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Comprehensive Income (Loss) - Schedule of AOCI Components (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	$ 11,120	$ 10,414
Changes in fair value	(352)	452
Reclassification to earnings	(148)	(535)
Balance at end of period	10,924	10,924
Accumulated other comprehensive income
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	805	388
Balance at end of period	305	305
Fuel and Interest Rate Derivatives | Fuel derivative contracts
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	1,017	492
Changes in fair value	(462)	571
Reclassification to earnings	(195)	(703)
Balance at end of period	360	360
Fuel and Interest Rate Derivatives | Interest rate derivatives
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(38)	(57)
Changes in fair value	2	18
Reclassification to earnings	2	5
Balance at end of period	(34)	(34)
Defined benefit plan items
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	66	66
Balance at end of period	66	66
Deferred tax
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(240)	(113)
Changes in fair value	108	(137)
Reclassification to earnings	45	163
Balance at end of period	$ (87)	$ (87)

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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, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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

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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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