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Special Items (Details) - USD ($)
 3 Months Ended
Apr. 23, 2020
Mar. 31, 2021
Mar. 31, 2020
Special Items [Abstract]      
Federal payroll support grant recognition   $ (288,000,000) $ 0
CARES act employee retention credit   (1,000,000) 0
Special items - fleet impairment   0 202,000,000
Special items   (289,000,000) $ 202,000,000
CARES act, payroll support program, total payment $ 963,000,000 504,000,000  
CARES act, payroll support program, grant 704,000,000 383,000,000  
Payments to employees   5,000  
Special Item CARES act employee retention credit   (1,000,000)  
Unsecured Debt      
Special Items [Abstract]      
CARES act, payroll support program, grant   87,000,000  
Unsecured Debt | US Department of Treasury      
Special Items [Abstract]      
Debt instrument, face amount $ 259,000,000 $ 121,000,000