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Worldwide Pandemic (Details) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended | 60 Months Ended | 120 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) employees shares | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) employees shares | Jun. 30, 2019 USD ($) | Apr. 19, 2030 | Apr. 19, 2030 | May 29, 2020 USD ($) | Apr. 21, 2020 USD ($) | Apr. 20, 2020 USD ($) shares | Apr. 09, 2020 $ / shares | Mar. 30, 2020 USD ($) | Dec. 31, 2019 USD ($)
Proceeds from term loan credit facility | $ 2,683 | $ 0 | $ 3,683 | $ 0 |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  | 27.00% | 23.40% |  |  |  |  |  |  |  |
Total Expected Receipts of Relief Through Payroll Support Program of CARES Act |  |  |  |  |  |  |  |  | $ 3,300 |  |  |
Proceeds from Payroll Support Program Grant | 2,900 |  | $ 2,900 |  |  |  |  |  |  |  |  |
Cash Raised, Net of Fees |  |  | 17,300 |  |  |  |  |  |  |  |  |
Unsecured Term Loan Through Payroll Support Program of CARES Act |  |  |  |  |  |  |  |  | $ 459 |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  |  |  |  |  |  |  |  |  | $ 36.47 |  |
Proceeds from Payroll Support Program Grant Received in April |  |  |  |  |  |  |  | $ 1,600 |  |  |  |
Proceeds from Payroll Support Program Grant Received in May |  |  |  |  |  |  | $ 652 |  |  |  |  |
Proceeds from Payroll Support Program Grant Received in June 2020 | $ 652 |  | $ 652 |  |  |  |  |  |  |  |  |
Percent of Proceeds from Payroll Support Program Grant Received | 90.00% |  | 90.00% |  |  |  |  |  |  |  |  |
Proceeds from Payroll Support Program Grant Remaining to be Allocated to Payroll Support, Voluntary Separation, net | $ 957 |  | $ 957 |  |  |  |  |  |  |  |  | $ 0
Percent of Proceeds from Payroll Support Program Grant To be Received in July 2020 | 10.00% |  | 10.00% |  |  |  |  |  |  |  |  |
Proceeds from Payroll Support Program Grant To Be Received in July 2020 | $ 326 |  | $ 326 |  |  |  |  |  |  |  |  |
Unsecured Term Loan to be Issued Through Payroll Support Program of CARES Act | 98 |  | 98 |  |  |  |  |  |  |  |  |
Expected Eligibility Amount for Secured Loans Through CARES Act | $ 2,800 |  | $ 2,800 |  |  |  |  |  |  |  |  |
Voluntary Separation Program 2020 Participants | employees | 4,200 |  | 4,200 |  |  |  |  |  |  |  |  |
Voluntary Separation Program 2020 Accrual for Employees who Accepted through June 30, 2020 | $ 307 |  |  |  |  |  |  |  |  |  |  |
Proceeds from Payroll Support Program Grant Allocated to Payroll Support, Voluntary Separation, net | 1,100 |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 970 |  | $ 970 |  |  |  |  |  |  |  |  | $ 970
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount Increase on Unsecured Term Loan Through Payroll Support Program of CARES Act |  |  |  |  |  | 30.00% |  |  |  |  |  |
Principal Amount Increase on Warrants Issued to Treasury Through Payroll Support Program of CARES Act |  |  |  |  |  | 10.00% |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |
Extended Emergency Time Off Period | 6 months |  |  |  |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |
Extended Emergency Time Off Period | 18 months |  |  |  |  |  |  |  |  |  |  |
Customer Support and Service [Member] |  |  |  |  |  |  |  |  |  |  |  |
Voluntary Separation Program 2020 Participants | employees | 390 |  | 390 |  |  |  |  |  |  |  |  |
Ground Operations and Provisioning [Member] |  |  |  |  |  |  |  |  |  |  |  |
Voluntary Separation Program 2020 Participants | employees | 1,060 |  | 1,060 |  |  |  |  |  |  |  |  |
Flight Attendants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Voluntary Separation Program 2020 Participants | employees | 725 |  | 725 |  |  |  |  |  |  |  |  |
Pilots [Member] |  |  |  |  |  |  |  |  |  |  |  |
Voluntary Separation Program 2020 Participants | employees | 640 |  | 640 |  |  |  |  |  |  |  |  |
Pilots [Member] | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Extended Emergency Time Off Period | 5 years |  |  |  |  |  |  |  |  |  |  |
Contract groups [Member] |  |  |  |  |  |  |  |  |  |  |  |
Voluntary Separation Program 2020 Participants | employees | 90 |  | 90 |  |  |  |  |  |  |  |  |
Managerial and Administrative [Member] |  |  |  |  |  |  |  |  |  |  |  |
Voluntary Separation Program 2020 Participants | employees | 1,145 |  | 1,145 |  |  |  |  |  |  |  |  |
Maintenance [Member] |  |  |  |  |  |  |  |  |  |  |  |
Voluntary Separation Program 2020 Participants | employees | 185 |  | 185 |  |  |  |  |  |  |  |  |
LUV Common Stock Warrants |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding | shares | 2,300,000 |  | 2,300,000 |  |  |  |  |  | 1,300,000 |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  |  |  |  |  |  |  |  |  | $ 36.47 |  |
Warrants and Rights Outstanding | $ 35 |  | $ 35 |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Unissued | shares | 268,000 |  | 268,000 |  |  |  |  |  |  |  |  |
Use Rights [Member] |  |  |  |  |  |  |  |  |  |  |  |
Indefinite-Lived Domestic Slots and Routes | $ 295 |  | $ 295 |  |  |  |  |  |  |  |  |
CARES Act Unsecured Loan | Unsecured Debt |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate | 1.00% |  | 1.00% |  |  |  |  |  |  |  |  |
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% |  | 1.00% |  |  |  |  |  |  |  |  |
Carrying amount of debt | $ 850 |  | $ 850 |  |  |  |  |  |  |  |  |
Accordian Feature to Amended 364-Day Term Loan Credit Facility [Member] | Amended 364-Day Term Loan Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Accordian Feature on Short-term Debt |  |  |  |  |  |  |  |  |  |  | $ 417 |

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