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Differences between Net Income and Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Condensed Statement of Income Captions [Line Items]        
Net income $ 733 $ 743 $ 1,195 $ 1,082
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 3 2 3 2
Other Comprehensive Income (Loss), Net of Tax 220 49 304 60
Comprehensive Income (Loss), Net of Tax, Attributable to Parent 953 792 1,499 1,142
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent 0 0 0 0
Fuel derivatives        
Condensed Statement of Income Captions [Line Items]        
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax 216 46 297 55
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax 66 27 91 32
Interest rate derivatives        
Condensed Statement of Income Captions [Line Items]        
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax 1 1 4 3
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax $ 1 $ 1 $ 1 $ 2