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Debt - Narrative (Details) - USD ($)
$ / shares in Units, shares in Millions
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 60 Months Ended
Feb. 28, 2022
Jul. 31, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2021
Jun. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Mar. 31, 2031
Dec. 31, 2030
Mar. 31, 2026
Dec. 31, 2025
Debt Instrument [Line Items]                          
Fair value         $ 26,900,000,000   $ 26,900,000,000 $ 29,800,000,000          
Government grant warrant issuance             86,000,000 114,000,000          
Aggregate cash tender offer for settlement of debt   $ 1,000,000,000                      
Loss on extinguishment of debt             319,000,000 8,000,000 $ 0        
Outstanding letters of credit that do not affect availability of revolvers         300,000,000   300,000,000            
Revolving Credit Facility                          
Debt Instrument [Line Items]                          
Proceeds from revolving credit facilities         2,900,000,000   2,900,000,000            
2020 Term Loan | Secured Debt                          
Debt Instrument [Line Items]                          
Total principal               $ 1,500,000,000          
Loss on extinguishment of debt       $ 56,000,000                  
EETC | Secured Debt                          
Debt Instrument [Line Items]                          
Repayment of debt     $ 450,000,000                    
Loss on extinguishment of debt     $ 26,000,000                    
2025 and 2026 Notes | Secured and unsecured debt                          
Debt Instrument [Line Items]                          
Loss on extinguishment of debt   $ 166,000,000                      
2025 Notes | Secured Debt                          
Debt Instrument [Line Items]                          
Interest rate per annum (percent)   7.00%                      
Principal amount of repurchased debt   $ 677,000,000                      
Payment for repurchase of debt   $ 800,000,000                      
2026 Notes | Unsecured Debt                          
Debt Instrument [Line Items]                          
Interest rate per annum (percent)   7.375%                      
Principal amount of repurchased debt   $ 169,000,000                      
Payment for repurchase of debt   $ 200,000,000                      
2025 SkyMiles Notes | Secured Debt                          
Debt Instrument [Line Items]                          
Interest rate per annum (percent)   4.50%                      
Certificates, Unsecured notes, and SkyMiles Term Loan | Secured and unsecured debt                          
Debt Instrument [Line Items]                          
Payment for repurchase of debt         647,000,000                
Loss on extinguishment of debt         71,000,000                
3.625% notes | Unsecured Debt | Forecast                          
Debt Instrument [Line Items]                          
Interest rate per annum (percent) 3.625%                        
Payment for repurchase of debt $ 1,000,000,000                        
SkyMiles program                          
Debt Instrument [Line Items]                          
Minimum liquidity covenant         2,000,000,000   2,000,000,000            
Aggregate limit on sale of pre-paid miles covenant         $ 550,000,000   $ 550,000,000            
PSP2                          
Debt Instrument [Line Items]                          
Proceeds from payroll support program           $ 3,290,000,000              
Grant payments received through payroll support program           $ 2,333,000,000              
PSP2 | PSP2 Warrants                          
Debt Instrument [Line Items]                          
Number shares called by warrants (in shares)     2.4   2.4 2.4 2.4            
Warrant exercise price (USD per share)     $ 39.73     $ 39.73              
Government grant warrant issuance           $ 52,000,000              
PSP2 | Payroll Support Program Extension | Unsecured Debt                          
Debt Instrument [Line Items]                          
Proceeds from unsecured loan           $ 957,000,000              
Debt instrument term           10 years              
Fair value     $ 905,000,000     $ 905,000,000              
PSP2 | Payroll Support Program Extension | Unsecured Debt | Forecast                          
Debt Instrument [Line Items]                          
Annual interest rate (percent)                         1.00%
PSP2 | Payroll Support Program Extension | Unsecured Debt | SOFR | Forecast                          
Debt Instrument [Line Items]                          
Margin on rate (percent)                     2.00%    
PSP3                          
Debt Instrument [Line Items]                          
Proceeds from payroll support program     3,069,000,000                    
Grant payments received through payroll support program     $ 2,178,000,000                    
PSP3 | PSP3 Warrants                          
Debt Instrument [Line Items]                          
Number shares called by warrants (in shares)     1.9   1.9 1.9 1.9            
Warrant exercise price (USD per share)     $ 47.80     $ 47.80              
Warrants term (in years)     5 years                    
Government grant warrant issuance     $ 34,000,000                    
PSP3 | Payroll Support Program 3 | Unsecured Debt                          
Debt Instrument [Line Items]                          
Proceeds from unsecured loan     $ 891,000,000                    
Debt instrument term     10 years                    
Fair value     $ 857,000,000     $ 857,000,000              
PSP3 | Payroll Support Program 3 | Unsecured Debt | Forecast                          
Debt Instrument [Line Items]                          
Annual interest rate (percent)                       1.00%  
PSP3 | Payroll Support Program 3 | Unsecured Debt | SOFR | Forecast                          
Debt Instrument [Line Items]                          
Margin on rate (percent)                   2.00%