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Debt - Narrative (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Apr. 21, 2021 | Dec. 31, 2021
2026 Notes and 2029 Notes | Secured Debt |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount | $ 4,000,000,000 |
2026 Notes | Secured Debt |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount | $ 2,000,000,000 |
Stated interest rate | 4.375% |
Issuance price as a percent of principal amount | 100.00% |
2029 Notes | Secured Debt |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount | $ 2,000,000,000 |
Stated interest rate | 4.625% |
Issuance price as a percent of principal amount | 100.00% |
PSP2 Note | Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount |  | $ 870,000,000
Term of debt |  | 10 years
PSP2 Note | Years One through Five | Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Stated interest rate |  | 1.00%
PSP2 Note | Years Six through Ten | Unsecured Debt | SOFR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate |  | 2.00%
PSP3 Note | Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount |  | $ 810,000,000
Term of debt |  | 10 years
PSP3 Note | Years One through Five | Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Stated interest rate |  | 1.00%
PSP3 Note | Years Six through Ten | Unsecured Debt | SOFR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate |  | 2.00%
Term Loan B Facility due 2028 | Secured Debt |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount | $ 5,000,000,000 |
Quarterly installment repayment as a percent of the original principal amount | 0.25% |
Term Loan B Facility due 2028 | Secured Debt | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 3.75% |
Variable rate floor | 0.75% |
Term loan | Secured Debt |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount | $ 1,400,000,000 |
Term loan | Secured Debt | LIBOR | Minimum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate |  | 0.49%
Term loan | Secured Debt | LIBOR | Maximum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate |  | 5.25%
CARES Act Term Loan Facility | Secured Debt |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount | $ 520,000,000 |
CARES Act Term Loan Facility | Secured Debt | LIBOR | Minimum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate |  | 0.49%
CARES Act Term Loan Facility | Secured Debt | LIBOR | Maximum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate |  | 5.25%
Borrowings Financing Aircraft Purchases |  |
Debt Instrument [Line Items] |  |
Long term debt |  | $ 11,200,000,000
Revolving Credit Facility | Secured Debt | United Airlines, Inc. |  |
Debt Instrument [Line Items] |  |
Available under revolving credit facility |  | $ 1,750,000,000
Revolving Credit Facility | Secured Debt | LIBOR | Minimum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate |  | 0.49%
Revolving Credit Facility | Secured Debt | LIBOR | Maximum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate |  | 5.25%
Revolving Credit Facility | Senior Secured Revolving Credit Facility due 2025 | Secured Debt |  |
Debt Instrument [Line Items] |  |
Commitment fee percentage | 0.75% |
Revolving Credit Facility | Senior Secured Revolving Credit Facility due 2025 | Secured Debt | LIBOR | Minimum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 3.00% |
Revolving Credit Facility | Senior Secured Revolving Credit Facility due 2025 | Secured Debt | LIBOR | Maximum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 3.50% |
Revolving Credit Facility | Credit Agreement | Secured Debt |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount | $ 1,000,000,000 |

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