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REVENUE - Air Traffic Liability - Loyalty Program Rollforward (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Air Traffic Liability [Roll Forward] |  |
Air traffic liability - loyalty program - beginning balance | $ 4,916 | $ 5,189
Amounts deferred associated with points awarded | 3,532 | 3,466
Air traffic liability - loyalty program - ending balance | 4,849 | 4,916
Passenger |  |
Air Traffic Liability [Roll Forward] |  |
Revenue recognized from points redeemed | (3,484) | (3,639)
Other |  |
Air Traffic Liability [Roll Forward] |  |
Revenue recognized from points redeemed | $ (115) | $ (100)

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- Definition Air Traffic Liability + References No definition available. + Details
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Balance Type: | na
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- Definition Contract With Customer Liability, Air Traffic Liability, Loyalty Program + References No definition available. + Details
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Namespace Prefix: | luv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Contract With Customer, Liability, Loyalty Program, Revenue Recognized + References No definition available. + Details
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Namespace Prefix: | luv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_MajorCustomersAxis=us-gaap_OtherCustomerMember
Namespace Prefix: |
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Balance Type: |
Period Type: |