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Leases and Capacity Purchase Agreements - Narrative (Details) $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 aircraft | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) aircraft | Dec. 31, 2020 USD ($) aircraft | Dec. 31, 2019 USD ($) | Aug. 31, 2021 USD ($)
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Additional leases that have not yet commenced | $ |  |  | $ 415 |  |  |
Lease terms of additional leases that have not yet commenced (up to) |  |  | 12 years |  |  |
Number of aircraft included in flight equipment |  |  | 7 |  |  |
Number of aircraft qualified for sale recorded as operating lease right-of-use assets and current/long-term obligations |  |  | 17 |  |  |
Special Facility Revenue Bonds | Secured Debt |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Fixed interest rate |  |  |  |  |  | 4.00%
Special Facility Revenue Bonds | Secured Debt | City of Houston |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Aggregate principal amount | $ |  |  |  |  |  | $ 289
Boeing 787-9 and Boeing 737 MAX |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Number of aircraft delivered under sale and leaseback transaction |  |  |  | 24 |  |
Boeing 787 |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Number of aircraft acquired with exercised purchase options |  |  | 6 |  |  |
Boeing 737 MAX |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Number of aircraft acquired with exercised purchase options |  |  | 8 |  |  |
Embraer E175 |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Number of regional aircraft | 38 |  |  |  |  |
United Airlines, Inc. | Embraer E175 |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Long-term purchase commitment, period | 12 years |  |  |  |  |
United Airlines, Inc. | Cash Collateralized Letters of Credit |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Number of regional aircraft |  |  | 518 |  |  |
Mainline Aircraft |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Number of aircraft subject to operating leases |  |  | 118 |  |  |
Number of aircraft subject to finance leases |  |  | 25 |  |  |
Regional Aircraft |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Number of aircraft subject to operating leases |  |  | 282 |  |  |
Number of aircraft subject to finance leases |  |  | 58 |  |  |
Regional Aircraft | United Airlines, Inc. | Capacity Purchase Agreements |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Expenses | $ |  |  | $ 600 | $ 600 | $ 1,000 |
Accounts payable | $ |  |  | $ 102 | $ 68 |  |
Minimum | Mainline Aircraft |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Initial term of operating leases |  |  | 1 month |  |  |
Minimum | Non-Aircraft |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Initial term of operating leases |  |  | 1 month |  |  |
Maximum | Mainline Aircraft |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Initial term of operating leases |  |  | 12 years |  |  |
Maximum | Non-Aircraft |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Initial term of operating leases |  |  | 31 years |  |  |
Forecast | Capacity Purchase Agreements |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Scheduled block hours increase (decrease) percentage |  | 10.00% |  |  |  |
Change in cash obligation | $ |  | $ 125 |  |  |  |

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