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Revenue - Air Traffic Liability Breakout (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2018
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Revenue Recognition and Deferred Revenue [Abstract] |  |  |  |
ATL - PAX Revenue and Ancillary PAX Services | $ 2,907 | $ 2,125 |  |
AirTrafficLiabilityLoyaltyProgram | 4,187 | 3,385 |  |
AirTrafficLiabilityTotal | $ 7,094 | $ 5,510 | $ 5,966 | $ 5,070

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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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Namespace Prefix: | us-gaap_
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