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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accumulated other comprehensive income (loss), net of taxes
Beginning balance	$ 3,849	$ 3,951	$ 4,799
Reclassifications into earnings, net of tax	4	0	9
Change in fair value	(4)	0	(11)
Ending balance	3,563	3,849	3,951
Reclassifications into earnings, tax	(3)	0	(5)
Change in fair value, tax	2	0	5
Accumulated Other Comprehensive Income (Loss)
Accumulated other comprehensive income (loss), net of taxes
Beginning balance	0	0	2
Ending balance	0	0	0
Aircraft Fuel Derivatives
Accumulated other comprehensive income (loss), net of taxes
Beginning balance	0	0	2
Reclassifications into earnings, net of tax	4	0	9
Change in fair value	(3)	0	(11)
Ending balance	1	0	0
Available-for-sale securities
Accumulated other comprehensive income (loss), net of taxes
Beginning balance	0	0	0
Reclassifications into earnings, net of tax	0	0	0
Change in fair value	(1)	0	0
Ending balance	$ (1)	$ 0	$ 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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