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Fair Value Measurements - Quantative Information about Level 3 Fair Value (Details)
 3 Months Ended
Mar. 31, 2015
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
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 Min, Term 8 years
Second Quarter of 2015 | 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_SecondQuarterof2015Member
/ 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_SecondQuarterof2015Member
/ luv_UnobservableInputAxis
= luv_ImpliedVolatilityMember
Third Quarter of 2015 | Option Model | Implied Volatility | Fuel derivatives  
Quantitative Information About Level 3 [Line Items]  
Fair Value Measurement Range, Minimum 31.00%luv_FairValueMeasurementRangeMin
/ luv_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis
= us-gaap_CommodityContractMember
/ luv_FairValueValuationTechniqueAxis
= luv_OptionModelMember
/ luv_PeriodAxis
= luv_ThirdQuarterof2015Member
/ luv_UnobservableInputAxis
= luv_ImpliedVolatilityMember
Fair Value Measurement Range, Maximum 43.00%luv_FairValueMeasurementRangeMax
/ luv_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis
= us-gaap_CommodityContractMember
/ luv_FairValueValuationTechniqueAxis
= luv_OptionModelMember
/ luv_PeriodAxis
= luv_ThirdQuarterof2015Member
/ luv_UnobservableInputAxis
= luv_ImpliedVolatilityMember
Fourth Quarter of 2015 | Option Model | Implied Volatility | Fuel derivatives  
Quantitative Information About Level 3 [Line Items]  
Fair Value Measurement Range, Minimum 28.00%luv_FairValueMeasurementRangeMin
/ luv_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis
= us-gaap_CommodityContractMember
/ luv_FairValueValuationTechniqueAxis
= luv_OptionModelMember
/ luv_PeriodAxis
= luv_FourthQuarterof2015Member
/ luv_UnobservableInputAxis
= luv_ImpliedVolatilityMember
Fair Value Measurement Range, Maximum 40.00%luv_FairValueMeasurementRangeMax
/ luv_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis
= us-gaap_CommodityContractMember
/ luv_FairValueValuationTechniqueAxis
= luv_OptionModelMember
/ luv_PeriodAxis
= luv_FourthQuarterof2015Member
/ luv_UnobservableInputAxis
= luv_ImpliedVolatilityMember
2016 | Option Model | Implied Volatility | Fuel derivatives  
Quantitative Information About Level 3 [Line Items]  
Fair Value Measurement Range, Minimum 22.00%luv_FairValueMeasurementRangeMin
/ luv_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis
= us-gaap_CommodityContractMember
/ luv_FairValueValuationTechniqueAxis
= luv_OptionModelMember
/ luv_PeriodAxis
= luv_NextFiscalYearMember
/ luv_UnobservableInputAxis
= luv_ImpliedVolatilityMember
Fair Value Measurement Range, Maximum 35.00%luv_FairValueMeasurementRangeMax
/ luv_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis
= us-gaap_CommodityContractMember
/ luv_FairValueValuationTechniqueAxis
= luv_OptionModelMember
/ luv_PeriodAxis
= luv_NextFiscalYearMember
/ 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_YearTwoMember
/ luv_UnobservableInputAxis
= luv_ImpliedVolatilityMember
Fair Value Measurement Range, Maximum 25.00%luv_FairValueMeasurementRangeMax
/ luv_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis
= us-gaap_CommodityContractMember
/ luv_FairValueValuationTechniqueAxis
= luv_OptionModelMember
/ luv_PeriodAxis
= luv_YearTwoMember
/ luv_UnobservableInputAxis
= luv_ImpliedVolatilityMember
2018 | Option Model | Implied Volatility | Fuel derivatives  
Quantitative Information About Level 3 [Line Items]  
Fair Value Measurement Range, Minimum 20.00%luv_FairValueMeasurementRangeMin
/ luv_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis
= us-gaap_CommodityContractMember
/ luv_FairValueValuationTechniqueAxis
= luv_OptionModelMember
/ luv_PeriodAxis
= luv_YearThreeMember
/ luv_UnobservableInputAxis
= luv_ImpliedVolatilityMember
Fair Value Measurement Range, Maximum 24.00%luv_FairValueMeasurementRangeMax
/ luv_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis
= us-gaap_CommodityContractMember
/ luv_FairValueValuationTechniqueAxis
= luv_OptionModelMember
/ luv_PeriodAxis
= luv_YearThreeMember
/ luv_UnobservableInputAxis
= luv_ImpliedVolatilityMember