Income Taxes (Schedule of Income Tax Provision (Benefit)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
US	$ (22)	$ 28	$ 108
International	60	152	56
Total	38	180	164
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
US	108	54	156
International	(24)	(33)	(6)
Total	84	21	150
Income tax provision (benefit)	$ 122	$ 201	$ 314