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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, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Condensed Statement of Income Captions [Line Items]                
NET INCOME $ 193     $ 277     $ 717 $ 759
Other, net of deferred taxes of $0 and $—             (4) 0
Total other comprehensive income (loss) 143     (500)     (143) (83)
COMPREHENSIVE INCOME (LOSS) 336 $ 544 $ (306) (223) $ 674 $ 225 574 676
Other deferred taxes             4 0
Fuel derivative contracts                
Condensed Statement of Income Captions [Line Items]                
Unrealized gain (loss) on derivative instruments, net of deferred taxes 135     (504)     (150) (101)
Derivative deferred taxes 41     (153)     (45) (31)
Interest rate derivatives                
Condensed Statement of Income Captions [Line Items]                
Unrealized gain (loss) on derivative instruments, net of deferred taxes 8     4     11 18
Derivative deferred taxes $ 2     $ 0     $ 2 $ 5