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Consolidated Statements of Earnings and Comprehensive Earnings (Unaudited) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Income Statement [Abstract]        
Revenues $ 1,846 $ 1,642 $ 4,617 $ 4,250
Cost of revenues 1,235 1,129 3,195 3,039
Gross Profit 611 513 1,422 1,211
Selling, general and administrative expenses 110 101 340 328
Acquisition, divestiture and integration expenses 5 3 9 44
Other operating (income) expense, net (9) 3 (23) (1,301)
Earnings from Operations 505 406 1,096 2,140
Interest expense 59 38 172 118
Other nonoperating income, net (4) (6) (23) (51)
Earnings from continuing operations before income tax expense 450 374 947 2,073
Income tax expense 89 77 190 504
Earnings from continuing operations 361 297 757 1,569
Earnings from discontinued operations, net of income tax expense 53 66 101 133
Consolidated net earnings 414 363 858 1,702
Less: Net earnings attributable to noncontrolling interests 0 0 0 1
Net Earnings Attributable to Martin Marietta 414 363 858 1,701
Consolidated Comprehensive Earnings:        
Consolidated comprehensive earnings attributable to Martin Marietta 418 365 866 1,704
Comprehensive earnings attributable to noncontrolling interests 0 0 0 1
Consolidated comprehensive earnings $ 418 $ 365 $ 866 $ 1,705
Net Earnings Attributable to Martin Marietta Per Common Share:        
Basic from continuing operations attributable to common shareholders $ 5.98 $ 4.86 $ 12.51 $ 25.52
Basic from discontinued operations attributable to common shareholders 0.88 1.07 1.67 2.16
Total basic attributable to common shareholders 6.86 5.93 14.18 27.68
Diluted from continuing operations attributable to common shareholders 5.97 4.84 12.49 25.44
Diluted from discontinued operations attributable to common shareholders 0.88 1.07 1.66 2.16
Total diluted attributable to common shareholders $ 6.85 $ 5.91 $ 14.15 $ 27.6
Weighted-Average Common Shares Outstanding:        
Basic 60.3 61.1 60.5 61.5
Diluted 60.4 61.3 60.6 61.6