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Revenue Recognition - Additional Information (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Capitalized Contract Cost [Line Items]
Air traffic liability		$ 273	$ 135
Customer rights to book future travel		$ 59
Non-refundable payment	$ 25
Minimum
Capitalized Contract Cost [Line Items]
Future travel credit balance, expiration period			3 months
Maximum
Capitalized Contract Cost [Line Items]
Future travel credit balance, expiration period			12 months
Passenger
Capitalized Contract Cost [Line Items]
Air traffic liability recognized as passenger revenue		89.00%
Passenger Revenue, From Expiration Of Customer Rights
Capitalized Contract Cost [Line Items]
Passenger revenue recongnized		$ 58	$ 126	$ 26

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- Definition

Contract With Customer, Future Travel Liability, Expiration Period

+ References

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- Definition

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+ References

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- Definition

Contract With Customer, Liability, Frequent Flyer, Increase For Modification Of Contract

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- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130549-203045

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