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Comprehensive Income (Loss) - Differences between Net Income and Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Condensed Statement of Income Captions [Line Items]                
NET INCOME (LOSS) $ 446     $ (1,157)     $ 909 $ (2,166)
Other, net of deferred taxes of $— and $3 0     11     (47) 8
Total other comprehensive income (loss) 131     28     391 (41)
COMPREHENSIVE INCOME (LOSS) 577 $ 544 $ 180 (1,129) $ (859) $ (219) 1,300 (2,207)
Other deferred taxes 0     3     (13) 2
Fuel derivative contracts                
Condensed Statement of Income Captions [Line Items]                
Unrealized gain (loss) on derivative instruments, net of deferred taxes 129     14     430 (20)
Derivative deferred taxes 39     5     131 (6)
Interest rate derivatives                
Condensed Statement of Income Captions [Line Items]                
Unrealized gain (loss) on derivative instruments, net of deferred taxes 2     3     8 (29)
Derivative deferred taxes $ 1     $ 0     $ 2 $ (9)