Commitments (Details) $ in Millions	3 Months Ended	12 Months Ended
Dec. 31, 2021 USD ($) aircraft airbus	Dec. 31, 2021 USD ($) aircraft airbus	Feb. 18, 2022 USD ($) airbus
Other Commitments [Abstract]
Restricted assets pledged related to workers compensation insurance policies and other business partner agreements	$ 26	$ 26
Ratification bonus	$ 8
Percentage of employees represented by unions under collective bargaining agreements	46.00%	46.00%
Percentage of employees represented by unions under collective bargaining agreements, amendable or will become amendable within one year	20.00%	20.00%
Employment agreement		5 years
Employment agreement automatic renewal term		5 years
Renewal notice period		90 days
Subsequent Event
Unrecorded Unconditional Purchase Obligation [Line Items]
Number of optional aircraft converted to firm orders \| airbus			30
2022			$ 1,000
2023			1,700
2024			2,000
2025			1,600
2026			1,300
Thereafter			$ 1,000
A-321 Neo
Unrecorded Unconditional Purchase Obligation [Line Items]
Number of aircraft and spare engine orders by the firm \| airbus	64	64
Number of aircraft scheduled to receive next year \| aircraft	3	3
A220-300
Unrecorded Unconditional Purchase Obligation [Line Items]
Number of aircraft and spare engine orders by the firm \| airbus	62	62
Number of aircraft scheduled to receive next year \| aircraft	10	10

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One-time ratification bonus relating to the pilots union contract.

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