Income Taxes Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
U.S. federal	$ 37	$ 47	$ (17)
Non-U.S.	214	238	185
U.S. state and local	(2)	3	(1)
Total current	249	288	167
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
U.S. federal	(15)	(88)	(1)
Non-U.S.	(12)	(33)	(5)
U.S. state and local	1	0	0
Total deferred	(26)	(121)	(6)
Total income tax expense	223	167	161
Income Taxes Paid or Withheld	$ 275	$ 253	$ 231