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Subsequent Events (Details)			12 Months Ended
	Feb. 05, 2022 USD ($) $ / shares	Feb. 02, 2022 USD ($)	Dec. 31, 2021 USD ($) $ / shares	Dec. 31, 2020 USD ($) $ / shares	Dec. 31, 2019 USD ($)
Subsequent Event [Line Items]
Principal repayments on debt			$ 97,000,000	$ 126,000,000	$ 139,000,000
Interest paid			$ 9,000,000	$ 7,000,000	$ 10,000,000
Common stock, stated par (in dollars per share) | $ / shares			$ 0.001	$ 0.001
Spirit Airlines, Inc Merger
Subsequent Event [Line Items]
Transaction or integration planning costs			$ 0
Subsequent Event
Subsequent Event [Line Items]
Common stock, stated par (in dollars per share) | $ / shares	$ 0.001
Subsequent Event | CARES Credit Agreement | Line of Credit
Subsequent Event [Line Items]
Principal repayments on debt		$ 150,000,000
Interest paid		$ 1,000,000
Length of limitations on stock repurchases and payment of dividends		1 year
Subsequent Event | Spirit Airlines, Inc.
Subsequent Event [Line Items]
Common stock, stated par (in dollars per share) | $ / shares	$ 0.0001
Subsequent Event | Spirit Airlines, Inc Merger
Subsequent Event [Line Items]
Business combination exchange ratio	1.9126
Stock price per share (in dollars per share) | $ / shares	$ 2.13
Termination fee	$ 94,200,000

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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