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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 |

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