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Special Items (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Special Items [Abstract] |  |  |  |  |
Federal payroll support grant recognition | $ (186,000,000) | $ (332,000,000) | $ (830,000,000) | $ (636,000,000) |
CARES act employee retention credit | 0 | 0 | (11,000,000) | 0 |
Fleet impairment | 0 | 56,000,000 | 0 | 258,000,000 |
Severance and benefit costs | 0 | 58,000,000 | 0 | 58,000,000 |
Losses on sale-leaseback transactions | 0 | 106,000,000 | 0 | 106,000,000 | $ (106,000,000)
Special items | $ (186,000,000) | (112,000,000) | (841,000,000) | (214,000,000) |
Payments to employees |  |  | 5,000 |  |
Special Item CARES act employee retention credit |  |  | 11,000,000 |  |
Severance and benefit costs, disbursed |  | 39,000,000 |  |  |
Proceeds from sale leaseback transactions |  | 327,000,000 |  |  | 563,000,000
Proceeds from sale-leaseback transactions |  | 118,000,000 | 0 | 236,000,000 | 354,000,000
Proceeds from sale-leaseback transactions |  | $ 209,000,000 | $ 0 | $ 209,000,000 | $ 209,000,000

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