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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Derivatives qualifying as cash flow hedges:      
Gain (loss) on derivatives qualifying as cash flow hedges, tax (benefit) $ 1 $ (10) $ 2
Less: Reclassification adjustment for loss on derivatives included in net income, tax (benefit) 0 (3) (4)
Pension and postretirement benefits:      
Changes in pension and postretirement benefits, tax (benefit) 9 (27) (19)
Less: Amortization of prior service cost included in net periodic pension cost, tax (benefit) (2) (10) (7)
Foreign currency translation:      
Changes in foreign currency translation, tax (benefit) 0 0 0
Less: Translation loss realized upon sale of foreign equity method investment tax (benefit) $ (2) $ 0 $ 0