Consolidated Statements of Earnings and Comprehensive Earnings (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Income Statement [Abstract]
Revenues	$ 1,811	$ 1,764	$ 3,164	$ 3,015
Cost of revenues	1,267	1,247	2,285	2,225
Gross Profit	544	517	879	790
Selling, general and administrative expenses	109	117	239	236
Acquisition, divestiture and integration expenses	2	21	4	41
Other operating income, net	(25)	(19)	(16)	(1,306)
Earnings from Operations	458	398	652	1,819
Interest expense	57	40	114	80
Other nonoperating income, net	(10)	(14)	(20)	(46)
Earnings before income tax expense	411	372	558	1,785
Income tax expense	83	78	114	445
Consolidated net earnings	328	294	444	1,340
Less: Net earnings attributable to noncontrolling interests	0	0	0	1
Net Earnings Attributable to Martin Marietta	328	294	444	1,339
Consolidated Comprehensive Earnings:
Consolidated comprehensive earnings attributable to Martin Marietta	331	295	448	1,340
Comprehensive earnings attributable to noncontrolling interests	0	0	0	1
Consolidated comprehensive earnings	$ 331	$ 295	$ 448	$ 1,341
Net Earnings Attributable to Martin Marietta Per Common Share:
Basic attributable to common shareholders	$ 5.44	$ 4.77	$ 7.33	$ 21.72
Diluted attributable to common shareholders	$ 5.43	$ 4.76	$ 7.31	$ 21.66
Weighted-Average Common Shares Outstanding:
Basic	60.3	61.5	60.6	61.6
Diluted	60.4	61.6	60.7	61.8