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Accumulated Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Mar. 31, 2025
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule of 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, 2025 and 2024 is as follows (in millions):
Aircraft fuel derivatives (1)
Available-for-sale securitiesTotal
Balance of accumulated income at December 31, 2024$— $2 $2 
Reclassifications into earnings, net of taxes of $0
— — — 
Change in fair value, net of taxes of $0
— 5 5 
Balance of accumulated income, at March 31, 2025$— $7 $7 
Balance of accumulated loss, at December 31, 2023$(3)$(1)$(4)
Reclassifications into earnings, net of taxes of $0
2 — 2 
Change in fair value, net of taxes of $0
1 — 1 
Balance of accumulated loss, at March 31, 2024$— $(1)$(1)
(1) Reclassified to aircraft fuel expense for the three months ended March 31, 2024. As of December 31, 2024 and March 31, 2025 there were no outstanding fuel derivative contracts.