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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 2,641	$ 3,337
Reclassifications into earnings, net of taxes	0	2
Change in fair value, net of taxes	5	1
Ending balance	2,445	2,633
Reclassification into earnings, tax	0	0
Change in fair value, tax	0	0
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	2	(4)
Ending balance	7	(1)
Aircraft fuel derivatives
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	0	(3)
Reclassifications into earnings, net of taxes	0	2
Change in fair value, net of taxes	0	1
Ending balance	0	0
Available-for-sale securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	2	(1)
Reclassifications into earnings, net of taxes	0	0
Change in fair value, net of taxes	5	0
Ending balance	$ 7	$ (1)

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Other Comprehensive Income (Loss), Debt Securities, Available-for-Sale And Cash Flow Hedge, Gain (Loss), Before Reclassification and After Tax, Parent

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of tax expense (benefit) for reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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Amount after tax of reclassification adjustments of other comprehensive income (loss).

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Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income (loss).

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Amount of equity (deficit) attributable to parent. Excludes temporary equity and equity attributable to noncontrolling interest.

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