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Accumulated Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 2024
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 September 30, 2024 and 2023 is as follows (in millions):
Aircraft fuel derivatives (1)
Available-for-sale securitiesTotal
Balance of accumulated loss, at June 30, 2024$— $(1)$(1)
Reclassifications into earnings, net of taxes of $0
2 — 2 
Change in fair value, net of taxes of $(1)
(4)— (4)
Balance of accumulated loss, at September 30, 2024$(2)$(1)$(3)
Balance of accumulated loss, at June 30, 2023$(5)$(1)$(6)
Reclassifications into earnings, net of taxes of $(2)
(5)— (5)
Change in fair value, net of taxes of $6
15 — 15 
Balance of accumulated income (loss) at September 30, 2023$5 $(1)$4 

    (1) Reclassified to aircraft fuel expense.
A rollforward of the amounts included in accumulated other comprehensive income (loss), net of taxes for the nine months ended September 30, 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 $1
6 (1)5 
Change in fair value, net of taxes of $(1)
(5)1 (4)
Balance of accumulated loss, at September 30, 2024$(2)$(1)$(3)
Balance of accumulated income (loss), at December 31, 2022$1 $(1)$— 
Reclassifications into earnings, net of taxes of $(1)
(2)— (2)
Change in fair value, net of taxes of $4
6 — 6 
Balance of accumulated income (loss), at September 30, 2023$5 $(1)$4 
(1) Reclassified to aircraft fuel expense.