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Comprehensive Income (Loss) - Differences between Net Income and Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Condensed Statement of Income Captions [Line Items]    
NET INCOME (LOSS) $ (278) $ 116
Other, net of deferred taxes of $— and ($13) 0 (47)
Total other comprehensive income 503 64
COMPREHENSIVE INCOME 225 180
Other deferred taxes 0 (13)
Fuel derivative contracts    
Condensed Statement of Income Captions [Line Items]    
Unrealized gain (loss) on derivative instruments, net of deferred taxes 498 101
Derivative deferred taxes 151 30
Interest rate derivatives    
Condensed Statement of Income Captions [Line Items]    
Unrealized gain (loss) on derivative instruments, net of deferred taxes 5 10
Derivative deferred taxes $ 2 $ 3