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Revenue - Air Traffic Liability Rollforward (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Air Traffic Liability Roll Forward |  |
ATL, beginning balance | $ 7,133 | $ 5,510
Current Period Sales | 2,324 | 4,565
Revenue amounts in beginning balance | (743) | (1,949)
Revenue from Current Period Sales | (982) | (1,915)
ATL, ending balance | $ 7,732 | $ 6,211

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- Definition Current Period Sales + References No definition available. + Details
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Period Type: | duration

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- Definition Air Traffic Liability - Revenue amounts in beginning balance + References No definition available. + Details
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- Definition Air Traffic Liability - Revenue from Current Period Sales + References No definition available. + Details
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Namespace Prefix: | luv_
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- Definition Air Traffic Liability Roll Forward + References No definition available. + Details
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Balance Type: | na
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- Definition Air Traffic Liability Total + References No definition available. + Details
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Namespace Prefix: | luv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant