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Fair Value Measurements - Quantitative Information about Level 3 Fair Value (Details) | 12 Months Ended
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Dec. 31, 2014
Discounted Cash Flow | Illiquidity Premium | Auction rate securities |
Quantitative Information About Level 3 [Line Items] |
Fair Value Measurement Range, Minimum | 3.00%luv_FairValueMeasurementRangeMin / luv_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis = us-gaap_AuctionRateSecuritiesMember / luv_FairValueValuationTechniqueAxis = luv_DiscountedCashFlowMember / luv_UnobservableInputAxis = luv_IlliquidityPremiumMember
Fair Value Measurement Range, Maximum |
Discounted Cash Flow | Counterparty Credit Spread | Auction rate securities |
Quantitative Information About Level 3 [Line Items] |
Fair Value Measurement Range, Minimum | 1.00%luv_FairValueMeasurementRangeMin / luv_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis = us-gaap_AuctionRateSecuritiesMember / luv_FairValueValuationTechniqueAxis = luv_DiscountedCashFlowMember / luv_UnobservableInputAxis = luv_CounterpartyCreditSpreadMember
Fair Value Measurement Range, Maximum | 2.00%luv_FairValueMeasurementRangeMax / luv_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis = us-gaap_AuctionRateSecuritiesMember / luv_FairValueValuationTechniqueAxis = luv_DiscountedCashFlowMember / luv_UnobservableInputAxis = luv_CounterpartyCreditSpreadMember
Discounted Cash Flow | Time To Principal Recovery | Auction rate securities |
Quantitative Information About Level 3 [Line Items] |
Fair Value Measurement Range, Minimum, Term | 8 years
Fair Value Measurement Range, Maximum, Term |
2015 | Option Model | Implied Volatility | Fuel derivatives |
Quantitative Information About Level 3 [Line Items] |
Fair Value Measurement Range, Minimum | 23.00%luv_FairValueMeasurementRangeMin / luv_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis = us-gaap_CommodityContractMember / luv_FairValueValuationTechniqueAxis = luv_OptionModelMember / luv_PeriodAxis = luv_NextFiscalYearMember / luv_UnobservableInputAxis = luv_ImpliedVolatilityMember
Fair Value Measurement Range, Maximum | 47.00%luv_FairValueMeasurementRangeMax / luv_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis = us-gaap_CommodityContractMember / luv_FairValueValuationTechniqueAxis = luv_OptionModelMember / luv_PeriodAxis = luv_NextFiscalYearMember / luv_UnobservableInputAxis = luv_ImpliedVolatilityMember
2016 | Option Model | Implied Volatility | Fuel derivatives |
Quantitative Information About Level 3 [Line Items] |
Fair Value Measurement Range, Minimum | 24.00%luv_FairValueMeasurementRangeMin / luv_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis = us-gaap_CommodityContractMember / luv_FairValueValuationTechniqueAxis = luv_OptionModelMember / luv_PeriodAxis = luv_YearTwoMember / luv_UnobservableInputAxis = luv_ImpliedVolatilityMember
Fair Value Measurement Range, Maximum | 36.00%luv_FairValueMeasurementRangeMax / luv_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis = us-gaap_CommodityContractMember / luv_FairValueValuationTechniqueAxis = luv_OptionModelMember / luv_PeriodAxis = luv_YearTwoMember / luv_UnobservableInputAxis = luv_ImpliedVolatilityMember
2017 | Option Model | Implied Volatility | Fuel derivatives |
Quantitative Information About Level 3 [Line Items] |
Fair Value Measurement Range, Minimum | 19.00%luv_FairValueMeasurementRangeMin / luv_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis = us-gaap_CommodityContractMember / luv_FairValueValuationTechniqueAxis = luv_OptionModelMember / luv_PeriodAxis = luv_YearThreeMember / luv_UnobservableInputAxis = luv_ImpliedVolatilityMember
Fair Value Measurement Range, Maximum | 30.00%luv_FairValueMeasurementRangeMax / luv_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis = us-gaap_CommodityContractMember / luv_FairValueValuationTechniqueAxis = luv_OptionModelMember / luv_PeriodAxis = luv_YearThreeMember / luv_UnobservableInputAxis = luv_ImpliedVolatilityMember
2018 | Option Model | Implied Volatility | Fuel derivatives |
Quantitative Information About Level 3 [Line Items] |
Fair Value Measurement Range, Minimum | 25.00%luv_FairValueMeasurementRangeMin / luv_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis = us-gaap_CommodityContractMember / luv_FairValueValuationTechniqueAxis = luv_OptionModelMember / luv_PeriodAxis = luv_YearFourMember / luv_UnobservableInputAxis = luv_ImpliedVolatilityMember
Fair Value Measurement Range, Maximum | 27.00%luv_FairValueMeasurementRangeMax / luv_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis = us-gaap_CommodityContractMember / luv_FairValueValuationTechniqueAxis = luv_OptionModelMember / luv_PeriodAxis = luv_YearFourMember / luv_UnobservableInputAxis = luv_ImpliedVolatilityMember

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- Definition Minimum range used in level 3 fair value calculation + References No definition available. + Details
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