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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