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Incomes Taxes (Income tax (benefit) provision) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
United States, current federal tax expense (benefit) $ 34 $ 98 $ 7
Current foreign tax expense (benefit) 167 181 182
Current state and local tax expense (benefit) 7 10 (2)
Current income tax expense (benefit) 208 289 187
United States, deferred federal income tax expense (benefit) 120 55 8
Deferred foreign income tax expense (benefit) (154) (143) 12
Deferred state and local income tax expense (benefit) 12 8 (18)
Deferred income tax expense (benefit) (22) (80) 2
Total income tax expense $ 186 $ 209 $ 189