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Leases and Capacity Purchase Agreements - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2022 USD ($) aircraft | Dec. 31, 2021 USD ($) aircraft | Dec. 31, 2020 USD ($)
Lessee, Lease, Description [Line Items] |  |  |
Additional leases that have not yet commenced | $ | $ 3,000.0 |  |
Lease terms of additional leases that have not yet commenced (up to) | 12 years |  |
Boeing 737 Max |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Number of aircraft acquired with exercised purchase options |  | 6 |
Capacity Purchase Agreements | CRJ-900 |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Initial term of operating leases | 5 years |  |
Number of aircraft subject to embedded leases | 38 |  |
Cash Collateralized Letters of Credit | United Airlines, Inc. |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Number of regional aircraft | 470 |  |
Mainline Aircraft |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Number of aircraft subject to operating leases | 99 |  |
Number of aircraft subject to finance leases | 26 |  |
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 | 318 |  |
Number of aircraft subject to finance leases | 16 |  |
Regional Aircraft | United Airlines, Inc. | Capacity Purchase Agreements |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Expenses | $ | $ 900.0 | $ 600.0 | $ 600.0
Notes receivables | $ | $ 62.0 | 28.0 |
Accounts payable | $ |  | $ 102.0 |
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 | 30 years |  |

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