Income Taxes (Components of Income Tax Expense) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current income tax expense
U.S. federal	$ 12	$ 86	$ 7
U.S. State and local	6	15	4
Non-U.S.	320	296	297
Total current income tax	338	397	308
Deferred income tax expense
U.S. federal	1	(1)	44
U.S. State and local	(3)	13	7
Non-U.S.	(45)	(17)	(6)
Deferred Income Tax Expense (Benefit)	(47)	(5)	45
Total	$ 291	$ 392	$ 353