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Accumulated Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Mar. 31, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Accumulated other comprehensive income (loss), net of tax A rollforward of the amounts included in accumulated other comprehensive income (loss), net of taxes for the three months ended March 31, 2024 and 2023 is as follows (in millions):
Aircraft fuel derivatives (1)
Available-for-sale securitiesTotal
Balance of accumulated loss, at December 31, 2023$(3)$(1)$(4)
Reclassifications into earnings, net of taxes of $0
2 — 2 
Change in fair value, net of taxes of $0
1 — 1 
Balance of accumulated gain (loss), at March 31, 2024
$— $(1)$(1)
Balance of accumulated income (loss), at December 31, 2022$1 $(1)$— 
Reclassifications into earnings, net of taxes $0
(1)— (1)
Change in fair value, net of taxes of $(1)
(4)— (4)
Balance of accumulated loss, at March 31, 2023
$(4)$(1)$(5)

    (1) Reclassified to aircraft fuel expense.