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Income Taxes (Net Deferred Tax Asset (Liability)) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]    
Current deferred tax asset $ 5 $ 3
Current deferred tax liability (1,258) (829)
Noncurrent deferred tax asset 1,362 1,272
Noncurrent deferred tax liability (72) (75)
Net deferred tax asset $ 37 $ 371