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Special Items (Details) - USD ($) |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Apr. 29, 2021 | Apr. 23, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Special Items [Abstract] |  |  |  |  |  |
Federal payroll support grant recognition |  |  | $ (357,000,000) | $ (304,000,000) | $ (644,000,000) | $ (304,000,000)
CARES act employee retention credit |  |  | (9,000,000) | 0 | (11,000,000) | 0
Special items - fleet impairment |  |  | 0 | 0 | 0 | 202,000,000
Special items |  |  | (366,000,000) | $ (304,000,000) | (655,000,000) | $ (102,000,000)
CARES act, payroll support program, total payment | $ 76,000,000 | $ 963,000,000 | 541,000,000 |  | 1,100,000,000 |
CARES act, payroll support program, grant | 53,000,000 | 704,000,000 | 409,000,000 |  | 845,000,000 |
Payments to employees |  |  |  |  | 5,000 |
Special Item CARES act employee retention credit |  |  | 9,000,000 |  | 11,000,000 |
Unsecured Debt | US Department of Treasury |  |  |  |  |  |
Special Items [Abstract] |  |  |  |  |  |
Debt instrument, face amount | $ 23,000,000 | $ 259,000,000 | $ 276,000,000 |  | $ 276,000,000 |

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