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Worldwide Pandemic (Details)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended 12 Months Ended 60 Months Ended
Mar. 31, 2021
USD ($)
employees
$ / shares
shares
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Jan. 15, 2031
Dec. 31, 2021
employees
Apr. 23, 2021
USD ($)
$ / shares
shares
Mar. 11, 2021
USD ($)
Proceeds from term loan credit facility $ 0 $ 1,000          
Proceeds from Payroll Support Program 3,400            
Proceeds from Payroll Support Program Grant Received in June 2020     $ 652        
Voluntary Separation Program 2020 and Extended Emergency Time Off Total Accrued $ 611            
Number of Aircraft in Long-Term Storage 66            
Proceeds from PSP2 Payroll Support Program Extension Grant Allocated to Fund Salaries, Wages, and Benefits $ 1,200            
Proceeds from Payroll Support Program Extension $ 1,700            
Total Employees who participated in Extended Emergency Time Off During 2020 | employees 11,000            
Total Proceeds to be provided to U.S. Airlines from PSP3 Payroll Support per American Rescue Plan Act of 2021             $ 14,000
Total Employees who Participated in Extended Emergency Time Off During 2020, Who Were Still on Emergency Time Off at December 31, 2020 | employees         8,164    
Extended Emergency Time Off Accrual for Employees who Accepted through 2020     620        
Extended Emergency Time Off $ 190   393        
Voluntary Separation Program 2020 and Extended Emergency Time Off Relieved from Accrual for Employees Who Accepted Through December 31, 2020 188            
Extended Emergency Time Off Reversal for Employees who Accepted through March 31, 2021 141            
Extended Emergency Time Off Accrual for Employees who Accepted through March 31, 2021 26            
PSP3 Payroll Support Program Amount of Grant Expected to be Allocated in Third Quarter 2021 1,300            
Goodwill $ 970   $ 970        
Option to Convert to Voluntary Separation Program 2020 [Member]              
Extended Emergency Time Off Period 12 months            
Subsequent Event              
Proceeds from PSP3 Payroll Support Program per American Rescue Plan Act of 2021           $ 1,900  
Proceeds from PSP3 Payroll Support Program Grant per American Rescue Plan Act of 2021, Received in April 2021           926  
Subsequent Event | PSP2 Payroll Support Program Extension Topoff Received April 23, 2021              
Proceeds from Payroll Support Program Extension Received in April 2021           259  
Subsequent Event | Total Amount of PSP2 Payroll Support Program Extension Agreement              
Total Proceeds from Payroll Support Program Extension (PSP2)           $ 2,000  
Minimum              
Extended Emergency Time Off Period 6 months            
Minimum | Option to Convert to Voluntary Separation Program 2020 [Member]              
Extended Emergency Time Off Period 12 months            
Maximum              
Extended Emergency Time Off Period 18 months            
Pilots [Member] | Maximum              
Extended Emergency Time Off Period 5 years            
LUV Common Stock Warrants | Total Amount of PSP2 Payroll Support Program Extension Agreement              
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 46.28            
LUV Common Stock Warrants | PSP2 Payroll Support Program Extension As of March 31, 2021              
Warrants and Rights Outstanding $ 23            
LUV Common Stock Warrants | Payroll Support Program              
Class of Warrant or Right, Outstanding | shares 2,700            
Warrants and Rights Outstanding $ 40            
LUV Common Stock Warrants | Payroll Support Program Extension issued during first quarter 2021              
Class of Warrant or Right, Outstanding | shares 1,100            
LUV Common Stock Warrants | Subsequent Event | PSP2 Payroll Support Program Extension Topoff Received April 23, 2021              
Class of Warrant or Right, Outstanding | shares           168  
LUV Common Stock Warrants | Subsequent Event | Total Amount of PSP2 Payroll Support Program Extension Agreement              
Class of Warrant or Right, Outstanding | shares           1,200  
LUV Common Stock Warrants | Subsequent Event | PSP3 Payroll Support Program Extension Agreement [Member]              
Class of Warrant or Right, Outstanding | shares           424  
Warrants and Rights Outstanding           $ 9  
Common Stock | Subsequent Event | PSP3 Payroll Support Program Extension Agreement [Member]              
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares           $ 58.51  
Unsecured Debt | Forecast | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate              
Basis spread on variable rate (percent) April 21, 2025 and beyond       2.00%      
1.0 Payroll Support Program Loan due 2030 | Unsecured Debt              
Stated interest rate 1.00%            
Carrying amount of debt $ 976            
1.0 Payroll Support Program Loan due 2031 | Unsecured Debt              
Stated interest rate 1.00%            
Carrying amount of debt $ 488            
1.0 Payroll Support Program Loan due 2031 | Unsecured Debt | Subsequent Event | PSP2 Payroll Support Program Extension Topoff Received April 23, 2021              
Carrying amount of debt           $ 78  
1.0 Payroll Support Program Loan due 2031 | Unsecured Debt | Subsequent Event | Total Amount of PSP2 Payroll Support Program Extension Agreement              
Carrying amount of debt           566  
Payroll Support Program Extension Unsecured Loan | Unsecured Debt              
Stated interest rate 1.00%            
1.0 Payroll Support Program Loan due 2031 issued during first quarter 2021 | Unsecured Debt              
Carrying amount of debt $ 488            
1.0 PSP3 Payroll Support Program Loan due 2031 | Unsecured Debt | Subsequent Event              
Carrying amount of debt           $ 248