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Commitments and Contingencies - Narrative (Details) $ / shares in Units, shares in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2021 employee | Jun. 30, 2021 USD ($) aircraft employee | Nov. 30, 2020 USD ($) | Nov. 30, 2018 USD ($) $ / shares shares
Commitments and Contingencies [Line Items] |  |  |  |
Number of aircraft delivered | aircraft |  | 11 |  |
Remaining term of debt |  | 11 years |  |
Employee Separation | Voluntary Separation Leave Programs |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |
Number of employees electing to voluntarily separate from the company | employee | 4,500 | 4,500 |  |
Flight Equipment |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |
Number of aircraft delivered | aircraft |  | 7 |  |
Operating Lease Right-of-Use Assets |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |
Number of aircraft delivered | aircraft |  | 4 |  |
Current/Long-Term Obligations under Operating Leases |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |
Number of aircraft delivered | aircraft |  | 4 |  |
United Airlines, Inc. |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |
Number of employees | employee |  | 84,400 |  |
Percentage of employees represented by various U.S. labor organizations |  | 85.00% |  |
Kingsland |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |
Number of shares that may be put to United (in shares) | shares |  |  |  | 144.8
Number of ADRs that may be put into United (in shares) | shares |  |  |  | 18.1
Market price of common stock at fifth anniversary (in dollars per share) | $ / shares |  |  |  | $ 12
Aggregate maximum possible combined put payment and guarantee amount |  |  |  | $ 217,000,000
Kingsland | Standby Letters of Credit |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |
Cash collateral for a standby letter of credit |  | $ 217,000,000 | $ 217,000,000 |
BRW | Term Loan Receivable |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |
Loan amount |  |  |  | $ 456,000,000
Tax-Exempt Special Facilities Revenue Bonds |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |
Aggregate principal amount of guarantee |  | 1,900,000,000 |  |
Aircraft Mortgage Debt |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |
Aggregate principal amount of guarantee |  | 113,000,000 |  |
Floating Rate Debt |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |
Debt |  | $ 13,400,000,000 |  |
Loans and Leases from Non-U.S. Entities |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |
Remaining term of debt |  | 11 years |  |
Aggregate balance |  | $ 10,200,000,000 |  |
Boeing 737-700 |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |
Number of aircraft committed to purchase | aircraft |  | 6 |  |
Airbus A319 |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |
Number of aircraft committed to purchase | aircraft |  | 11 |  |

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