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Leases - Narrative (Details) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 05, 2022 USD ($) aircraft | Jun. 30, 2020 USD ($) aircraft | Dec. 31, 2022 USD ($) aircraft | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Lessee, Lease, Description [Line Items] |  |  |  |  |
Proceeds from sale-leaseback transactions |  |  | $ 0 | $ 0 | $ 815,000,000
Gain on sale-leaseback transactions |  |  | 0 | 0 | 222,000,000
Capital expenditures |  |  | 3,924,000,000 | 505,000,000 | 515,000,000
Payments of long-term debt and finance lease obligations |  |  | 2,437,000,000 | 612,000,000 | $ 839,000,000
Total lease obligations |  |  | $ 189,000,000 | $ 459,000,000 |
Airport-Related |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Term of lease contract (in years) |  |  | 38 years |  |
B-737-8 Max |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Number of aircrafts available for operating lease | aircraft |  | 10 |  |  |
Term of lease contract (in years) |  | 13 years |  |  |
Proceeds from sale-leaseback transactions |  | $ 410,000,000 |  |  |
Gain on sale-leaseback transactions |  | $ 69,000,000 |  |  |
B-737-800 |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Number of aircrafts available for operating lease | aircraft |  | 10 |  |  |
Term of lease contract (in years) |  | 10 years |  |  |
Proceeds from sale-leaseback transactions |  | $ 405,000,000 |  |  |
Gain on sale-leaseback transactions |  | $ 153,000,000 |  |  |
Boeing 737-700 | Aircraft |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Number of aircrafts to be purchased | aircraft | 39 |  | 8 |  |
Number of aircrafts purchased | aircraft |  |  | 31 |  |
Capital expenditures | $ 365,000,000 |  |  |  |
Payments of long-term debt and finance lease obligations |  |  | $ 191,000,000 |  |
Total lease obligations |  |  | $ 174,000,000 |  |
Number of leased aircrafts | aircraft |  |  | 28 |  |
Gain on sale of aircrafts |  |  | $ 0 |  |
Minimum | Aircraft |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Renewal term (in years) |  |  | 3 months |  |
Minimum | Other |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Renewal term (in years) |  |  | 6 months |  |
Minimum | Airport-Related |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Renewal term (in years) |  |  | 1 year |  |
Maximum | Aircraft |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Term of contract (in years) |  |  | 11 years |  |
Renewal term (in years) |  |  | 3 years |  |
Maximum | Other |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Term of contract (in years) |  |  | 4 years |  |
Renewal term (in years) |  |  | 3 years |  |
Maximum | Airport-Related |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Renewal term (in years) |  |  | 11 years |  |

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