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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