Business Combinations and Divestitures - Summary of Unaudited Pro Forma Financial Information (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2024	Jun. 30, 2024
Business Combination [Abstract]
Revenues	$ 1,764	$ 3,067
Net earnings from continuing operations attributable to Martin Marietta	$ 324	$ 1,373

Amount of pro forma revenue of combined entity as if acquisition date of business combination occurred as of beginning of period.

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