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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 3,446	$ 3,813	$ 3,849	$ 3,951
Reclassifications into earnings, net of taxes	0	0	0	0
Reclassification into earnings, tax	0	0	0	0
Change in fair value	(3)	0	(5)	0
Change in fair value, tax	2	0	(2)	0
Ending balance	3,507	3,949	3,507	3,949
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(2)	0	0	0
Ending balance	(5)	0	(5)	0
Available-for-sale securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(2)	0	0	0
Reclassifications into earnings, net of taxes	0	0	0	0
Change in fair value	0	0	(2)	0
Ending balance	(2)	0	(2)	0
Aircraft Fuel Derivatives
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	0	0	0	0
Reclassifications into earnings, net of taxes	0	0	0	0
Change in fair value	(3)	0	(3)	0
Ending balance	$ (3)	$ 0	$ (3)	$ 0

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Amount, after tax and reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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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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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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