Income Taxes (Components of Income Tax Expense) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current income tax expense
U.S. federal	$ 7	$ 179	$ (251)
U.S. State and local	4	49	(12)
Non-U.S.	297	349	306
Total current income tax	308	577	43
Deferred income tax expense
U.S. federal	44	107	173
U.S. State and local	7	(16)	(10)
Non-U.S.	(6)	(53)	8
Deferred Income Tax Expense (Benefit)	45	38	171
Total	$ 353	$ 615	$ 214