Income Taxes - Liability Related to Uncertain Tax Positions (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at January 1	$ 39	$ 37
Gross increases for prior period tax positions	5	6
Gross increases for current period tax positions	3	2
Decreases due to the lapse of applicable statute of limitations	(4)	(2)
Decreases relating to settlements with taxing authorities	0	(4)
Balance at December 31	$ 43	$ 39