767
Adjustments to purchase price allocations	6
Balance at March 31, 2025	3,773
East Group
Goodwill [Line Items]
Balance at January 1, 2025	1,031
Adjustments to purchase price allocations	(1)
Balance at March 31, 2025	1,030
West Group
Goodwill [Line Items]
Balance at January 1, 2025	2,736
Adjustments to purchase price allocations	7
Balance at March 31, 2025	$ 2,743

- Definition

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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+ Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

Segments - Financial Data for Continuing Operations for Company's Reportable Business Segments (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Segment Reporting Information [Line Items]
Assets employed	$ 17,724		$ 18,170
Total property additions, including the impact of acquisitions	136	$ 578
Property additions through acquisitions	0	471
Reportable Segments
Segment Reporting Information [Line Items]
Assets employed	16,789		16,662
Total property additions, including the impact of acquisitions	132	575
Property additions through acquisitions	0	471
Operating Segments \| East Group
Segment Reporting Information [Line Items]
Assets employed	8,593		8,452
Total property additions, including the impact of acquisitions	67	47
Property additions through acquisitions	0	0
Operating Segments \| West Group
Segment Reporting Information [Line Items]
Assets employed	7,913		7,941
Total property additions, including the impact of acquisitions	62	523
Property additions through acquisitions	0	471
Operating Segments \| Magnesia Specialties
Segment Reporting Information [Line Items]
Assets employed	283		269
Total property additions, including the impact of acquisitions	3	5
Corporate
Segment Reporting Information [Line Items]
Assets employed	935		$ 1,508
Total property additions, including the impact of acquisitions	4	3
Property additions through acquisitions	$ 0	$ 0

Consolidated Statements of Total Equity (Unaudited) - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Retained Earnings	Total Shareholders' Equity	Noncontrolling Interests
Beginning Balance at Dec. 31, 2023	$ 8,036	$ 1	$ 3,519	$ (49)	$ 4,563	$ 8,034	$ 2
Beginning Balance (in shares) at Dec. 31, 2023		61,821,421
Consolidated net earnings	1,046				1,045	1,045	1
Dividends declared	(46)				(46)	(46)
Issuances of common stock for stock award plans	5		5			5
Issuances of common stock for stock award plans (in shares)		74,145
Shares withheld for employees' income tax obligations	(27)		(27)			(27)
Repurchases of common stock	(151)				(151)	(151)
Repurchases of common stock, Shares		(255,601)
Stock-based compensation expense	15		15			15
Distributions to owners of noncontrolling interest	(1)						(1)
Ending Balance at Mar. 31, 2024	8,877	$ 1	3,512	(49)	5,411	8,875	2
Ending Balance (in shares) at Mar. 31, 2024		61,639,965
Beginning Balance at Dec. 31, 2024	$ 9,456	$ 1	3,550	(13)	5,915	9,453	3
Beginning Balance (in shares) at Dec. 31, 2024	61,126,646	61,126,646
Consolidated net earnings	$ 116				116	116	0
Other comprehensive earnings, net of tax	1			1		1
Dividends declared	(48)				(48)	(48)
Issuances of common stock for stock award plans	3		3			3
Issuances of common stock for stock award plans (in shares)		62,975
Shares withheld for employees' income tax obligations	(21)		(21)			(21)
Repurchases of common stock	(454)				(454)	(454)
Repurchases of common stock, Shares		(910,831)
Stock-based compensation expense	31		31			31
Ending Balance at Mar. 31, 2025	$ 9,084	$ 1	$ 3,563	$ (12)	$ 5,529	$ 9,081	$ 3
Ending Balance (in shares) at Mar. 31, 2025	60,278,790	60,278,790

Segments

3 Months Ended

Mar. 31, 2025

Segment Reporting [Abstract]

Segments

10.

Segments

The Building Materials business is comprised of four divisions that represent individual operating segments. These operating segments are consolidated into two reportable segments, the East Group and the West Group, for financial reporting purposes, as they meet the aggregation criteria. The Magnesia Specialties business represents an individual operating and reportable segment.

The Company’s Chief Operating Decision Maker (CODM) is the Chair, President and Chief Executive Officer. The CODM reviews results by reportable segment on a quarterly basis and allocates resources to achieve the Company’s strategic objectives based on an evaluation of each reportable segment’s performance. This evaluation is largely based on segment earnings from operations, as management believes this is the best metric of segment profitability and operating performance. Segment earnings from operations is also a measure in the determination of incentive compensation targets and awards. Segment earnings from operations include revenues less cost of revenues; selling, general and administrative expenses; other operating income and expenses, net; and exclude interest income and expense; other nonoperating income and expenses, net; and income tax expense.

The significant expense categories shown below align with the segment-level information regularly provided to the CODM. Other costs of revenues for each reportable segment include mainly repairs and maintenance, contract services, supplies and royalties.

Corporate loss from operations primarily includes depreciation and amortization; expenses for corporate administrative functions; acquisition, divestiture and integration expenses; and other nonrecurring income and expenses not attributable to operations of the Company's operating segments.

The following tables display selected financial data for the Company’s reportable segments. Revenues, as presented on the consolidated statements of earnings and comprehensive earnings, reflect the elimination of intersegment revenues, which represent sales from one segment to another segment and are immaterial. Income tax expense is not allocated to the Company's reportable segments.

Earnings from operations for the West Group for the three months ended March 31, 2024 included a $1.3 billion gain and $16 million in transaction expenses on the divestiture of the South Texas cement business and certain of its related ready mixed concrete operations (see Note 2) and a noncash asset and portfolio rationalization charge of $49 million (see Note 13).


	Three Months Ended March 31, 2025
	(Dollars in Millions)
	East Group		West Group		Magnesia Specialties		Total Reportable Segments		Corporate			Total
Segment Revenues	$	599	$	667	$	87	$	1,353	$	—		$	1,353
Less:
Labor and benefits expense		92		95		11		198		—			198
Raw materials expense		1		76		5		82		—			82
Depreciation, depletion and amortization expense		72		67		4		143		1			144
Energy expense		31		32		9		72		—			72
External freight expense		20		51		7		78		—			78
Other costs of revenues		189		242		13		444		—			444
Selling, general and administrative expenses		42		51		5		98		32			130
Acquisition, divestiture and integration expenses		—		—		—		—		2			2
Other operating expense, net		—		4		—		4		5			9
Segment Earnings (Loss) from Operations	$	152	$	49	$	33	$	234	$	(40	)	$	194
Interest expense													56
Other nonoperating income, net													(10	)
Consolidated earnings before income tax expense												$	148


	Three Months Ended March 31, 2024
	(Dollars in Millions)
	East Group			West Group			Magnesia Specialties		Total Reportable Segments			Corporate			Total
Segment Revenues	$	526		$	644		$	81	$	1,251		$	—		$	1,251
Less:
Labor and benefits expense		88			99			10		197			—			197
Raw materials expense		—			80			4		84			—			84
Depreciation, depletion and amortization expense		50			63			3		116			1			117
Energy expense		31			34			9		74			—			74
External freight expense		20			44			8		72			—			72
Other costs of revenues		177			236			18		431			4			435
Selling, general and administrative expenses		34			48			5		87			31			118
Acquisition, divestiture and integration expenses		—			16			—		16			4			20
Other operating income, net		(2	)		(1,275	)		—		(1,277	)		(10	)		(1,287	)
Segment Earnings (Loss) from Operations	$	128		$	1,299		$	24	$	1,451		$	(30	)	$	1,421
Interest expense																40
Other nonoperating income, net																(33	)
Consolidated earnings before income tax expense															$	1,414

Assets employed by segment include assets directly identified with those operations. Corporate assets consist primarily of cash and cash equivalents; property, plant and equipment for corporate operations; and other assets not directly identifiable with a reportable segment.


	March 31,		December 31,
	2025		2024
Assets employed:	(Dollars in Millions)
East Group	$	8,593	$	8,452
West Group		7,913		7,941
Magnesia Specialties		283		269
Total reportable segments		16,789		16,662
Corporate		935		1,508
Total	$	17,724	$	18,170


	Three Months Ended
	March 31,
	2025		2024
Total property additions, including the impact of acquisitions:	(Dollars in Millions)
East Group	$	67	$	47
West Group		62		523
Magnesia Specialties		3		5
Total reportable segments		132		575
Corporate		4		3
Total	$	136	$	578


	Three Months Ended
	March 31,
	2025		2024
Property additions through acquisitions:	(Dollars in Millions)
East Group	$	—	$	—
West Group		—		471
Total reportable segments		—		471
Corporate		—		—
Total	$	—	$	471

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

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+ Details

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Current Assets:
Cash and cash equivalents	$ 101	$ 670
Accounts receivable, net	733	678
Inventories, net	1,173	1,115
Other current assets	96	79
Total Current Assets	2,103	2,542
Property, plant and equipment	15,187	15,086
Allowances for depreciation, depletion and amortization	(5,092)	(4,977)
Net property, plant and equipment	10,095	10,109
Goodwill	3,773	3,767
Other intangibles, net	721	730
Operating lease right-of-use assets, net	379	376
Other noncurrent assets	653	646
Total Assets	17,724	18,170
Current Liabilities:
Accounts payable	298	375
Accrued salaries, benefits and payroll taxes	41	73
Accrued income taxes	125	102
Accrued other taxes	50	50
Accrued interest	69	45
Current maturities of long-term debt	125	125
Current operating lease liabilities	59	56
Other current liabilities	168	190
Total Current Liabilities	935	1,016
Long-term debt	5,289	5,288
Deferred income taxes, net	1,172	1,169
Noncurrent operating lease liabilities	334	335
Noncurrent asset retirement obligations	373	423
Other noncurrent liabilities	537	483
Total Liabilities	8,640	8,714
Commitments and contingent liabilities - Note 9	0	0
Equity:
Common stock, par value $0.01 per share (60,278,790 shares and 61,126,646 shares outstanding at March 31, 2025 and December 31, 2024, respectively)	1	1
Preferred stock, par value $0.01 per share	0	0
Additional paid-in capital	3,563	3,550
Accumulated other comprehensive loss	(12)	(13)
Retained earnings	5,529	5,915
Total Shareholders' Equity	9,081	9,453
Noncontrolling interests	3	3
Total Equity	9,084	9,456
Total Liabilities and Equity	$ 17,724	$ 18,170

Significant Accounting Policies - Changes in Accumulated Other Comprehensive Loss Net of Tax (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 9,456	$ 8,036
Other comprehensive earnings (loss), net of tax	1	0
Ending Balance	9,084	8,877
Pension and Postretirement Benefit Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(9)	(48)
Other comprehensive loss before reclassifications, net of tax		0
Amounts reclassified from accumulated other comprehensive loss, net of tax	1	1
Other comprehensive earnings (loss), net of tax	1	1
Ending Balance	(8)	(47)
Foreign Currency
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(4)	(1)
Other comprehensive loss before reclassifications, net of tax		(1)
Amounts reclassified from accumulated other comprehensive loss, net of tax	0	0
Other comprehensive earnings (loss), net of tax	0	(1)
Ending Balance	(4)	(2)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(13)	(49)
Other comprehensive loss before reclassifications, net of tax		(1)
Amounts reclassified from accumulated other comprehensive loss, net of tax	1	1
Other comprehensive earnings (loss), net of tax	1	0
Ending Balance	$ (12)	$ (49)

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References + Details

- Definition

Amount after tax, before reclassification adjustments of other comprehensive income (loss).

+ References + Details

- Definition

Amount after tax of reclassification adjustments of other comprehensive income (loss).

+ References + Details

- Definition

Amount of equity (deficit) attributable to parent and noncontrolling interest. Excludes temporary equity.

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Reference 24: http://www.xbrl.org/2003/role/disclosureRef
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Reference 49: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476166/350-60-65-1

+ Details

Commitments and Contingencies - Additional Information (Detail) $ in Millions	Mar. 31, 2025 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Outstanding letters of credit	$ 37

Consolidated Statements of Total Equity (Parenthetical) (Unaudited) - $ / shares	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Statement of Stockholders' Equity [Abstract]
Dividends declared	$ 0.79	$ 0.74

Segments - Schedule of Consolidated Earnings from Continuing Operations Before Income Tax Expense (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting Information [Line Items]
Segment Revenues	$ 1,353	$ 1,251
Labor and benefits expense	198	197
Raw materials expense	82	84
Depreciation, depletion and amortization expense	144	117
Energy expense	72	74
External freight expense	78	72
Other costs of revenues	444	435
Selling, general and administrative expenses	130	118
Acquisition, divestiture and integration expenses	2	20
Other operating expense (income), net	9	(1,287)
Segment Earnings (Loss) from Operations	194	1,421
Interest expense	56	40
Other nonoperating income, net	(10)	(33)
Earnings before income tax expense	148	1,414
Operating Segments \| East Group
Segment Reporting Information [Line Items]
Segment Revenues	599	526
Labor and benefits expense	92	88
Raw materials expense	1	0
Depreciation, depletion and amortization expense	72	50
Energy expense	31	31
External freight expense	20	20
Other costs of revenues	189	177
Selling, general and administrative expenses	42	34
Acquisition, divestiture and integration expenses	0	0
Other operating expense (income), net	0	(2)
Segment Earnings (Loss) from Operations	152	128
Operating Segments \| West Group
Segment Reporting Information [Line Items]
Segment Revenues	667	644
Labor and benefits expense	95	99
Raw materials expense	76	80
Depreciation, depletion and amortization expense	67	63
Energy expense	32	34
External freight expense	51	44
Other costs of revenues	242	236
Selling, general and administrative expenses	51	48
Acquisition, divestiture and integration expenses	0	16
Other operating expense (income), net	4	(1,275)
Segment Earnings (Loss) from Operations	49	1,299
Operating Segments \| Magnesia Specialties
Segment Reporting Information [Line Items]
Segment Revenues	87	81
Labor and benefits expense	11	10
Raw materials expense	5	4
Depreciation, depletion and amortization expense	4	3
Energy expense	9	9
External freight expense	7	8
Other costs of revenues	13	18
Selling, general and administrative expenses	5	5
Acquisition, divestiture and integration expenses	0	0
Other operating expense (income), net	0	0
Segment Earnings (Loss) from Operations	33	24
Operating Segments \| Reportable Segments
Segment Reporting Information [Line Items]
Segment Revenues	1,353	1,251
Labor and benefits expense	198	197
Raw materials expense	82	84
Depreciation, depletion and amortization expense	143	116
Energy expense	72	74
External freight expense	78	72
Other costs of revenues	444	431
Selling, general and administrative expenses	98	87
Acquisition, divestiture and integration expenses	0	16
Other operating expense (income), net	4	(1,277)
Segment Earnings (Loss) from Operations	234	1,451
Corporate
Segment Reporting Information [Line Items]
Segment Revenues	0	0
Labor and benefits expense	0	0
Raw materials expense	0	0
Depreciation, depletion and amortization expense	1	1
Energy expense	0	0
External freight expense	0	0
Other costs of revenues	0	4
Selling, general and administrative expenses	32	31
Acquisition, divestiture and integration expenses	2	4
Other operating expense (income), net	5	(10)
Segment Earnings (Loss) from Operations	$ (40)	$ (30)

Business Combinations and Divestitures - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Millions

Mar. 31, 2025

Dec. 31, 2024

Apr. 05, 2024

Liabilities:

Goodwill

$ 3,773

$ 3,767

Blue Water Industries LLC

Assets:

Inventories

$ 47

Property, plant and equipment

^[1]

2,052

Intangible assets, other than goodwill

Other assets

Total Assets

2,120

Liabilities:

Deferred income taxes

234

Asset retirement obligations

Other liabilities

Total liabilities

332

Net identifiable assets acquired

1,788

Goodwill

262

Total consideration

$ 2,050

[1]	Includes mineral reserves of $1.9 billion.

Segments (Tables)

3 Months Ended

Mar. 31, 2025

Segment Reporting [Abstract]

Financial Data for Continuing Operation for Company's Reportable Business Segments


	Three Months Ended March 31, 2025
	(Dollars in Millions)
	East Group		West Group		Magnesia Specialties		Total Reportable Segments		Corporate			Total
Segment Revenues	$	599	$	667	$	87	$	1,353	$	—		$	1,353
Less:
Labor and benefits expense		92		95		11		198		—			198
Raw materials expense		1		76		5		82		—			82
Depreciation, depletion and amortization expense		72		67		4		143		1			144
Energy expense		31		32		9		72		—			72
External freight expense		20		51		7		78		—			78
Other costs of revenues		189		242		13		444		—			444
Selling, general and administrative expenses		42		51		5		98		32			130
Acquisition, divestiture and integration expenses		—		—		—		—		2			2
Other operating expense, net		—		4		—		4		5			9
Segment Earnings (Loss) from Operations	$	152	$	49	$	33	$	234	$	(40	)	$	194
Interest expense													56
Other nonoperating income, net													(10	)
Consolidated earnings before income tax expense												$	148


	Three Months Ended March 31, 2024
	(Dollars in Millions)
	East Group			West Group			Magnesia Specialties		Total Reportable Segments			Corporate			Total
Segment Revenues	$	526		$	644		$	81	$	1,251		$	—		$	1,251
Less:
Labor and benefits expense		88			99			10		197			—			197
Raw materials expense		—			80			4		84			—			84
Depreciation, depletion and amortization expense		50			63			3		116			1			117
Energy expense		31			34			9		74			—			74
External freight expense		20			44			8		72			—			72
Other costs of revenues		177			236			18		431			4			435
Selling, general and administrative expenses		34			48			5		87			31			118
Acquisition, divestiture and integration expenses		—			16			—		16			4			20
Other operating income, net		(2	)		(1,275	)		—		(1,277	)		(10	)		(1,287	)
Segment Earnings (Loss) from Operations	$	128		$	1,299		$	24	$	1,451		$	(30	)	$	1,421
Interest expense																40
Other nonoperating income, net																(33	)
Consolidated earnings before income tax expense															$	1,414


	March 31,		December 31,
	2025		2024
Assets employed:	(Dollars in Millions)
East Group	$	8,593	$	8,452
West Group		7,913		7,941
Magnesia Specialties		283		269
Total reportable segments		16,789		16,662
Corporate		935		1,508
Total	$	17,724	$	18,170


	Three Months Ended
	March 31,
	2025		2024
Total property additions, including the impact of acquisitions:	(Dollars in Millions)
East Group	$	67	$	47
West Group		62		523
Magnesia Specialties		3		5
Total reportable segments		132		575
Corporate		4		3
Total	$	136	$	578


	Three Months Ended
	March 31,
	2025		2024
Property additions through acquisitions:	(Dollars in Millions)
East Group	$	—	$	—
West Group		—		471
Total reportable segments		—		471
Corporate		—		—
Total	$	—	$	471

Commitments and Contingencies

3 Months Ended

Mar. 31, 2025

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Legal and Administrative Proceedings

The Company is engaged in certain legal and administrative proceedings incidental to its normal business activities, including proceedings relating to environmental matters. The Company considers various factors in assessing the probable outcome of each matter, including but not limited to the nature of existing legal proceedings and claims, the

asserted or possible damages, the jurisdiction and venue of the case and whether it is a jury trial, the progress of the case, existing law and precedent, the opinions or views of legal counsel and other advisers, the Company’s experience in similar cases and the experience of other companies, the facts available to the Company at the time of assessment, and how the Company intends to respond to the proceeding or claim. The Company’s assessment of these factors may change over time as proceedings or claims progress. The Company believes the probability is remote that the outcome of any currently pending legal or administrative proceeding will result in a material loss to the Company's financial condition, results of operations or cash flows, as a whole, based on currently available facts.

Letters of Credit

In the normal course of business, the Company provides certain third parties with standby letter of credit agreements guaranteeing its payment for certain insurance claims, contract performance and permit requirements. At March 31, 2025, the Company was contingently liable for $37 million in letters of credit.

Pension Benefits

3 Months Ended

Mar. 31, 2025

Retirement Benefits [Abstract]

Pension Benefits

The net periodic benefit cost for pension benefits includes the following components:


	Three Months Ended March 31,
	2025			2024
	(Dollars in Millions)
Service cost	$	9		$	9
Interest cost		15			14
Expected return on assets		(21	)		(20	)
Amortization of prior service cost		2			2
Net periodic benefit cost	$	5		$	5

The components of net periodic benefit cost, other than service cost, are included in the line item Other nonoperating income, net, in the consolidated statements of earnings and comprehensive earnings. Based on the roles of the employees, service cost is included in the Cost of revenues or Selling, general and administrative expenses line items in the consolidated statements of earnings and comprehensive earnings.

- Definition

The entire disclosure for retirement benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 70
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480794/715-70-50-1

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480482/715-20-55-17

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(03)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (q)
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-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-Name Accounting Standards Codification
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-URI https://asc.fasb.org/715/tableOfContent

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
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-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(iii)
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-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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Reference 12: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
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-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480126/715-20-S99-2

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480266/715-60-50-3

+ Details

Consolidated Statements of Earnings and Comprehensive Earnings (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Income Statement [Abstract]
Revenues	$ 1,353	$ 1,251
Cost of revenues	1,018	979
Gross Profit	335	272
Selling, general and administrative expenses	130	118
Acquisition, divestiture and integration expenses	2	20
Other operating expense (income), net	9	(1,287)
Earnings from Operations	194	1,421
Interest expense	56	40
Other nonoperating income, net	(10)	(33)
Earnings before income tax expense	148	1,414
Income tax expense	32	368
Consolidated net earnings	116	1,046
Less: Net earnings attributable to noncontrolling interests	0	1
Net Earnings Attributable to Martin Marietta	116	1,045
Consolidated Comprehensive Earnings:
Consolidated comprehensive earnings attributable to Martin Marietta	117	1,045
Comprehensive earnings attributable to noncontrolling interests	0	1
Consolidated comprehensive earnings	$ 117	$ 1,046
Net Earnings Attributable to Martin Marietta Per Common Share:
Basic attributable to common shareholders	$ 1.91	$ 16.92
Diluted attributable to common shareholders	$ 1.9	$ 16.87
Weighted-Average Common Shares Outstanding:
Basic	60.9	61.8
Diluted	61.0	62.0

Pension Benefits - Schedule of Components of Net Periodic Benefit Cost (Detail) - Pension - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 9	$ 9
Interest cost	15	14
Expected return on assets	(21)	(20)
Amortization of prior service cost	2	2
Net periodic benefit cost	$ 5	$ 5

Supplemental Cash Flow Information - Supplemental Disclosures of Cash Flow Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Supplemental Cash Flow Elements [Abstract]
Cash paid for interest, net of capitalized amount	$ 31	$ 39
Cash paid for income taxes, net of refunds	$ 1	$ 3

Other Operating (Expense) Income, Net - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Property, Plant and Equipment [Line Items]
Gain on sale of investment		$ 1,300
Noncash asset and portfolio rationalization charge	$ 0	49
South Texas Cement Business
Property, Plant and Equipment [Line Items]
Gain on sale of investment		1,300
Noncash asset and portfolio rationalization charge		$ 49

Pay vs Performance Disclosure - USD ($) $ in Millions	3 Months Ended
Pay vs Performance Disclosure - USD ($) $ in Millions	Mar. 31, 2025	Mar. 31, 2024
Pay vs Performance Disclosure
Net Income (Loss)	$ 116	$ 1,045

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

Business Combinations and Divestitures (Tables)

3 Months Ended

Mar. 31, 2025

Business Combinations [Abstract]

Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed

The following is a summary of the preliminary estimated fair values of the assets acquired and liabilities assumed as of April 5, 2024 (dollars in millions):


Assets:
Inventories	$	47
Property, plant and equipment 1		2,052
Intangible assets, other than goodwill		19
Other assets		2
Total assets		2,120
Liabilities:
Deferred income taxes		234
Asset retirement obligations		3
Other liabilities		95
Total liabilities		332
Net identifiable assets acquired		1,788
Goodwill		262
Total consideration	$	2,050

1 Includes mineral reserves of $1.9 billion.

Financial Instruments

3 Months Ended

Mar. 31, 2025

Financial Instruments Disclosure [Abstract]

Financial Instruments

The Company’s financial instruments include temporary cash investments, accounts receivable, accounts payable, publicly-registered long-term notes and debentures.

Temporary cash investments are placed primarily in money market funds, money market demand deposit accounts and Eurodollar time deposit accounts with financial institutions. The Company’s cash equivalents have maturities of less than three months. Due to the short maturity of these investments, they are carried on the consolidated balance sheets at cost, which approximates fair value.

Accounts receivable are due from a large number of customers, primarily in the construction industry, and are dispersed across wide geographic and economic regions. However, accounts receivable are more heavily concentrated in certain states, namely Texas, North Carolina, Colorado, California, Georgia, Florida, Minnesota, Arizona, South Carolina, and Iowa. The carrying values of accounts receivable approximate their fair values.

Accounts payable represent amounts owed to suppliers and vendors. The estimated carrying value of accounts payable approximates its fair value due to the short-term nature of the payables.

The carrying value and fair value of the Company’s debt were $5.4 billion and $4.9 billion, respectively, at March 31, 2025 and $5.4 billion and $4.8 billion, respectively, at December 31, 2024. The estimated fair value of the Company’s publicly-registered long-term debt was estimated based on Level 1 of the fair value hierarchy using quoted market prices.

Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2025

Accounting Policies [Abstract]

Consolidated Comprehensive Earnings and Accumulated Other Comprehensive Loss

Consolidated comprehensive earnings attributable to Martin Marietta are as follows:


	Three Months Ended
	March 31,
	2025		2024
	(Dollars in Millions)
Net earnings attributable to Martin Marietta	$	116	$	1,045
Other comprehensive earnings, net of tax		1		—
Consolidated comprehensive earnings attributable to Martin Marietta	$	117	$	1,045

The components of the changes in accumulated other comprehensive loss, net of tax, are as follows:


	(Dollars in Millions)
	Pension and Postretirement Benefit Plans			Foreign Currency			Accumulated Other Comprehensive Loss
	Three Months Ended March 31, 2025
Balance at beginning of period	$	(9	)	$	(4	)	$	(13	)
Amounts reclassified from accumulated other comprehensive loss, net of tax		1			—			1
Other comprehensive earnings, net of tax		1			—			1
Balance at end of period	$	(8	)	$	(4	)	$	(12	)

	Three Months Ended March 31, 2024
Balance at beginning of period	$	(48	)	$	(1	)	$	(49	)
Other comprehensive loss before reclassifications, net of tax		—			(1	)		(1	)
Amounts reclassified from accumulated other comprehensive loss, net of tax		1			—			1
Other comprehensive earnings (loss), net of tax		1			(1	)		—
Balance at end of period	$	(47	)	$	(2	)	$	(49	)

Changes in net noncurrent deferred tax assets related to accumulated other comprehensive loss are as follows:


	Pension and Postretirement Benefit Plans
	Three Months Ended
	March 31,
	2025			2024
	(Dollars in Millions)
Balance at beginning of period	$	41		$	54
Tax effect of other comprehensive earnings		(1	)		(1	)
Balance at end of period	$	40		$	53

Reclassifications out of accumulated other comprehensive loss are as follows:


	Three Months Ended						Affected line items in the consolidated
	March 31,						statements of earnings
	2025			2024			and comprehensive earnings
	(Dollars in Millions)
Pension and postretirement benefit plans
Amortization of prior service cost	$	2		$	2		Other nonoperating income, net
Tax effect		(1	)		(1	)	Income tax expense
Total	$	1		$	1

Earnings per Common Share

The following table reconciles the denominator for basic and diluted earnings per common share:


	Three Months Ended
	March 31,
	2025		2024
	(In Millions)
Basic weighted-average common shares outstanding		60.9		61.8
Effect of dilutive employee and director awards		0.1		0.2
Diluted weighted-average common shares outstanding		61.0		62.0

New Accounting Pronouncements

Reclassifications

Segments - Additional Information (Detail) $ in Millions	3 Months Ended
Segments - Additional Information (Detail) $ in Millions	Mar. 31, 2025 USD ($) Segment	Mar. 31, 2024 USD ($)
Segment Reporting Information [Line Items]
Number of divisions represent operating segments \| Segment	4
Reportable business segments \| Segment	2
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration]	Chair, President And Chief Executive Officer [Member]
Segment Reporting, CODM, Profit (Loss) Measure, How Used, Description	Segment earnings from operations include revenues less cost of revenues; selling, general and administrative expenses; other operating income and expenses, net; and exclude interest income and expense; other nonoperating income and expenses, net; and income tax expense. The significant expense categories shown below align with the segment-level information regularly provided to the CODM.
Gain on sale of investment		$ 1,300
Noncash asset and portfolio rationalization charge	$ 0	$ 49
West Group [Member]
Segment Reporting Information [Line Items]
Gain on sale of investment	1,300
Transaction expenses	16
Noncash asset and portfolio rationalization charge	$ 49