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Revenue - Air Traffic Liability - Loyalty Program Rollforward (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Change in Contract With Customer, Liability [Roll Forward] |  |
Beginning balance | $ 5,189 | $ 4,789
Amounts deferred associated with points awarded | 846 | 736
Ending balance | 5,190 | 4,884
Passenger Customer |  |
Change in Contract With Customer, Liability [Roll Forward] |  |
Revenue recognized from points redeemed | (825) | (624)
Other |  |
Change in Contract With Customer, Liability [Roll Forward] |  |
Revenue recognized from points redeemed | $ (20) | $ (17)

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- Definition Change in Contract With Customer, Liability + References No definition available. + Details
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Namespace Prefix: | luv_
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Balance Type: | na
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- Definition Contract With Customer Liability, 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 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
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- Details
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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: |