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Revenue - Air Traffic Liability Breakout (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
ATL - PAX Revenue and Ancillary PAX Services | $ 2,059 | $ 1,898 |
ATL - Loyalty Program | 3,011 | 2,667 |
Air Traffic Liability Total | $ 5,070 | $ 4,565 | $ 4,221

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- Definition 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 Air Traffic Liability Passenger Revenue and Ancillary Passenger Services + References No definition available. + Details
Name: | luv_AirTrafficLiabilityPassengerRevenueandAncillaryPassengerServices
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