Revenues and Gross Profit - Total Revenues and Gross Profit (Loss) by Product Line (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Product Information [Line Items]
Revenues	$ 1,811	$ 1,764	$ 3,164	$ 3,015
Gross profit (loss)	544	517	879	790
Interproduct Revenues
Product Information [Line Items]
Revenues	(72)	(65)	(121)	(102)
Corporate
Product Information [Line Items]
Revenues	0	0	0	0
Gross profit (loss)	(9)	(11)	(10)	(16)
Building Materials Business | Operating Segments
Product Information [Line Items]
Revenues	1,721	1,683	2,986	2,854
Gross profit (loss)	517	501	815	750
Magnesia Specialties | Operating Segments
Product Information [Line Items]
Revenues	90	81	178	161
Gross profit (loss)	36	27	74	56
Aggregates | Building Materials Business | Operating Segments | Reportable Subsegments
Product Information [Line Items]
Revenues	1,320	1,242	2,322	2,127
Gross profit (loss)	430	392	726	632
Cement and ready mixed concrete | Building Materials Business | Operating Segments | Reportable Subsegments
Product Information [Line Items]
Revenues	245	261	477	526
Gross profit (loss)	54	72	78	103
Asphalt and paving services | Building Materials Business | Operating Segments | Reportable Subsegments
Product Information [Line Items]
Revenues	228	245	308	303
Gross profit (loss)	$ 33	$ 37	$ 11	$ 15