Income Taxes - Reconciliation of Uncertain Tax Positions (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Reconciliation of Unrecognized Tax Benefits
Unrecognized tax positions, beginning balance		$ 211	$ 196	$ 322
Additions for tax positions related to the current year		22	33	21
Additions for tax positions of prior years		0	11	3
Reductions for tax positions of prior years		(5)	(11)	(17)
Settlements with taxing authorities		0	(3)	(108)
Lapse of statute of limitations	$ (64)	(70)	(15)	(25)
Unrecognized tax positions, ending balance	$ 158	$ 158	$ 211	$ 196