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Commitments and Contingencies - Narrative (Details) | 12 Months Ended
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Dec. 31, 2021 USD ($) employee option
Commitments and Contingencies [Line Items] |
Aggregate balance | $ 13,600,000,000
Number of call options to purchase regional jet aircraft | option | 251
United Airlines, Inc. |
Commitments and Contingencies [Line Items] |
Number of employees | employee | 84,100
Percentage of employees represented by various U.S. labor organizations | 85.00%
United Airlines, Inc. | Surety Bonds |
Commitments and Contingencies [Line Items] |
Contingent liabilities based on participation | $ 371,000,000
Tax-Exempt Special Facilities Revenue Bonds |
Commitments and Contingencies [Line Items] |
Guarantor obligations, maximum exposure | 2,100,000,000
Tax-Exempt Special Facilities Revenue Bonds | Indirect Guarantee of Indebtedness |
Commitments and Contingencies [Line Items] |
Guarantor obligations, maximum exposure | 343,000,000
Contingent liabilities based on participation | 1,800,000,000
Aircraft Mortgage Debt |
Commitments and Contingencies [Line Items] |
Guarantor obligations, maximum exposure | $ 106,000,000
Loans And Leases From Non U S Entities |
Commitments and Contingencies [Line Items] |
Debt instrument, remaining terms | 11 years
Aggregate balance | $ 10,100,000,000
Floating Rate Debt |
Commitments and Contingencies [Line Items] |
Aggregate principal amount | $ 13,200,000,000
Debt instrument, remaining terms | 11 years

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