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FINANCING ACTIVITIES (Details) $ / shares in Units, shares in Millions |  |  | 3 Months Ended | 9 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 05, 2020 USD ($) | May 01, 2020 USD ($) $ / shares shares | Sep. 30, 2020 USD ($) aircraft $ / shares | Jun. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) aircraft $ / shares | Sep. 30, 2019 USD ($) | Jul. 31, 2020 USD ($) | Jun. 08, 2020 USD ($) | May 04, 2020 USD ($) | Apr. 24, 2020 USD ($) | Apr. 09, 2020 $ / shares | Apr. 01, 2020 USD ($) | Mar. 30, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Required Minimum Liquidity Level at All Times After March 31, 2021 |  |  | $ 2,500,000,000 |  |  | $ 2,500,000,000 |  |  |  |  |  |  |  |
Remainder of 2020 |  |  | 543,000,000 |  |  | 543,000,000 |  |  |  |  |  |  |  |
2021 |  |  | 220,000,000 |  |  | 220,000,000 |  |  |  |  |  |  |  |
2022 |  |  | 524,000,000 |  |  | 524,000,000 |  |  |  |  |  |  |  |
2023 |  |  | 1,400,000,000 |  |  | 1,400,000,000 |  |  |  |  |  |  |  |
2024 |  |  | 152,000,000 |  |  | 152,000,000 |  |  |  |  |  |  |  |
2025 |  |  | 4,000,000,000.0 |  |  | 4,000,000,000.0 |  |  |  |  |  |  |  |
Beyond 2025 |  |  | 4,500,000,000 |  |  | 4,500,000,000 |  |  |  |  |  |  |  |
Shares Issued, Price Per Share | $ / shares |  | $ 28.50 |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | shares |  | 80.5 |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share | $ / shares |  | $ 1.00 |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale-leaseback transactions |  |  | 0 |  | $ 0 | (222,000,000) | $ 0 |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt |  |  |  | $ (392,000,000) |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of long-term debt |  |  | 1,125,000,000 |  | 0 | 5,622,000,000 | 0 |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  | $ 1,800,000,000 | $ 2,000,000,000.0 |  |  |  |
Issuance of common stock |  |  | 0 |  | 0 | 2,294,000,000 | 0 |  |  |  |  |  |  |
Proceeds from sale-leaseback transactions |  |  | 0 |  | $ 0 | 815,000,000 | $ 0 |  |  |  |  |  |  |
LUV Common Stock Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 36.47 |  |
Underwriters' Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | shares |  | 10.5 |  |  |  |  |  |  |  |  |  |  |  |
2Q20 Saleleaseback of 10 737-800 and 10 737 MAX 8 aircraft [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Operating Lease Obligations - 2021 |  |  | 71,000,000 |  |  | 71,000,000 |  |  |  |  |  |  |  |
Sale Leaseback Operating Lease Obligations - 2022 |  |  | 71,000,000 |  |  | 71,000,000 |  |  |  |  |  |  |  |
Sale Leaseback Operating Lease Obligations - 2023 |  |  | 71,000,000 |  |  | 71,000,000 |  |  |  |  |  |  |  |
Sale Leaseback Operating Lease Obligations - 2024 |  |  | 71,000,000 |  |  | 71,000,000 |  |  |  |  |  |  |  |
Sale Leaseback Operating Lease Obligations - 2025 |  |  | 71,000,000 |  |  | 71,000,000 |  |  |  |  |  |  |  |
Operating Leases, Future Minimum Payments, Remainder of Fiscal Year |  |  | 18,000,000 |  |  | 18,000,000 |  |  |  |  |  |  |  |
Operating Leases, Future Minimum Payments, Due Thereafter |  |  | $ 440,000,000 |  |  | $ 440,000,000 |  |  |  |  |  |  |  |
B-737-800 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction, Description of Asset(s) |  |  | ten |  |  |  |  |  |  |  |  |  |  |
Gain on sale-leaseback transactions |  |  | $ 153,000,000 |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction, Lease Terms |  |  | ten years |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale-leaseback transactions |  |  | $ 405,000,000 |  |  |  |  |  |  |  |  |  |  |
B-737-7 MAX |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction, Description of Asset(s) |  |  | ten |  |  |  |  |  |  |  |  |  |  |
Gain on sale-leaseback transactions |  |  | $ 69,000,000 |  |  |  |  |  |  |  |  |  |  |
Sale Leaseback Transaction, Lease Terms |  |  | 13 years |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale-leaseback transactions |  |  | $ 410,000,000 |  |  |  |  |  |  |  |  |  |  |
2.625% Notes due 2030 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 2.625% |  |  | 2.625% |  |  |  |  |  |  |  |
Unsecured Debt |  |  | $ 500,000,000 |  |  | $ 500,000,000 |  |  |  |  |  |  |  |
Amended 364-Day Term Loan Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,300,000,000 |
1.250 Convertible Senior Notes due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 1.25% |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price | $ / shares |  |  | $ 38.48 |  |  | $ 38.48 |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Ratio |  |  | 25.9909 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
Convertible Debt Conversion Terms Percentage of Sales Price Exceeding Conversion Price |  |  | 130.00% |  |  |  |  |  |  |  |  |  |  |
Convertible Debt Conversion Terms Measurement Period Trading Price Threshold Percentage |  |  | 98.00% |  |  |  |  |  |  |  |  |  |  |
4.750 Unsecured Notes due 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  | 4.75% | 4.75% |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  | $ 500,000,000 | $ 750,000,000 |  |  |  |
5.250 Unsecured Notes due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  | 5.25% |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  | $ 1,250,000,000 |  |  |  |
5.125 Unsecured Notes due 2027 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  | 5.125% |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  | $ 1,300,000,000 |  |  |  |  |
4.750 Unsecured Notes due 2023 and 5.125 Unsecured Notes due 2027 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of long-term debt |  |  | $ 1,700,000,000 |  |  |  |  |  |  |  |  |  |  |
Secured Debt by Six Aircraft [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aircraft Subject to Secure Debt Transactions | aircraft |  |  | 6 |  |  | 6 |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 192,000,000 |  |  | $ 192,000,000 |  |  |  |  |  |  |  |
364-Day Term Loan Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 1,000,000,000.0 |  |  | $ 1,000,000,000.0 |  |  |  |  |  |  |  |
Secured Debt by Four Aircraft [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aircraft Subject to Secure Debt Transactions | aircraft |  |  | 4 |  |  | 4 |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 125,000,000 |  |  | $ 125,000,000 |  |  |  |  |  |  |  |
Debt Instrument Net of fees |  |  | $ 121,000,000 |  |  | $ 121,000,000 |  |  |  |  |  |  |  |
Secured Debt by Four Aircraft [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 1.40% |  |  | 1.40% |  |  |  |  |  |  |  |
Convertible Debt [Member] | 1.250 Convertible Senior Notes due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 1.25% |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Underwriters Option to Purchase |  | $ 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt |  |  | $ (11,000,000) |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  | 5.20% |  |  | 5.20% |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 2,300,000,000 | $ 1,900,000,000 |  |  | $ 1,900,000,000 |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Carrying Amount of Equity Component |  |  | (403,000,000) |  |  | (403,000,000) |  |  |  |  |  |  |  |
Unamortized Debt Issuance Expense |  |  | 62,000,000 |  |  | 62,000,000 |  |  |  |  |  |  |  |
Carrying amount of debt |  |  | $ 1,927,000,000 |  |  | $ 1,927,000,000 |  |  |  |  |  |  |  |
Unsecured Debt | 2.625% Notes due 2030 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 2.625% |  |  | 2.625% |  |  |  |  |  |  |  |
Carrying amount of debt |  |  | $ 500,000,000 |  |  | $ 500,000,000 |  |  |  |  |  |  |  |
Unsecured Debt | 1.250 Convertible Senior Notes due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 1.25% |  |  | 1.25% |  |  |  |  |  |  |  |
Unsecured Debt | 4.750 Unsecured Notes due 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 4.75% |  |  | 4.75% |  |  |  |  |  |  |  |
Carrying amount of debt |  |  | $ 1,250,000,000 |  |  | $ 1,250,000,000 |  |  |  |  |  |  |  |
Unsecured Debt | 5.250 Unsecured Notes due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 5.25% |  |  | 5.25% |  |  |  |  |  |  |  |
Carrying amount of debt |  |  | $ 1,550,000,000 |  |  | $ 1,550,000,000 |  | $ 300,000,000 |  |  |  |  |  |
Unsecured Debt | 5.125 Notes due 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 5.125% |  |  | 5.125% |  |  |  |  |  |  |  |
Carrying amount of debt |  |  | $ 2,000,000,000 |  |  | $ 2,000,000,000 |  | 700,000,000 |  |  |  |  |  |
Unsecured Debt | 5.250 Unsecured Notes due 2025 and 5.125 Notes due 2027 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying amount of debt |  |  |  |  |  |  |  | $ 1,000,000,000.0 |  |  |  |  |  |
Unsecured Debt | 2.65% Notes due 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 2.65% |  |  | 2.65% |  |  |  |  |  |  |  |
Carrying amount of debt |  |  | $ 500,000,000 |  |  | $ 500,000,000 |  |  |  |  |  |  |  |
Unsecured Debt | 2.65% Notes due 2020 | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate | 2.65% |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Senior Debt | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 1,500,000,000 |  |  | $ 1,500,000,000 |  |  |  |  |  |  |  |
Amended 364-Day Term Loan Credit Facility | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 1.00% |  |  | 1.00% |  |  |  |  |  |  |  |
Amended 364-Day Term Loan Credit Facility | London Interbank Offered Rate (LIBOR) [Member] | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 1.00% |  |  | 1.00% |  |  |  |  |  |  |  |
Amended 364-Day Term Loan Credit Facility | New York Fed Bank Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 0.50% |  |  | 0.50% |  |  |  |  |  |  |  |
Amended 364-Day Term Loan Credit Facility | Base Rate [Member] | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 1.00% |  |  | 1.00% |  |  |  |  |  |  |  |
Accordian Feature to Amended 364-Day Term Loan Credit Facility [Member] | Amended 364-Day Term Loan Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accordian Feature on Short-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 417,000,000
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  | $ 350,000,000 |  |  |
Secured Debt by Six Aircraft [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 1.40% |  |  | 1.40% |  |  |  |  |  |  |  |
Existing Revolving Credit Facility [Member] | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  | $ 1,000,000,000.0 |  |  | $ 1,000,000,000.0 |  |  |  |  |  |  |  |
Revolving Credit Facility, Fair Value Amount Outstanding |  |  | 0 |  |  | 0 |  |  |  |  |  |  |  |
Existing Revolving Credit Facility [Member] | 364-Day Term Loan Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 1,000,000,000.0 |  |  | $ 1,000,000,000.0 |  |  |  |  |  |  |  |

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- Definition Accordian Feature on Short-term Debt + References No definition available. + Details
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- Definition Aircraft Subject to Secure Debt Transactions + References No definition available. + Details
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- Definition Convertible Debt Conversion Terms Measurement Period Trading Price Threshold Percentage + References No definition available. + Details
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- Definition Convertible Debt Conversion Terms Percentage of Sales Price Exceeding Conversion Price + References No definition available. + Details
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- Definition Debt Instrument Net of fees + References No definition available. + Details
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- Definition Debt Instrument Underwriters Option to Purchase + References No definition available. + Details
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- Definition Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal Thereafter + References No definition available. + Details
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- Definition Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Six + References No definition available. + Details
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- Definition Operating Leases, Future Minimum Payments, Due Thereafter Year 6 + References No definition available. + Details
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- Definition Operating Leases Future Minimum Payments Due in Six Years + References No definition available. + Details
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- Definition Required Minimum Liquidity Level at All Times After March 31, 2021 + References No definition available. + Details
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- Definition Sale Leaseback Cash Proceeds Investing + References No definition available. + Details
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- Definition Adjustment to additional paid in capital resulting from the recognition of convertible debt instruments as two separate components - a debt component and an equity component. This bifurcation may result in a basis difference associated with the liability component that represents a temporary difference for purposes of applying accounting for income taxes. The initial recognition of deferred taxes for the tax effect of that temporary difference is as an adjustment to additional paid in capital. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 25 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=51819886&loc=SL6014347-161799 + Details
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