Income Taxes (Reconciliation of Unrecognized Tax Benefits Roll Forward) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Balance at January 1	$ 138	$ 132	$ 106
Increases-prior period positions	6	5	76
Decreases-prior period positions	(57)	0	(53)
Increases-current period positions	1	1	3
Settlements with tax authorities	(26)	0	0
Balance at December 31	$ 62	$ 138	$ 132