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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Condensed Consolidated Statements of Comprehensive Income        
Gains (losses) on cash-flow hedges, income tax effect $ (3)      
Gains (losses) on cash-flow hedges, income tax effect   $ 5    
Losses (gains) on cash-flow hedges reclassified to earnings, income tax effect $ (1)   $ (1)  
Losses (gains) on cash-flow hedges reclassified to earnings, income tax effect       $ (1)