COMMITMENTS AND CONTINGENCIES - Narrative (Details) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
|
Sep. 30, 2026
USD ($)
employee
|
Sep. 30, 2025
USD ($)
|
Sep. 30, 2026
USD ($)
employee
|
Sep. 30, 2025
USD ($)
|
|
| Commitments and Contingencies [Line Items] | ||||
| Special charge related to ratification payment | $ (2) | $ 0 | $ 182 | $ 561 |
| Association of Flight Attendants | ||||
| Commitments and Contingencies [Line Items] | ||||
| Special charge related to ratification payment | $ 740 | |||
| United Airlines, Inc. | ||||
| Commitments and Contingencies [Line Items] | ||||
| Number of employees | employee | 117,900 | 117,900 | ||
| Percentage of employees represented by various U.S. labor organizations | 83.00% | |||
| Floating Rate Debt | ||||
| Commitments and Contingencies [Line Items] | ||||
| Carrying Amount | $ 11,800 | $ 11,800 | ||
| Remaining term of debt | 12 years | |||
| Loans and Leases from Non-U.S. Entities | ||||
| Commitments and Contingencies [Line Items] | ||||
| Remaining term of debt | 12 years | |||
| Aggregate balance | $ 9,200 | $ 9,200 | ||