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Worldwide Pandemic - Narrative (Details) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended | 14 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2022 USD ($) employee $ / shares | Jun. 01, 2020 employee | Mar. 31, 2022 employee | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) employee $ / shares | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) | Jun. 30, 2021 USD ($)
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |
Employees who elected conversion in extended emergency time off | employee |  |  | 0 |  |  |  |  |
COVID - 19 |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |
Voluntary separation program 2020 participants | employee | 4,200 |  |  |  | 4,200 |  |  |
Number of employees who participated in extended emergency time off during 2020 | employee |  | 12,000 |  |  |  |  |  |
Extended emergency time off accrual for employees who accepted through 2020 | $ 269 |  |  |  | $ 60 |  | $ 1,400 |
Extended emergency time off reversal for employees who accepted through March 31, 2021 |  |  |  |  |  | $ 130 |  |
Grant |  |  |  | $ 724 |  | $ 1,900 |  |
COVID - 19 | Minimum |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |
Extended emergency time off, period |  | 6 months |  |  |  |  |  |
COVID - 19 | Maximum |  |  |  |  |  |  |  |
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 | COVID - 19 |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |
Grant |  |  |  |  |  |  |  | $ 5,040
United States Department of Treasury | PSP1 |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |
Strike price (in USD per share) | $ / shares | $ 36.47 |  |  |  | $ 36.47 |  |  |
Grant |  |  |  |  |  |  |  | 2,337
United States Department of Treasury | PSP2 |  |  |  |  |  |  |  |
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 |  |  |
Grant |  |  |  |  |  |  |  | 1,393
United States Department of Treasury | PSP3 |  |  |  |  |  |  |  |
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 |  |  |
Grant |  |  |  |  |  |  |  | $ 1,310

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