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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated gains (losses) beginning balance			$ 0
Reclassification into earnings, tax	$ 0	$ 1	0	$ 2
Change in fair value, tax	0	0	0	(5)
Accumulated gains (losses) ending balance	0		0
Aircraft Fuel Derivatives
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated gains (losses) beginning balance			0	2
Reclassifications into earnings, net of taxes			0	6
Change in fair value, net of deferred taxes			0	(11)
Accumulated gains (losses) ending balance	0	(3)	0	(3)
Losses previously deferred in other comprehensive loss reclassified to interest income				4
Fuel Derivatives
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated gains (losses) beginning balance	0	(6)
Reclassification into earnings, tax	0	3
Change in fair value, net of deferred taxes	0	0
Accumulated gains (losses) ending balance	$ 0	(3)	$ 0	$ (3)
Losses previously deferred in other comprehensive loss reclassified to interest income		$ 2

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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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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Amount of increase (decrease) in accumulated other comprehensive income.

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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, after tax, of 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 of tax expense (benefit) allocated to other comprehensive income (loss).

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

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