Goodwill and Other Intangible Assets - Changes in Goodwill (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Goodwill [Line Items]
Balance at beginning of period	$ 3,389	$ 3,649
Acquisitions	378
Goodwill reclassified from/(allocated to) assets held for sale		(260)
Balance at end of period	3,767	3,389
East Group
Goodwill [Line Items]
Balance at beginning of period	764	764
Acquisitions	267
Goodwill reclassified from/(allocated to) assets held for sale		0
Balance at end of period	1,031	764
West Group
Goodwill [Line Items]
Balance at beginning of period	2,625	2,885
Acquisitions	111
Goodwill reclassified from/(allocated to) assets held for sale		(260)
Balance at end of period	$ 2,736	$ 2,625