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Basis of Presentation (Details) $ in Millions |  | 3 Months Ended
--- | --- | ---
Dec. 31, 2022 flight | Mar. 31, 2023 USD ($)
Accounting Policies [Abstract] |  |
Number of cancelled flights (more than) | flight | 16,700 |
Customer reimbursements other expenses | $ |  | $ 55

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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Number of Cancelled Flights + References No definition available. + Details
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Namespace Prefix: | luv_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration