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Debt - Narrative (Details)
shares in Millions
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Oct. 13, 2020
USD ($)
Sep. 30, 2020
USD ($)
shares
Apr. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
shares
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
shares
Sep. 30, 2020
USD ($)
aircraft
shares
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]                      
CARES Act warrant issuance         $ 14,000,000 $ 100,000,000          
Proceeds from issuance of debt                 $ 22,481,000,000 $ 500,000,000  
Outstanding letters of credit that reduce availability under revolvers   $ 300,000,000     300,000,000     $ 300,000,000 300,000,000    
Outstanding letters of credit that do not affect availability of revolvers   $ 300,000,000     300,000,000     $ 300,000,000 300,000,000    
Additional Paid-In Capital                      
Debt Instrument [Line Items]                      
CARES Act warrant issuance         $ 14,000,000 100,000,000     $ 114,000,000    
Delta Common Stock Warrants                      
Debt Instrument [Line Items]                      
Number shares called by warrants (in shares) | shares   6.7     6.7     6.7 6.7    
Revolving Credit Facility                      
Debt Instrument [Line Items]                      
Proceeds from revolving credit facilities             $ 3,000,000,000.0        
Repayments of revolving credit facilities         $ 400,000,000            
Undrawn credit facilities   $ 25,000,000     $ 25,000,000     $ 25,000,000 $ 25,000,000    
Revolving Credit Facility | Subsequent event                      
Debt Instrument [Line Items]                      
Repayments of revolving credit facilities $ 2,600,000,000                    
Undrawn credit facilities $ 2,600,000,000                    
2020 Unsecured Notes | Unsecured Debt                      
Debt Instrument [Line Items]                      
Debt instrument amount           $ 1,300,000,000          
Interest rate per annum (percent)           7.375%          
Unsecured CARES Act Payroll Support Program Loan | Unsecured Debt                      
Debt Instrument [Line Items]                      
Interest rate per annum (percent)   1.00%     1.00%     1.00% 1.00%    
Unsecured loan per agreement through payroll support program, CARES Act   $ 1,600,000,000     $ 1,600,000,000     $ 1,600,000,000 $ 1,600,000,000    
Relative fair value basis   1,500,000,000     1,500,000,000     $ 1,500,000,000 1,500,000,000    
Debt instrument term               10 years      
Aggregate principal amount   1,648,000,000     1,648,000,000     $ 1,648,000,000 1,648,000,000   $ 0
SkyMiles Notes due 2025 | Secured Debt                      
Debt Instrument [Line Items]                      
Debt instrument amount   $ 2,500,000,000     $ 2,500,000,000     $ 2,500,000,000 $ 2,500,000,000    
Interest rate per annum (percent)   450.00%     450.00%     450.00% 450.00%    
SkyMiles Notes due 2028 | Secured Debt                      
Debt Instrument [Line Items]                      
Debt instrument amount   $ 3,500,000,000     $ 3,500,000,000     $ 3,500,000,000 $ 3,500,000,000    
Interest rate per annum (percent)   4.75%     4.75%     4.75% 4.75%    
SkyMiles Term Loan | Secured Debt                      
Debt Instrument [Line Items]                      
Debt instrument amount   $ 3,000,000,000.0     $ 3,000,000,000.0     $ 3,000,000,000.0 $ 3,000,000,000.0    
Interest rate per annum (percent)   4.75%     4.75%     4.75% 4.75%    
LIBOR minimum per annum (percent)   1.00%                  
Aggregate principal amount   $ 3,000,000,000     $ 3,000,000,000     $ 3,000,000,000 $ 3,000,000,000   0
SkyMiles Term Loan | Secured Debt | LIBOR                      
Debt Instrument [Line Items]                      
Margin on rate (percent)   3.75%                  
2020 Senior Secured Notes | Secured Debt                      
Debt Instrument [Line Items]                      
Debt instrument amount           $ 3,500,000,000          
Interest rate per annum (percent)   7.00%     7.00% 7.00%   7.00% 7.00%    
Aggregate principal amount   $ 3,500,000,000     $ 3,500,000,000     $ 3,500,000,000 $ 3,500,000,000   0
2020 Term Loan | Secured Debt                      
Debt Instrument [Line Items]                      
Debt instrument amount           $ 1,500,000,000          
Interest rate per annum (percent)   5.75%     5.75%     5.75% 5.75%    
Required payments per year (percent)           1.00%          
Aggregate principal amount   $ 1,496,000,000     $ 1,496,000,000     $ 1,496,000,000 $ 1,496,000,000   0
2018 Revolving Credit Facility | Revolving Credit Facility                      
Debt Instrument [Line Items]                      
Interest rate per annum (percent)   3.75%     3.75%     3.75% 3.75%    
Revolving credit subject to extended maturity           $ 1,300,000,000          
Aggregate principal amount   $ 2,350,000,000     $ 2,350,000,000     $ 2,350,000,000 $ 2,350,000,000   0
2020 Secured Term Loan Facility | Secured Term Loan                      
Debt Instrument [Line Items]                      
Debt instrument amount     $ 3,000,000,000.0 $ 2,700,000,000     $ 2,700,000,000        
Debt instrument term             364 days        
Pass Through Certificates Series 2020-1 | Secured Debt                      
Debt Instrument [Line Items]                      
Debt instrument amount   1,135,000,000     1,135,000,000     1,135,000,000 $ 1,135,000,000    
Proceeds from issuance of debt     $ 135,000,000 $ 1,000,000,000.0              
Number of aircraft to secure debt | aircraft                 33    
Pass Through Certificates 2019-1 Class B | Secured Debt                      
Debt Instrument [Line Items]                      
Interest rate per annum (percent)           8.00%          
Proceeds from issuance of debt           $ 108,000,000          
NYTDC Special Facilities Revenue Bonds, Series 2020 | Bonds                      
Debt Instrument [Line Items]                      
Proceeds from issuance of debt         1,500,000,000            
Aggregate principal amount   1,511,000,000     1,511,000,000     1,511,000,000 $ 1,511,000,000   $ 0
Credit facilities and SkyMiles financing agreements                      
Debt Instrument [Line Items]                      
Minimum liquidity covenant   2,000,000,000.0     2,000,000,000.0     2,000,000,000.0 2,000,000,000.0    
SkyMiles program                      
Debt Instrument [Line Items]                      
Aggregate limit on sale of pre-paid miles covenant   $ 550,000,000     550,000,000     $ 550,000,000 $ 550,000,000    
SkyMiles program | Secured Debt                      
Debt Instrument [Line Items]                      
Proceeds from issuance of debt         $ 9,000,000,000.0