Revenues and Gross Profit - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Revenue Recognition [Line Items]
Gross profit	$ 599	$ 676	$ 1,388	$ 1,539
Performance obligations, description of timing			Performance obligations within paving service agreements are satisfied over time, primarily ranging from one day to two years. Customer payments for the paving operations are based on a contractual billing schedule and are typically "paid-when-paid", meaning the Company is paid once the customer is paid.
Future revenues from unsatisfied performance obligations	322	268	$ 322	268
Service revenues	1,889	1,994	4,905	5,169
Revenue recognized from contract liabilities	7	5	9	10
Retainage on contracts	15		15		$ 17
Interproduct Revenues
Revenue Recognition [Line Items]
Service revenues	(82)	(80)	(184)	(184)
West Group | Operating Segments
Revenue Recognition [Line Items]
Service revenues	958	1,104	2,464	2,851
Service
Revenue Recognition [Line Items]
Service revenues			$ 307	307
Service | CALIFORNIA and COLORADO | West Group
Revenue Recognition [Line Items]
Service revenues	$ 164	173
Cement | Operating Segments
Revenue Recognition [Line Items]
Gross profit		109		249
Service revenues		199		565
Ready Mixed Concrete | Operating Segments
Revenue Recognition [Line Items]
Gross profit		34		80
Service revenues		285		777
Ready Mixed Concrete | Operating Segments | Interproduct Revenues
Revenue Recognition [Line Items]
Service revenues		$ 62		$ 167
Minimum | Service
Revenue Recognition [Line Items]
Performance obligations, period			1 day
Maximum | Service
Revenue Recognition [Line Items]
Performance obligations, period			2 years