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Revenue - Air Traffic Liability - Loyalty Program Rollforward (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Change in Contract With Customer, Liability [Roll Forward] |  |  |  |
Beginning balance | $ 4,693 | $ 4,962 | $ 4,849 | $ 4,916
Amounts deferred associated with points awarded | 649 | 851 | 2,214 | 2,645
Ending balance | 4,505 | 4,886 | 4,505 | 4,886
Passenger Customer |  |  |  |
Change in Contract With Customer, Liability [Roll Forward] |  |  |  |
Revenue recognized from points redeemed | (805) | (896) | (2,475) | (2,589)
Other |  |  |  |
Change in Contract With Customer, Liability [Roll Forward] |  |  |  |
Revenue recognized from points redeemed | $ (32) | $ (31) | $ (83) | $ (86)

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- Definition Change in Contract With Customer, Liability + References No definition available. + Details
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- Definition Contract With Customer Liability, Air Traffic Liability, Loyalty Program + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Contract With Customer Liability, Air Traffic Liability, Loyalty Program, Awarded Points + References No definition available. + Details
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Namespace Prefix: | luv_
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- Definition Contract With Customer, Liability, Loyalty Program, Revenue Recognized + References No definition available. + Details
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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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