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Segments - Financial Data for Continuing Operations for Company's Reportable Business Segments (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Segment Reporting Information [Line Items]
Assets employed	$ 18,653		$ 18,170
Total property additions, including the impact of acquisitions	863	$ 2,938
Property additions through business combinations	339	2,524
Reportable Segments
Segment Reporting Information [Line Items]
Assets employed	17,674		16,662
Total property additions, including the impact of acquisitions	845	2,926
Property additions through business combinations	339	2,524
Operating Segments | East Group
Segment Reporting Information [Line Items]
Assets employed	8,738		8,452
Total property additions, including the impact of acquisitions	307	2,219
Property additions through business combinations	0	2,052
Operating Segments | West Group
Segment Reporting Information [Line Items]
Assets employed	8,034		7,941
Total property additions, including the impact of acquisitions	173	683
Property additions through business combinations	2	472
Operating Segments | Specialties
Segment Reporting Information [Line Items]
Assets employed	902		269
Total property additions, including the impact of acquisitions	365	24
Property additions through business combinations	337	0
Corporate
Segment Reporting Information [Line Items]
Assets employed	979		$ 1,508
Total property additions, including the impact of acquisitions	18	12
Property additions through business combinations	$ 0	$ 0

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