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v3.20.1

Debt - Narrative (Details) | Apr. 20, 2020 USD ($) | Apr. 07, 2020 USD ($) | Mar. 20, 2020 USD ($) | Mar. 09, 2020 USD ($) | Mar. 31, 2020 USD ($)
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Subsequent Event |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total funding provided under the Payroll Support Program | $ 5,000,000,000.0 |  |  |  |
Used Aircraft Facility | Secured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face amount |  |  |  | $ 2,000,000,000 |
Interest rate floor |  |  |  | 1.00% |
Minimum required unrestricted cash and cash equivalents and unused commitments available |  |  |  | $ 2,000,000,000.0 |
Minimum required ratio of appraised value of collateral to the outstanding obligations |  |  |  | 1.60 |
Used Aircraft Facility | Before 180 Days | Secured Debt | LIBOR |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Percent spread on variable rate |  |  |  | 2.00% |
Used Aircraft Facility | Before 180 Days | Secured Debt | Alternative Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Percent spread on variable rate |  |  |  | 1.00% |
Used Aircraft Facility | 180-270 Days | Secured Debt | LIBOR |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Percent spread on variable rate |  |  |  | 2.25% |
Used Aircraft Facility | 180-270 Days | Secured Debt | Alternative Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Percent spread on variable rate |  |  |  | 1.25% |
Used Aircraft Facility | 270 Days and Longer | Secured Debt | LIBOR |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Percent spread on variable rate |  |  |  | 2.50% |
Used Aircraft Facility | 270 Days and Longer | Secured Debt | Alternative Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Percent spread on variable rate |  |  |  | 1.50% |
Spare Parts Facility | Secured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face amount |  |  | $ 500,000,000 |  |
Interest rate floor |  |  | 1.00% |  |
Minimum required unrestricted cash and cash equivalents and unused commitments available |  |  | $ 2,000,000,000.0 |  |
Minimum required ratio of appraised value of collateral to the outstanding obligations |  |  | 1.80 |  |
Minimum required ratio of appraised value of collateral to the outstanding obligations if certain spare parts are used |  |  | 2.00 |  |
Spare Parts Facility | 90-180 Days | Secured Debt | LIBOR |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Percent spread on variable rate |  |  | 2.75% |  |
Spare Parts Facility | 90-180 Days | Secured Debt | Alternative Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Percent spread on variable rate |  |  | 1.75% |  |
Spare Parts Facility | Before 90 Days | Secured Debt | LIBOR |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Percent spread on variable rate |  |  | 3.00% |  |
Spare Parts Facility | Before 90 Days | Secured Debt | Alternative Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Percent spread on variable rate |  |  | 2.00% |  |
Spare Parts Facility | 180-270 Days | Secured Debt | LIBOR |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Percent spread on variable rate |  |  | 3.25% |  |
Spare Parts Facility | 180-270 Days | Secured Debt | Alternative Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Percent spread on variable rate |  |  | 2.25% |  |
Spare Parts Facility | 270 Days and Longer | Secured Debt | LIBOR |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Percent spread on variable rate |  |  | 3.50% |  |
Spare Parts Facility | 270 Days and Longer | Secured Debt | Alternative Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Percent spread on variable rate |  |  | 2.50% |  |
Spare Engines Facility | Secured Debt | Subsequent Event |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face amount |  | $ 250,000,000 |  |  |
Interest rate floor |  | 1.00% |  |  |
Minimum required unrestricted cash and cash equivalents and unused commitments available |  | $ 2,000,000,000.0 |  |  |
Minimum required ratio of appraised value of collateral to the outstanding obligations |  | 1.40 |  |  |
Spare Engines Facility | Before 180 Days | Secured Debt | LIBOR | Subsequent Event |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Percent spread on variable rate |  | 3.00% |  |  |
Spare Engines Facility | Before 180 Days | Secured Debt | Alternative Rate | Subsequent Event |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Percent spread on variable rate |  | 2.00% |  |  |
Spare Engines Facility | 180-270 Days | Secured Debt | LIBOR | Subsequent Event |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Percent spread on variable rate |  | 3.25% |  |  |
Spare Engines Facility | 180-270 Days | Secured Debt | Alternative Rate | Subsequent Event |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Percent spread on variable rate |  | 2.25% |  |  |
Spare Engines Facility | 270 Days and Longer | Secured Debt | LIBOR | Subsequent Event |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Percent spread on variable rate |  | 3.50% |  |  |
Spare Engines Facility | 270 Days and Longer | Secured Debt | Alternative Rate | Subsequent Event |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Percent spread on variable rate |  | 2.50% |  |  |
PSP Note | Unsecured Debt | Subsequent Event |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face amount | $ 714,000,000.0 |  |  |  |
Percent increase in the principal amount based on any disbursement made by the U.S. Treasury Department | 30.00% |  |  |  |
Aggregate principal amount after all disbursements | $ 1,500,000,000 |  |  |  |
Term of debt | 10 years |  |  |  |
PSP Note | Years 1 through 5 | Unsecured Debt | Subsequent Event |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate | 1.00% |  |  |  |
PSP Note | Years 6 through 10 | Unsecured Debt | SOFR | Subsequent Event |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Percent spread on variable rate | 2.00% |  |  |  |
Revolving Credit Facility | United Airlines, Inc. | Secured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Available under revolving credit facility |  |  |  |  | $ 2,000,000,000.0

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