3.26.3 html 251 261 1 true 74 0 false 8 false false R1.htm 0000001 - Document - Cover Sheet http://www.southwest.com/role/Cover Cover Cover 1 false false R2.htm 9952151 - Statement - Condensed Consolidated Balance Sheet Sheet http://www.southwest.com/role/CondensedConsolidatedBalanceSheet Condensed Consolidated Balance Sheet Statements 2 false false R3.htm 9952152 - Statement - Condensed Consolidated Statement of Comprehensive Income Sheet http://www.southwest.com/role/CondensedConsolidatedStatementofComprehensiveIncome Condensed Consolidated Statement of Comprehensive Income Statements 3 false false R4.htm 9952153 - Statement - Condensed Consolidated Statement of Stockholders' Equity Sheet http://www.southwest.com/role/CondensedConsolidatedStatementofStockholdersEquity Condensed Consolidated Statement of Stockholders' Equity Statements 4 false false R5.htm 9952154 - Statement - Condensed Consolidated Statement of Stockholders' Equity (Parenthetical) Sheet http://www.southwest.com/role/CondensedConsolidatedStatementofStockholdersEquityParenthetical Condensed Consolidated Statement of Stockholders' Equity (Parenthetical) Statements 5 false false R6.htm 9952155 - Statement - Condensed Consolidated Statement of Cash Flows Sheet http://www.southwest.com/role/CondensedConsolidatedStatementofCashFlows Condensed Consolidated Statement of Cash Flows Statements 6 false false R7.htm 9952156 - Disclosure - Basis of Presentation Sheet http://www.southwest.com/role/BasisofPresentation Basis of Presentation Notes 7 false false R8.htm 9952157 - Disclosure - New Accounting Pronouncements Sheet http://www.southwest.com/role/NewAccountingPronouncements New Accounting Pronouncements Notes 8 false false R9.htm 9952158 - Disclosure - Financial Derivative Instruments Sheet http://www.southwest.com/role/FinancialDerivativeInstruments Financial Derivative Instruments Notes 9 false false R10.htm 9952159 - Disclosure - Comprehensive Income Sheet http://www.southwest.com/role/ComprehensiveIncome Comprehensive Income Notes 10 false false R11.htm 9952160 - Disclosure - Revenue Sheet http://www.southwest.com/role/Revenue Revenue Notes 11 false false R12.htm 9952161 - Disclosure - Net Income Per Share Sheet http://www.southwest.com/role/NetIncomePerShare Net Income Per Share Notes 12 false false R13.htm 9952162 - Disclosure - Fair Value Measurements Sheet http://www.southwest.com/role/FairValueMeasurements Fair Value Measurements Notes 13 false false R14.htm 9952163 - Disclosure - Supplemental Financial Information Sheet http://www.southwest.com/role/SupplementalFinancialInformation Supplemental Financial Information Notes 14 false false R15.htm 9952164 - Disclosure - Commitments and Contingencies Sheet http://www.southwest.com/role/CommitmentsandContingencies Commitments and Contingencies Notes 15 false false R16.htm 9952165 - Disclosure - FINANCING ACTIVITIES Sheet http://www.southwest.com/role/FINANCINGACTIVITIES FINANCING ACTIVITIES Notes 16 false false R17.htm 995445 - Disclosure - Insider Trading Arrangements Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements Insider Trading Arrangements Notes 17 false false R18.htm 9955511 - Disclosure - New Accounting Pronouncements (Policies) Sheet http://www.southwest.com/role/NewAccountingPronouncementsPolicies New Accounting Pronouncements (Policies) Policies http://www.southwest.com/role/NewAccountingPronouncements 18 false false R19.htm 9955512 - Disclosure - Basis of Presentation (Tables) Sheet http://www.southwest.com/role/BasisofPresentationTables Basis of Presentation (Tables) Tables http://www.southwest.com/role/BasisofPresentation 19 false false R20.htm 9955513 - Disclosure - Financial Derivative Instruments (Tables) Sheet http://www.southwest.com/role/FinancialDerivativeInstrumentsTables Financial Derivative Instruments (Tables) Tables http://www.southwest.com/role/FinancialDerivativeInstruments 20 false false R21.htm 9955514 - Disclosure - Comprehensive Income (Tables) Sheet http://www.southwest.com/role/ComprehensiveIncomeTables Comprehensive Income (Tables) Tables http://www.southwest.com/role/ComprehensiveIncome 21 false false R22.htm 9955515 - Disclosure - Revenue (Tables) Sheet http://www.southwest.com/role/RevenueTables Revenue (Tables) Tables http://www.southwest.com/role/Revenue 22 false false R23.htm 9955516 - Disclosure - Net Income Per Share (Tables) Sheet http://www.southwest.com/role/NetIncomePerShareTables Net Income Per Share (Tables) Tables http://www.southwest.com/role/NetIncomePerShare 23 false false R24.htm 9955517 - Disclosure - Fair Value Measurements (Tables) Sheet http://www.southwest.com/role/FairValueMeasurementsTables Fair Value Measurements (Tables) Tables http://www.southwest.com/role/FairValueMeasurements 24 false false R25.htm 9955518 - Disclosure - Supplemental Financial Information (Tables) Sheet http://www.southwest.com/role/SupplementalFinancialInformationTables Supplemental Financial Information (Tables) Tables http://www.southwest.com/role/SupplementalFinancialInformation 25 false false R26.htm 9955519 - Disclosure - Commitments and Contingencies (Tables) Sheet http://www.southwest.com/role/CommitmentsandContingenciesTables Commitments and Contingencies (Tables) Tables http://www.southwest.com/role/CommitmentsandContingencies 26 false false R27.htm 9955520 - Disclosure - Basis of Presentation - Narrative (Details) Sheet http://www.southwest.com/role/BasisofPresentationNarrativeDetails Basis of Presentation - Narrative (Details) Details 27 false false R28.htm 9955521 - Disclosure - Basis of Presentation - Schedule of Change in Accounting Estimate (Details) Sheet http://www.southwest.com/role/BasisofPresentationScheduleofChangeinAccountingEstimateDetails Basis of Presentation - Schedule of Change in Accounting Estimate (Details) Details 28 false false R29.htm 9955522 - Disclosure - Financial Derivative Instruments - Schedule of Amounts Reclassified Out of Accumulated Other Comprehensive Income (Details) Sheet http://www.southwest.com/role/FinancialDerivativeInstrumentsScheduleofAmountsReclassifiedOutofAccumulatedOtherComprehensiveIncomeDetails Financial Derivative Instruments - Schedule of Amounts Reclassified Out of Accumulated Other Comprehensive Income (Details) Details 29 false false R30.htm 9955523 - Disclosure - Financial Derivative Instruments - Schedule of (Gain) Loss by Hedging Relationship (Details) Sheet http://www.southwest.com/role/FinancialDerivativeInstrumentsScheduleofGainLossbyHedgingRelationshipDetails Financial Derivative Instruments - Schedule of (Gain) Loss by Hedging Relationship (Details) Details 30 false false R31.htm 9955524 - Disclosure - Financial Derivative Instruments - Narrative (Details) Sheet http://www.southwest.com/role/FinancialDerivativeInstrumentsNarrativeDetails Financial Derivative Instruments - Narrative (Details) Details 31 false false R32.htm 9955525 - Disclosure - Financial Derivative Instruments - Schedule of Fair Values by Balance Sheet Location (Details) Sheet http://www.southwest.com/role/FinancialDerivativeInstrumentsScheduleofFairValuesbyBalanceSheetLocationDetails Financial Derivative Instruments - Schedule of Fair Values by Balance Sheet Location (Details) Details 32 false false R33.htm 9955526 - Disclosure - Comprehensive Income - Schedule of Components of Net Income and Comprehensive Income (Details) Sheet http://www.southwest.com/role/ComprehensiveIncomeScheduleofComponentsofNetIncomeandComprehensiveIncomeDetails Comprehensive Income - Schedule of Components of Net Income and Comprehensive Income (Details) Details 33 false false R34.htm 9955527 - Disclosure - Comprehensive Income - Schedule of AOCI Components (Details) Sheet http://www.southwest.com/role/ComprehensiveIncomeScheduleofAOCIComponentsDetails Comprehensive Income - Schedule of AOCI Components (Details) Details 34 false false R35.htm 9955528 - Disclosure - Comprehensive Income - Schedule of Reclassifications (Details) Sheet http://www.southwest.com/role/ComprehensiveIncomeScheduleofReclassificationsDetails Comprehensive Income - Schedule of Reclassifications (Details) Details 35 false false R36.htm 9955529 - Disclosure - Revenue - Passenger Revenue Breakout (Details) Sheet http://www.southwest.com/role/RevenuePassengerRevenueBreakoutDetails Revenue - Passenger Revenue Breakout (Details) Details 36 false false R37.htm 9955530 - Disclosure - Revenue - Total Other Revenues (Details) Sheet http://www.southwest.com/role/RevenueTotalOtherRevenuesDetails Revenue - Total Other Revenues (Details) Details 37 false false R38.htm 9955531 - Disclosure - Revenue - Air Traffic Liability Breakout (Details) Sheet http://www.southwest.com/role/RevenueAirTrafficLiabilityBreakoutDetails Revenue - Air Traffic Liability Breakout (Details) Details 38 false false R39.htm 9955532 - Disclosure - Revenue - Air Traffic Liability - Loyalty Program Rollforward (Details) Sheet http://www.southwest.com/role/RevenueAirTrafficLiabilityLoyaltyProgramRollforwardDetails Revenue - Air Traffic Liability - Loyalty Program Rollforward (Details) Details 39 false false R40.htm 9955533 - Disclosure - Revenue - Air Traffic Liability Rollforward (Details) Sheet http://www.southwest.com/role/RevenueAirTrafficLiabilityRollforwardDetails Revenue - Air Traffic Liability Rollforward (Details) Details 40 false false R41.htm 9955534 - Disclosure - Revenue - Narrative (Details) Sheet http://www.southwest.com/role/RevenueNarrativeDetails Revenue - Narrative (Details) Details 41 false false R42.htm 9955535 - Disclosure - Net Income Per Share - Narrative (Details) Sheet http://www.southwest.com/role/NetIncomePerShareNarrativeDetails Net Income Per Share - Narrative (Details) Details 42 false false R43.htm 9955536 - Disclosure - Net Income Per Share - Schedule of Net Income Per Share (Details) Sheet http://www.southwest.com/role/NetIncomePerShareScheduleofNetIncomePerShareDetails Net Income Per Share - Schedule of Net Income Per Share (Details) Details 43 false false R44.htm 9955537 - Disclosure - Fair Value Measurements - Measured on Recurring Basis (Details) Sheet http://www.southwest.com/role/FairValueMeasurementsMeasuredonRecurringBasisDetails Fair Value Measurements - Measured on Recurring Basis (Details) Details 44 false false R45.htm 9955538 - Disclosure - Fair Value Measurements - Carrying and Estimated Fair Value of Debt (Details) Sheet http://www.southwest.com/role/FairValueMeasurementsCarryingandEstimatedFairValueofDebtDetails Fair Value Measurements - Carrying and Estimated Fair Value of Debt (Details) Details 45 false false R46.htm 9955539 - Disclosure - Supplemental Financial Information - Accounts and Other Receivables (Details) Sheet http://www.southwest.com/role/SupplementalFinancialInformationAccountsandOtherReceivablesDetails Supplemental Financial Information - Accounts and Other Receivables (Details) Details 46 false false R47.htm 9955540 - Disclosure - Supplemental Financial Information - Other Assets (Details) Sheet http://www.southwest.com/role/SupplementalFinancialInformationOtherAssetsDetails Supplemental Financial Information - Other Assets (Details) Details 47 false false R48.htm 9955541 - Disclosure - Supplemental Financial Information - Accounts Payable (Details) Sheet http://www.southwest.com/role/SupplementalFinancialInformationAccountsPayableDetails Supplemental Financial Information - Accounts Payable (Details) Details 48 false false R49.htm 9955542 - Disclosure - Supplemental Financial Information - Accrued Liabilities (Details) Sheet http://www.southwest.com/role/SupplementalFinancialInformationAccruedLiabilitiesDetails Supplemental Financial Information - Accrued Liabilities (Details) Details 49 false false R50.htm 9955543 - Disclosure - Supplemental Financial Information - Other Non-Current Liabilities (Details) Sheet http://www.southwest.com/role/SupplementalFinancialInformationOtherNonCurrentLiabilitiesDetails Supplemental Financial Information - Other Non-Current Liabilities (Details) Details 50 false false R51.htm 9955544 - Disclosure - Commitments and Contingencies - Narrative (Details) Sheet http://www.southwest.com/role/CommitmentsandContingenciesNarrativeDetails Commitments and Contingencies - Narrative (Details) Details 51 false false R52.htm 9955545 - Disclosure - Commitments and Contingencies - Schedule of Firm Orders (Details) Sheet http://www.southwest.com/role/CommitmentsandContingenciesScheduleofFirmOrdersDetails Commitments and Contingencies - Schedule of Firm Orders (Details) Details 52 false false R53.htm 9955546 - Disclosure - Commitments and Contingencies - Schedule of Capital Commitments (Details) Sheet http://www.southwest.com/role/CommitmentsandContingenciesScheduleofCapitalCommitmentsDetails Commitments and Contingencies - Schedule of Capital Commitments (Details) Details 53 false false R54.htm 9955547 - Disclosure - FINANCING ACTIVITIES (Details) Sheet http://www.southwest.com/role/FINANCINGACTIVITIESDetails FINANCING ACTIVITIES (Details) Details http://www.southwest.com/role/FINANCINGACTIVITIES 54 false false All Reports Book All Reports luv-20260930.htm luv-20260930.xsd luv-20260930_cal.xml luv-20260930_def.xml luv-20260930_lab.xml luv-20260930_pre.xml luv-20260930_g1.jpg http://fasb.org/us-gaap/2026 http://xbrl.sec.gov/dei/2026 http://xbrl.sec.gov/ecd/2026 true true