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Leases and Capacity Purchase Agreements - Narrative (Details) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) aircraft lease | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Lessee, Lease, Description [Line Items] |  |  |  |
Number of aircraft leases under various sale-leaseback transactions | lease |  | 42 |  |
Additional leases that have not yet commenced |  | $ 1,600 |  |
Lease terms of additional leases that have not yet commenced (up to) |  | 12 years |  |
Notes receivable |  | $ 103 |  |
Liabilities due |  | 3,835 | $ 3,395 |
Capacity Purchase Agreements | Subsequent Event |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Change in CPA future commitments | $ 600 |  |  |
United Airlines, Inc. |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Liabilities due |  | $ 3,835 | 3,395 |
Cash Collateralized Letters of Credit | United Airlines, Inc. |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Number of regional aircraft | aircraft |  | 413 |  |
Mainline Aircraft |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Number of aircraft subject to operating leases | aircraft |  | 70 |  |
Number of aircraft subject to finance leases | aircraft |  | 22 |  |
Mainline Aircraft | Minimum |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Initial term of operating leases |  | 1 month |  |
Mainline Aircraft | Maximum |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Initial term of operating leases |  | 12 years |  |
Regional Aircraft |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Number of aircraft subject to operating leases | aircraft |  | 275 |  |
Number of aircraft subject to finance leases | aircraft |  | 13 |  |
Regional Aircraft | United Airlines, Inc. | Capacity Purchase Agreements |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Expenses |  | $ 1,100 | 900 | $ 600
Regional Aircraft | United Airlines, Inc. | Capacity Purchase Agreements | Related Party |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Notes receivable |  | 84 | 62 |
Liabilities due |  | $ 122 | $ 118 |
Non-Aircraft | Minimum |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Initial term of operating leases |  | 1 month |  |
Non-Aircraft | Maximum |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Initial term of operating leases |  | 29 years |  |

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