Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2024

Significant Accounting Policies [Line Items]

Reconciliation of Cash, Cash Equivalents and Restricted Cash

The following table reconciles cash, cash equivalents and restricted cash as reported on the consolidated balance sheets to the aggregated amounts presented on the consolidated statements of cash flows:

	March 31,		December 31,
	2024		2023
	(Dollars in Millions)
Cash and cash equivalents	$	2,648	$	1,272
Restricted cash		2		10
Total cash, cash equivalents and restricted cash    presented in the consolidated statements of cash flows	$	2,650	$	1,282

Consolidated Comprehensive Earnings

Consolidated comprehensive earnings attributable to Martin Marietta are as follows:

	Three Months Ended
	March 31,
	2024		2023
	(Dollars in Millions)
Net earnings attributable to Martin Marietta	$	1,045	$	121
Other comprehensive earnings, net of tax		—		1
Consolidated comprehensive earnings    attributable to Martin Marietta	$	1,045	$	122

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, 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	)
	Three Months Ended March 31, 2023
Balance at beginning of period	$	(36	)	$	(2	)	$	(38	)
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	$	(35	)	$	(2	)	$	(37	)

Noncurrent Deferred Tax Assets Recorded In Accumulated Other Comprehensive Loss

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,
	2024			2023
	(Dollars in Millions)
Balance at beginning of period	$	54		$	50
Tax effect of other comprehensive    earnings		(1	)		—
Balance at end of period	$	53		$	50

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
	2024			2023		and comprehensive earnings
	(Dollars in Millions)
Pension and postretirement    benefit plans
Amortization of prior service cost		2			1	Other nonoperating income, net
Tax effect		(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 from continuing operations per common share:

	Three Months Ended
	March 31,
	2024		2023
	(In Millions)
Basic weighted-average common shares outstanding		61.8		62.1
Effect of dilutive employee and director awards		0.2		0.1
Diluted weighted-average common shares outstanding		62.0		62.2