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STOCK PLANS - Employee Stock Purchase Plan Activity (Details) - $ / shares shares in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Share-Based Payment Arrangement [Abstract] |  |  |
Total number of shares purchased (in shares) | 1,453 | 1,083 | 1,386
Average price paid per share (in USD per share) | $ 36.10 | $ 47.31 | $ 34.39
Weighted-average fair value of each purchase right under the ESPP (in USD per share) | $ 4.02 | $ 5.19 | $ 3.82

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- Definition This element represents the value of the discount applied to the market value for shares available to participating employees under the employee stock purchase plan. + References No definition available. + Details
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Namespace Prefix: | luv_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents the weighted average fair value of each purchase right under the employee stock purchase plan. + References No definition available. + Details
Name: | luv_WeightedAverageFairValueOfStockPurchaseRightUnderEmployeeStockPurchasePlan
Namespace Prefix: | luv_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

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

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- Definition Number of shares issued during the period as a result of an employee stock purchase plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI https://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration