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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated other comprehensive income (loss), net of taxes
Beginning balance	$ 3,951	$ 4,799	$ 4,685
Reclassifications into earnings, tax	0	(5)	(1)
Change in fair value, tax	0	5	0
Ending balance	3,849	3,951	4,799
Aircraft Fuel Derivatives
Accumulated other comprehensive income (loss), net of taxes
Beginning balance	0	2	(3)
Reclassifications into earnings, net of tax	0	9	4
Change in fair value	0	(11)	1
Ending balance	0	$ 0	$ 2
Other comprehensive income (loss), cash flow hedge, reclassification for discontinuance, before tax	$ 5

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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, 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, before tax, of reclassification from accumulated other comprehensive income (AOCI) for gain (loss) from discontinuance of 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 stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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