Income Taxes (Schedule of Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
U.S. federal	$ 227	$ (73)	$ (7)
U.S. state and local	37	(23)	(12)
Non-U.S.	165	112	76
Current tax provision (benefit), total	429	16	57
U.S. federal	12	(1,150)	134
U.S. state and local	50	9	27
Non-U.S.	(46)	40	(25)
Deferred income tax provision (benefit), net	16	(1,101)	136
Income tax provision (benefit)	$ 445	$ (1,085)	$ 193