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Revenue - Air Traffic Liability - Loyalty Program Rollforward (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Movement in Deferred Revenue |  |
Air traffic liability - loyalty program - beginning balance | $ 2,667 | $ 2,485
Amounts deferred associated with points awarded | 2,717 | 2,485
Revenue recognized from points redeemed - Passenger | (2,307) | (2,263)
Revenue recognized from points redeemed - Other | (66) | (40)
Air traffic liability - loyalty program - ending balance | $ 3,011 | $ 2,667

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- Definition Other Revenue Recognized From Points Redeemed + References No definition available. + Details
Name: | luv_OtherRevenueRecognizedFromPointsRedeemed
Namespace Prefix: | luv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Passenger Revenue Recognized From Points Redeemed + References No definition available. + Details
Name: | luv_PassengerRevenueRecognizedFromPointsRedeemed
Namespace Prefix: | luv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Revenue Amounts Deferred Associated With Points Awarded + References No definition available. + Details
Name: | luv_RevenueAmountsDeferredAssociatedWithPointsAwarded
Namespace Prefix: | luv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. + References No definition available. + Details
Name: | us-gaap_DeferredRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_MovementInDeferredRevenueRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration