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Significant Accounting Policies - Comprehensive Earnings Attributable to Martin Marietta Materials Incorporated (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 414	$ 363	$ 858	$ 1,701
Other comprehensive earnings, net of tax	4	2	8	3
Consolidated comprehensive earnings attributable to Martin Marietta	$ 418	$ 365	$ 866	$ 1,704

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