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WORLDWIDE PANDEMIC - Narrative (Details) $ / shares in Units, $ in Millions |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 23, 2026 | Jan. 15, 2026 | Apr. 20, 2025 | Jun. 01, 2020 employee | Sep. 30, 2021 USD ($) aircraft employee $ / shares | Sep. 30, 2021 USD ($) aircraft employee $ / shares | Dec. 31, 2020 USD ($)
COVID - 19 |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
Voluntary separation program 2020 participants |  |  |  |  | 4,200 | 4,200 |
Number of employees who participated in extended emergency time off during 2020 |  |  |  | 11,000 | 1,000 | 1,000 |
Total employees who participated in extended emergency time off During 2020, who were still on emergency time off at December 31, 2020 |  |  |  | 500 |  |  |
Number of days before the end of their term |  |  |  | 90 days |  |  |
Employees who elected conversion in extended emergency time off |  |  |  |  |  | 300 |
Extended emergency time off accrual for employees who accepted through 2020 | $ |  |  |  |  | $ 369 | $ 405 | $ 1,400
Extended emergency time off reversal for employees who accepted through March 31, 2021 | $ |  |  |  |  |  | 140 |
Proceeds from PSP2 payroll support program | $ |  |  |  |  | $ 763 | $ 2,700 |
Aircrafts in long-term storage | aircraft |  |  |  |  | 24 | 24 |
COVID - 19 | Minimum |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
Extended emergency time off, period |  |  |  | 6 months |  |  |
COVID - 19 | Minimum | Option to Convert to Voluntary Separation Program 2020 |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
Extended emergency time off, period |  |  |  | 12 months |  |  |
Years of service |  |  |  | 10 years |  |  |
COVID - 19 | Maximum |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
Extended emergency time off, period |  |  |  | 18 months |  |  |
COVID - 19 | Maximum | Option to Convert to Voluntary Separation Program 2020 |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
Extended emergency time off, period |  |  |  | 18 months |  |  |
COVID - 19 | Maximum | Pilots |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
Extended emergency time off, period |  |  |  | 5 years |  |  |
United States Department of Treasury | PSP1 Payroll Support Program |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
Strike price (in USD per share) | $ / shares |  |  |  |  | $ 36.47 | $ 36.47 |
United States Department of Treasury | PSP1 Payroll Support Program | Notes Payable, Other Payables |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 1.00% | 1.00% |
United States Department of Treasury | PSP1 Payroll Support Program | Notes Payable, Other Payables | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Forecast |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
Variable rate (as a percent) |  |  | 2.00% |  |  |  |
United States Department of Treasury | PSP2 Payroll Support Program |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
Strike price (in USD per share) | $ / shares |  |  |  |  | $ 46.28 | $ 46.28 |
Expiration period (in years) |  |  |  |  |  | 5 years |
United States Department of Treasury | PSP2 Payroll Support Program | Notes Payable, Other Payables |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 1.00% | 1.00% |
United States Department of Treasury | PSP2 Payroll Support Program | Notes Payable, Other Payables | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Forecast |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
Variable rate (as a percent) |  | 2.00% |  |  |  |  |
United States Department of Treasury | PSP3 Payroll Support Program |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
Strike price (in USD per share) | $ / shares |  |  |  |  | $ 58.51 | $ 58.51 |
Expiration period (in years) |  |  |  |  |  | 5 years |
United States Department of Treasury | PSP3 Payroll Support Program | Notes Payable, Other Payables |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 1.00% | 1.00% |
United States Department of Treasury | PSP3 Payroll Support Program | Notes Payable, Other Payables | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Forecast |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
Variable rate (as a percent) | 2.00% |  |  |  |  |  |

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