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Impact of the COVID-19 Pandemic - Government Support Programs (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
1 Months Ended 2 Months Ended 3 Months Ended 9 Months Ended 60 Months Ended
Jan. 15, 2021
Jan. 31, 2021
Mar. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2030
Mar. 31, 2030
Dec. 31, 2025
Mar. 31, 2025
Impact Of Global Pandemic [Line Items]                  
Relief received through payroll support program, CARES Act         $ 5,600        
Grant payments received through payroll support program, CARES Act         4,000        
Additional liquidity through deferred payment of employer portion of social security taxes         $ 200        
Subsequent event                  
Impact Of Global Pandemic [Line Items]                  
Proceeds from payroll support program   $ 1,400              
Installment received through payroll support program $ 1,400                
Grant received as percent of total received through payroll support program 70.00%                
Unsecured loan as percent of total received through payroll support program 30.00%                
Forecast                  
Impact Of Global Pandemic [Line Items]                  
Proceeds from payroll support program     $ 1,500 $ 2,900          
Grant payments received through payroll support program       $ 2,000          
Delta Common Stock Warrants 2020                  
Impact Of Global Pandemic [Line Items]                  
Number shares called by warrants (in shares)         6.7        
Shares called by warrants as percentage of outstanding shares         1.00%        
Warrant exercise price (USD per share)         $ 24.39        
Warrants term (in years)         5 years        
Delta Common Stock Warrants 2021 | Subsequent event                  
Impact Of Global Pandemic [Line Items]                  
Number shares called by warrants (in shares) 1.0                
Delta Common Stock Warrants 2021 | Forecast                  
Impact Of Global Pandemic [Line Items]                  
Number shares called by warrants (in shares)     2.1 2.1          
Shares called by warrants as percentage of outstanding shares     0.50% 0.50%          
Warrant exercise price (USD per share)     $ 39.73 $ 39.73          
Warrants term (in years)       5 years          
Unsecured Debt | Unsecured CARES Act Payroll Support Program Loan                  
Impact Of Global Pandemic [Line Items]                  
Unsecured loan per agreement through payroll support program, CARES Act         $ 1,600        
Debt instrument term         10 years        
Unsecured Debt | Unsecured CARES Act Payroll Support Program Loan | Forecast                  
Impact Of Global Pandemic [Line Items]                  
Annual interest rate (percent)                 1.00%
Unsecured Debt | Unsecured CARES Act Payroll Support Program Loan | SOFR | Forecast                  
Impact Of Global Pandemic [Line Items]                  
Margin on rate (percent)             2.00%    
Unsecured Debt | Unsecured Payroll Support Program Loan | Subsequent event                  
Impact Of Global Pandemic [Line Items]                  
Unsecured loan per agreement through payroll support program $ 400                
Unsecured Debt | Unsecured Payroll Support Program Loan | Forecast                  
Impact Of Global Pandemic [Line Items]                  
Debt instrument term       10 years          
Annual interest rate (percent)               1.00%  
Unsecured loan per agreement through payroll support program     $ 830 $ 830          
Unsecured Debt | Unsecured Payroll Support Program Loan | SOFR | Forecast                  
Impact Of Global Pandemic [Line Items]                  
Margin on rate (percent)           2.00%