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Revenue - Air Traffic Liability Breakout (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
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Revenue Recognition and Deferred Revenue [Abstract] |  |  |  |
ATL - PAX Revenue and Ancillary PAX Services | $ 3,109 | $ 2,686 |  |
AirTrafficLiabilityLoyaltyProgram | 4,623 | 4,447 |  |
AirTrafficLiabilityTotal | $ 7,732 | $ 7,133 | $ 6,211 | $ 5,510

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- Definition Air Traffic Liability Loyalty Program + References No definition available. + Details
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- Definition Air Traffic Liability Passenger Revenue and Ancillary Passenger Services + 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 Air Traffic Liability Total + References No definition available. + Details
Name: | luv_AirTrafficLiabilityTotal
Namespace Prefix: | luv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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