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Consolidated Statement of Comprehensive Income (Loss) (Parenthetical) (Unaudited) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax Effect [Abstract]        
Other Comprehensive Income, Unrealized Gain (Loss) on Derivatives Arising During Period, Tax $ 2 $ 0 $ 1 $ 0
Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Tax 1 0 1 0
Other Comprehensive Income (Loss), Tax [Abstract]        
Foreign currency translation adjustments, taxes 0 (25) 0 (37)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation,Tax 0 (36) 0 (36)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax [Abstract]        
Amortization of prior service cost (credit) included in net periodic benefit cost, taxes 1 0 2 1
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax 0 0 0 2
Amortization of actuarial (gain) loss included in net periodic benefit cost, taxes $ (2) $ (3) $ (7) $ (9)