Income Taxes (Reconciliation of Unrecognized Tax Benefits Roll Forward) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Balance at January 1,	$ 68	$ 62	$ 138
Increases-prior period positions	5	6	6
Decreases-prior period positions	(11)	(1)	(57)
Increases-current period positions	0	1	1
Settlements with tax authorities	0	0	(26)
Balance at December 31,	$ 62	$ 68	$ 62