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Summary of Significant Accounting Policies (Details) (USD $) | 12 Months Ended | 3 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2012 | Dec. 31, 2014
Accounting Policies [Abstract] |  |  |  |  |  |  |  |
Prior Period Reclassification Adjustment |  |  | $ (14,000,000)us-gaap_PriorPeriodReclassificationAdjustment |  |  |  |  |
Inventory reserve for obsolescence | 46,000,000 us-gaap_InventoryValuationReserves |  | 36,000,000 us-gaap_InventoryValuationReserves |  |  |  | 46,000,000 us-gaap_InventoryValuationReserves |
The percentage of the amount received per flight segment sold that relate to free travel-SWA (in hundredths) | 100.00%luv_FundsRelatedToFreeTravelPercentageSW |  |  |  |  |  |  |
Frequent flyer points and flight credits liability | 1,300,000,000 us-gaap_FrequentFlierLiabilityCurrent |  | 1,100,000,000 us-gaap_FrequentFlierLiabilityCurrent |  |  |  | 1,300,000,000 us-gaap_FrequentFlierLiabilityCurrent |
Capitalized computer software, net | 403,000,000 us-gaap_CapitalizedComputerSoftwareNet |  | 357,000,000 us-gaap_CapitalizedComputerSoftwareNet |  |  |  | 403,000,000 us-gaap_CapitalizedComputerSoftwareNet |
Computer software depreciation expense | 122,000,000 us-gaap_CapitalizedComputerSoftwareAmortization |  | 90,000,000 us-gaap_CapitalizedComputerSoftwareAmortization |  | 59,000,000 us-gaap_CapitalizedComputerSoftwareAmortization |  |  |
Advertising costs | 207,000,000 us-gaap_AdvertisingExpense |  | 208,000,000 us-gaap_AdvertisingExpense |  | 223,000,000 us-gaap_AdvertisingExpense |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
The percentage of employees subject to amendable agreements in the current year (in hundredths) | 70.00%luv_PercentageOfEmployeesSubjectToAmendableAgreementsInCurrentYear |  |  |  |  |  | 70.00%luv_PercentageOfEmployeesSubjectToAmendableAgreementsInCurrentYear |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Gross carrying amount (in millions) (a) | 461,000,000 luv_IntangibleAssetsGross |  | 252,000,000 luv_IntangibleAssetsGross |  |  |  | 461,000,000 luv_IntangibleAssetsGross |
Weighted-average useful life (in years) | 15 years |  |  |  |  |  |  |
Accumulated amortization (in millions) (a) | 98,000,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |  | 86,000,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |  |  |  | 98,000,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |
Amortization of intangible assets | 13,000,000 us-gaap_AmortizationOfIntangibleAssets |  | 19,000,000 us-gaap_AmortizationOfIntangibleAssets |  | 25,000,000 us-gaap_AmortizationOfIntangibleAssets |  |  |
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract] |  |  |  |  |  |  |  |
2015 | 11,000,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths |  |  |  |  |  | 11,000,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths |
2016 | 8,000,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo |  |  |  |  |  | 8,000,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo |
2017 | 5,000,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree |  |  |  |  |  | 5,000,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree |
2018 | 5,000,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour |  |  |  |  |  | 5,000,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour |
2019 | 4,000,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive |  |  |  |  |  | 4,000,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive |
Thereafter | 27,000,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive |  |  |  |  |  | 27,000,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive |
Customer relationships/marketing agreements |  |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Gross carrying amount of finite-lived intangible assets | 38,000,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  | 39,000,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |  |  | 38,000,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |
Weighted-average useful life (in years) | 9 years |  |  |  |  |  |  |
Accumulated amortization (in millions) (a) | 26,000,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  | 23,000,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |  |  | 26,000,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |
Trademarks/trade names |  |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Gross carrying amount of finite-lived intangible assets | 36,000,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember |  | 36,000,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember |  |  |  | 36,000,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember |
Weighted-average useful life (in years) | 6 years |  |  |  |  |  |  |
Accumulated amortization (in millions) (a) | 30,000,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember |  | 25,000,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember |  |  |  | 30,000,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember |
Owned domestic slots |  |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Gross carrying amount of indefinite-lived intangible assets | 303,000,000 us-gaap_IndefiniteLivedDomesticSlotsAndRoutes / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UseRightsMember |  | 93,000,000 us-gaap_IndefiniteLivedDomesticSlotsAndRoutes / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UseRightsMember |  |  |  | 303,000,000 us-gaap_IndefiniteLivedDomesticSlotsAndRoutes / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UseRightsMember |
Contract-Based Intangible Assets [Member] |  |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Gross carrying amount of finite-lived intangible assets | 19,000,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ContractBasedIntangibleAssetsMember | [1] | 19,000,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ContractBasedIntangibleAssetsMember | [1] |  |  | 19,000,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ContractBasedIntangibleAssetsMember | [1]
Weighted-average useful life (in years) | 39 years | [1] |  |  |  |  |  |
Accumulated amortization (in millions) (a) | 5,000,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ContractBasedIntangibleAssetsMember | [1] | 4,000,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ContractBasedIntangibleAssetsMember | [1] |  |  | 5,000,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ContractBasedIntangibleAssetsMember | [1]
Non-compete agreements |  |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Gross carrying amount of finite-lived intangible assets | 5,000,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember |  | 5,000,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember |  |  |  | 5,000,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember |
Weighted-average useful life (in years) | 2 years |  |  |  |  |  |  |
Accumulated amortization (in millions) (a) | 5,000,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember |  | 5,000,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember |  |  |  | 5,000,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember |
Gate leasehold rights |  |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Gross carrying amount of finite-lived intangible assets | 60,000,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeaseAgreementsMember |  | 60,000,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeaseAgreementsMember |  |  |  | 60,000,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeaseAgreementsMember |
Weighted-average useful life (in years) | 19 years |  |  |  |  |  |  |
Accumulated amortization (in millions) (a) | 32,000,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeaseAgreementsMember |  | 29,000,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeaseAgreementsMember |  |  |  | 32,000,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeaseAgreementsMember |
Flight equipment |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Minimum percentage of cost estimated residual value (in hundredths) | 2.00%luv_PropertyPlantAndEquipmentPercentageCostToResidualValueMinimum / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FlightEquipmentMember |  |  |  |  |  |  |
Maximum percentage of cost estimated as residual value (in hundredths) | 20.00%luv_PropertyPlantAndEquipmentPercentageCostToResidualValueMaximum / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FlightEquipmentMember |  |  |  |  |  |  |
Flight equipment | Minimum |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Property, Plant, and Equipment Useful Life | 23 years |  |  |  |  |  |  |
Flight equipment | Maximum |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Property, Plant, and Equipment Useful Life | 25 years |  |  |  |  |  |  |
Property, Plant and Equipment [Member] | Minimum |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Property, Plant, and Equipment Useful Life | 5 years |  |  |  |  |  |  |
Property, Plant and Equipment [Member] | Maximum |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Property, Plant, and Equipment Useful Life | 30 years |  |  |  |  |  |  |
Ground property and equipment |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Minimum percentage of cost estimated residual value (in hundredths) | 0.00%luv_PropertyPlantAndEquipmentPercentageCostToResidualValueMinimum / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_OtherCapitalizedPropertyPlantAndEquipmentMember |  |  |  |  |  |  |
Maximum percentage of cost estimated as residual value (in hundredths) | 10.00%luv_PropertyPlantAndEquipmentPercentageCostToResidualValueMaximum / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_OtherCapitalizedPropertyPlantAndEquipmentMember |  |  |  |  |  |  |
Software | Minimum |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Property, Plant, and Equipment Useful Life | 5 years 0 months 0 days |  |  |  |  |  |  |
Software | Maximum |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Property, Plant, and Equipment Useful Life | 15 years 0 months 0 days |  |  |  |  |  |  |
Change In Estimated Useful Life |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |
Change In Accounting Estimate Financial Effect On Depreciation Expense |  |  |  |  | 12,000,000 luv_ChangeInAccountingEstimateFinancialEffectOnDepreciationExpense / us-gaap_ChangeInAccountingEstimateByTypeAxis = luv_ChangeInEstimatedUsefulLifeMember |  |  |
Change in accounting estimate, financial effect on net income |  |  |  |  | 6,000,000 luv_ChangeInAccountingEstimateFinancialEffectOnNetIncome / us-gaap_ChangeInAccountingEstimateByTypeAxis = luv_ChangeInEstimatedUsefulLifeMember |  |  |
Change in accounting estimate, financial effect on net income per share (in dollars per share) |  |  |  |  | $ (0.01)luv_ChangeInAccountingEstimateFinancialEffectOnNetIncomePerShare / us-gaap_ChangeInAccountingEstimateByTypeAxis = luv_ChangeInEstimatedUsefulLifeMember |  |  |
Change In Estimated Residual Values |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |
Residual Values Percent Of Original Cost Subsequent To Change |  |  |  |  |  | 2.00%luv_ResidualValuesPercentOfOriginalCostSubsequentToChange / us-gaap_ChangeInAccountingEstimateByTypeAxis = luv_ChangeInEstimatedResidualValuesMember |  |
Change In Accounting Estimate Financial Effect On Depreciation Expense |  |  |  |  | 34,000,000 luv_ChangeInAccountingEstimateFinancialEffectOnDepreciationExpense / us-gaap_ChangeInAccountingEstimateByTypeAxis = luv_ChangeInEstimatedResidualValuesMember |  |  |
Change in accounting estimate, financial effect on net income |  |  |  |  | 18,000,000 luv_ChangeInAccountingEstimateFinancialEffectOnNetIncome / us-gaap_ChangeInAccountingEstimateByTypeAxis = luv_ChangeInEstimatedResidualValuesMember |  |  |
Change in accounting estimate, financial effect on net income per share (in dollars per share) |  |  |  |  | $ 0.02 luv_ChangeInAccountingEstimateFinancialEffectOnNetIncomePerShare / us-gaap_ChangeInAccountingEstimateByTypeAxis = luv_ChangeInEstimatedResidualValuesMember |  |  |
Residual Values Percent Of Original Cost Prior To Change |  |  |  |  |  | 10.00%luv_ResidualValuesPercentOfOriginalCostPriorToChange / us-gaap_ChangeInAccountingEstimateByTypeAxis = luv_ChangeInEstimatedResidualValuesMember |  |
Change in Spoilage Estimate [Domain] |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |
Change in Accounting Estimate Financial Effect on Passenger Revenue |  |  |  |  |  |  | 55,000,000 luv_ChangeinAccountingEstimateFinancialEffectonPassengerRevenueSpoilageEstimate / us-gaap_ChangeInAccountingEstimateByTypeAxis = luv_ChangeinSpoilageEstimateDomain |
Change in accounting estimate, financial effect on net income, spoilage adjustment | 29,000,000 luv_Changeinaccountingestimatefinancialeffectonnetincomespoilageadjustment / us-gaap_ChangeInAccountingEstimateByTypeAxis = luv_ChangeinSpoilageEstimateDomain |  |  |  |  |  |  |
Change in accounting estimate,financial effect on earnings per share | $ 0.04 luv_Changeinaccountingestimatefinancialeffectonearningspershare / us-gaap_ChangeInAccountingEstimateByTypeAxis = luv_ChangeinSpoilageEstimateDomain |  |  |  |  |  |  |
Fuel derivatives |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |
Total collateral already posted aggregate fair value | 266,000,000 luv_TotalCollateralAlreadyPostedAggregateFairValue / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |  | 0 luv_TotalCollateralAlreadyPostedAggregateFairValue / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |  |  |  | 266,000,000 luv_TotalCollateralAlreadyPostedAggregateFairValue / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |
Other Noncurrent Liabilities | Fuel derivatives |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Collateral Already Posted, Aggregate Fair Value | 198,000,000 us-gaap_CollateralAlreadyPostedAggregateFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |  | 0 us-gaap_CollateralAlreadyPostedAggregateFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |  |  |  | 198,000,000 us-gaap_CollateralAlreadyPostedAggregateFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |
Other Noncurrent Liabilities | Interest rate derivatives |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Collateral Already Posted, Aggregate Fair Value | $ 0 us-gaap_CollateralAlreadyPostedAggregateFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |  | $ 32,000,000 us-gaap_CollateralAlreadyPostedAggregateFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |  |  |  | $ 0 us-gaap_CollateralAlreadyPostedAggregateFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |
Unionized Employees concentration risk |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
The percentage of Company's employees that are unionized and covered by collective bargaining agreements (in hundredths) | 83.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_UnionizedEmployeesConcentrationRiskMember |  |  |  |  |  |  |
[1] | Useful life of leased slots is based on the stated lease term.

X
- Definition Represents the increase in depreciation expense, excluding the impact of profitsharing and income taxes, resulting from the change in the estimated residual values of the Company's remaining owned 737-300 and 737-500 aircraft. + References No definition available. + Details
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Namespace Prefix: | luv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the increase in earnings both basic and diluted per share, net of profit sharing and income taxes, due to the change in the spoilage estimate. + References No definition available. + Details
Name: | luv_Changeinaccountingestimatefinancialeffectonearningspershare
Namespace Prefix: | luv_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the decrease in net income, including the impact of profit sharing and income taxes, resulting from the change in the estimated residual values of the Company's remaining owned 737-300 and 737-500 aircraft. + References No definition available. + Details
Name: | luv_ChangeInAccountingEstimateFinancialEffectOnNetIncome
Namespace Prefix: | luv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the decrease in both basic and diluted net income per share resulting from the change in the estimated residual values of the Company's remaining owned 737-300 and 737-500 aircraft. + References No definition available. + Details
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Namespace Prefix: | luv_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the increase in net income, including the impact of profit sharing and income taxes, resulting from the change in the spoilage estimate. + References No definition available. + Details
Name: | luv_Changeinaccountingestimatefinancialeffectonnetincomespoilageadjustment
Namespace Prefix: | luv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the increase in passenger revenues resulting from the change in the spoilage estimate. + References No definition available. + Details
Name: | luv_ChangeinAccountingEstimateFinancialEffectonPassengerRevenueSpoilageEstimate
Namespace Prefix: | luv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the percentage of funds received per flight segment credit segment sold from the sale of flight segment credits that related to free travel. + References No definition available. + Details
Name: | luv_FundsRelatedToFreeTravelPercentageSW
Namespace Prefix: | luv_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount before amortization of assets lacking physical substance. + References No definition available. + Details
Name: | luv_IntangibleAssetsGross
Namespace Prefix: | luv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Reflects the percentage of unionized employees subject to amendable agreements during the current year. + References No definition available. + Details
Name: | luv_PercentageOfEmployeesSubjectToAmendableAgreementsInCurrentYear
Namespace Prefix: | luv_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The maximum percentage of cost used to determine the residual value of long lived, physical assets used in the normal conduct of business and not intended for resale. Examples include land and improvements, buildings, and production equipment. + References No definition available. + Details
Name: | luv_PropertyPlantAndEquipmentPercentageCostToResidualValueMaximum
Namespace Prefix: | luv_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The minimum percentage of cost used to determine the residual value of long lived, physical assets used in the normal conduct of business and not intended for resale. Examples include land and improvements, buildings, and production equipment. + References No definition available. + Details
Name: | luv_PropertyPlantAndEquipmentPercentageCostToResidualValueMinimum
Namespace Prefix: | luv_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percent of original cost, prior to the change in estimate, on which the residual values of the Company's remaining owned 737-300 and 737-500 aircraft are based. + References No definition available. + Details
Name: | luv_ResidualValuesPercentOfOriginalCostPriorToChange
Namespace Prefix: | luv_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percent of original cost, subsequent to the change in estimate, on which the residual values of the Company's remaining owned 737-300 and 737-500 aircraft are based. + References No definition available. + Details
Name: | luv_ResidualValuesPercentOfOriginalCostSubsequentToChange
Namespace Prefix: | luv_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Total cash, current and noncurrent, that is already posted, at the end of the reporting period, as collateral for derivative instruments. + References No definition available. + Details
Name: | luv_TotalCollateralAlreadyPostedAggregateFairValue
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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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