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AOCI - Differences between Net Income and Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Condensed Statement of Income Captions [Line Items]        
NET INCOME $ 615 $ 528 $ 1,811 $ 1,610
Other, net of deferred taxes 6 2 9 4
Total other comprehensive income 114 127 418 187
COMPREHENSIVE INCOME 729 655 2,229 1,797
Other deferred taxes 1 2 1 2
Fuel derivatives        
Condensed Statement of Income Captions [Line Items]        
Unrealized gain (loss) on derivative instruments, net of deferred taxes 107 123 404 178
Derivative deferred taxes 32 73 123 105
Interest rate derivatives        
Condensed Statement of Income Captions [Line Items]        
Unrealized gain (loss) on derivative instruments, net of deferred taxes 1 2 5 5
Derivative deferred taxes $ 0 $ 0 $ 1 $ 2