Goodwill - Changes in Goodwill (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2025 USD ($)
Goodwill [Line Items]
Balance at January 1, 2025	$ 3,767
Adjustments to purchase price allocations	6
Balance at March 31, 2025	3,773
East Group
Goodwill [Line Items]
Balance at January 1, 2025	1,031
Adjustments to purchase price allocations	(1)
Balance at March 31, 2025	1,030
West Group
Goodwill [Line Items]
Balance at January 1, 2025	2,736
Adjustments to purchase price allocations	7
Balance at March 31, 2025	$ 2,743