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Consolidated Statement of Comprehensive Income (Parenthetical) (Unaudited) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax [Abstract]        
Other Comprehensive Income, Unrealized Gain (Loss) on Derivatives Arising During Period, Tax $ 3 $ 2 $ 6 $ 1
Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Tax (2) 1 (3) 1
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 0 1 0 2
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax 0 0 (1) 0
Amortization of actuarial (gain) loss included in net periodic benefit cost, taxes $ (3) $ (2) $ (5) $ (7)