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REVENUE - Air Traffic Liability - Loyalty Program Rollforward (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Air traffic liability |  |
Beginning balance | $ 4,447 | $ 3,385
Amounts deferred associated with points awarded | 2,523 | 1,958
Unused funds converted to loyalty points | 0 | 167
Ending balance | 4,789 | 4,447
Passenger Customer |  |
Air traffic liability |  |
Revenue recognized from points redeemed | (2,136) | (1,003)
Other |  |
Air traffic liability |  |
Revenue recognized from points redeemed | $ (45) | $ (60)

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- Definition Air Traffic Liability + References No definition available. + Details
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Namespace Prefix: | luv_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Contract With Customer Liability, Air Traffic Liability, Loyalty Program + References No definition available. + Details
Name: | luv_ContractWithCustomerLiabilityAirTrafficLiabilityLoyaltyProgram
Namespace Prefix: | luv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Contract With Customer Liability, Air Traffic Liability, Loyalty Program, Awarded Points + References No definition available. + Details
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Namespace Prefix: | luv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Contract With Customer, Liability, Loyalty Program, Revenue Recognized + References No definition available. + Details
Name: | luv_ContractWithCustomerLiabilityLoyaltyProgramRevenueRecognized
Namespace Prefix: | luv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Unused funds converted to loyalty points + References No definition available. + Details
Name: | luv_UnusedFundsConvertedToLoyaltyPoints
Namespace Prefix: | luv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | srt_MajorCustomersAxis=luv_PassengerCustomersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_MajorCustomersAxis=us-gaap_OtherCustomerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |