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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Condensed Consolidated Statements of Comprehensive Income    
(Losses) on cash-flow hedges, income tax effect $ 3  
Gains on cash-flow hedges, income tax effect   $ (5)
Losses on cash-flow hedges reclassified to earnings, income tax effect   $ (1)