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Business Combinations, Divestitures, Discontinued Operations and Assets and Liabilities Held for Sale - Summary of Unaudited Pro Forma Financial Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Business Combinations [Abstract] |  |  |  |
Revenues | $ 1,889 | $ 2,059 | $ 4,957 | $ 5,335
Net earnings from continuing operations attributable to Martin Marietta | $ 363 | $ 415 | $ 1,733 | $ 834

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