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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, 2024
Business Combination [Abstract]
Revenues	$ 1,889	$ 4,957
Net earnings from continuing operations attributable to Martin Marietta	$ 363	$ 1,733

X

- Definition

Amount, after tax, of pro forma income (loss) from continuing operations of combined entity as if acquisition date of business combination occurred as of beginning of period.

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