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Financial Derivative Instruments - Fair Values of Fuel Derivatives Amounts Posted as Collateral (Details) (Fuel derivatives, USD $) In Millions, unless otherwise specified | Mar. 31, 2015
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Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | $ (1,066)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral |
Cash collateral held by CP | (283)us-gaap_CollateralAlreadyPostedAggregateFairValue |
Aircraft collateral pledged to CP | (302)luv_AircraftCollateralPledgedAggregateFairValue |
Letters of credit (LC) | (75)luv_LettersofCreditCollateralPledgedAggregateFairValue |
Counterparty A |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | (424)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / luv_CounterpartyAxis = luv_CounterpartyAlphaMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |
Cash collateral held by CP | (150)us-gaap_CollateralAlreadyPostedAggregateFairValue / luv_CounterpartyAxis = luv_CounterpartyAlphaMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |
Aircraft collateral pledged to CP | (188)luv_AircraftCollateralPledgedAggregateFairValue / luv_CounterpartyAxis = luv_CounterpartyAlphaMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |
Letters of credit (LC) | 0 luv_LettersofCreditCollateralPledgedAggregateFairValue / luv_CounterpartyAxis = luv_CounterpartyAlphaMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |
Counterparty B |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | (142)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / luv_CounterpartyAxis = luv_CounterpartyBMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |
Cash collateral held by CP | (50)us-gaap_CollateralAlreadyPostedAggregateFairValue / luv_CounterpartyAxis = luv_CounterpartyBMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |
Aircraft collateral pledged to CP | (43)luv_AircraftCollateralPledgedAggregateFairValue / luv_CounterpartyAxis = luv_CounterpartyBMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |
Letters of credit (LC) | 0 luv_LettersofCreditCollateralPledgedAggregateFairValue / luv_CounterpartyAxis = luv_CounterpartyBMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |
Counterparty C |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | (127)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / luv_CounterpartyAxis = luv_CounterpartyCMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |
Cash collateral held by CP | (57)us-gaap_CollateralAlreadyPostedAggregateFairValue / luv_CounterpartyAxis = luv_CounterpartyCMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |
Aircraft collateral pledged to CP | 0 luv_AircraftCollateralPledgedAggregateFairValue / luv_CounterpartyAxis = luv_CounterpartyCMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |
Letters of credit (LC) | 0 luv_LettersofCreditCollateralPledgedAggregateFairValue / luv_CounterpartyAxis = luv_CounterpartyCMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |
Counterparty D |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | (211)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / luv_CounterpartyAxis = luv_CounterpartyDMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |
Cash collateral held by CP | 0 us-gaap_CollateralAlreadyPostedAggregateFairValue / luv_CounterpartyAxis = luv_CounterpartyDMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |
Aircraft collateral pledged to CP | (71)luv_AircraftCollateralPledgedAggregateFairValue / luv_CounterpartyAxis = luv_CounterpartyDMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |
Letters of credit (LC) | (75)luv_LettersofCreditCollateralPledgedAggregateFairValue / luv_CounterpartyAxis = luv_CounterpartyDMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |
Counterparty E |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | (65)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / luv_CounterpartyAxis = luv_CounterpartyEMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |
Cash collateral held by CP | (1)us-gaap_CollateralAlreadyPostedAggregateFairValue / luv_CounterpartyAxis = luv_CounterpartyEMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |
Aircraft collateral pledged to CP | 0 luv_AircraftCollateralPledgedAggregateFairValue / luv_CounterpartyAxis = luv_CounterpartyEMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |
Letters of credit (LC) | 0 luv_LettersofCreditCollateralPledgedAggregateFairValue / luv_CounterpartyAxis = luv_CounterpartyEMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |
Counterparty F |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | (68)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / luv_CounterpartyAxis = luv_CounterpartyFMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |
Cash collateral held by CP | (25)us-gaap_CollateralAlreadyPostedAggregateFairValue / luv_CounterpartyAxis = luv_CounterpartyFMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |
Aircraft collateral pledged to CP | 0 luv_AircraftCollateralPledgedAggregateFairValue / luv_CounterpartyAxis = luv_CounterpartyFMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |
Letters of credit (LC) | 0 luv_LettersofCreditCollateralPledgedAggregateFairValue / luv_CounterpartyAxis = luv_CounterpartyFMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |
Counterparty Other |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | (29)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / luv_CounterpartyAxis = luv_CounterpartyOtherMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | [1]
Cash collateral held by CP | 0 us-gaap_CollateralAlreadyPostedAggregateFairValue / luv_CounterpartyAxis = luv_CounterpartyOtherMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | [1]
Aircraft collateral pledged to CP | 0 luv_AircraftCollateralPledgedAggregateFairValue / luv_CounterpartyAxis = luv_CounterpartyOtherMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | [1]
Letters of credit (LC) | 0 luv_LettersofCreditCollateralPledgedAggregateFairValue / luv_CounterpartyAxis = luv_CounterpartyOtherMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | [1]
Minimum | Counterparty A |  |
If credit rating is investment grade, fair value of fuel derivative level at which: |  |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 | (50)luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelsInWhichCashIsProvidedThreshold1 / luv_CounterpartyAxis = luv_CounterpartyAlphaMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 2 | (600)luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelsInWhichCashIsProvidedThreshold2 / luv_CounterpartyAxis = luv_CounterpartyAlphaMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Fair value of fuel derivative level at which cash is received from CP | 50 luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelInWhichCashIsReceived / luv_CounterpartyAxis = luv_CounterpartyAlphaMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP | (200)luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelsInWhichAircraftOrCashCollateralIsPledged / luv_CounterpartyAxis = luv_CounterpartyAlphaMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MinimumMember | [2]
If credit rating is non-investment grade, fair value of fuel derivative level at which: |  |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 | 0 luv_NonInvestmentGradeRatingFairValueOfFuelDerivativeLevelInWhichCashIsProvidedThreshold1 / luv_CounterpartyAxis = luv_CounterpartyAlphaMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 2 | (600)luv_NonInvestmentGradeRatingFairValueOfFuelDerivativeLevelInWhichCashIsProvidedThreshold2 / luv_CounterpartyAxis = luv_CounterpartyAlphaMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Fair value of fuel derivative level at which cash is received from CP |  | [3]
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP | (200)luv_NonInvestmentGradeRatingFairValueOfFuelDerivativeLevelsatWhichAircraftOrCashcollateralIsPledged / luv_CounterpartyAxis = luv_CounterpartyAlphaMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Minimum | Counterparty B |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |
Option to substitute LC for aircraft | (100)luv_FairValueOfFuelDerivativeLevelsInWhichLettersOfCreditMayBeSubstitutedForAircraft / luv_CounterpartyAxis = luv_CounterpartyBMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MinimumMember | [4]
Option to substitute LC for cash Threshold 1 | (500)luv_FairValueOfFuelDerivativeLevelsInWhichLettersOfCreditMayBeSubstitutedForCashThreshold1 / luv_CounterpartyAxis = luv_CounterpartyBMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
If credit rating is investment grade, fair value of fuel derivative level at which: |  |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 | (50)luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelsInWhichCashIsProvidedThreshold1 / luv_CounterpartyAxis = luv_CounterpartyBMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 2 | (500)luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelsInWhichCashIsProvidedThreshold2 / luv_CounterpartyAxis = luv_CounterpartyBMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Fair value of fuel derivative level at which cash is received from CP | 150 luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelInWhichCashIsReceived / luv_CounterpartyAxis = luv_CounterpartyBMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP | (100)luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelsInWhichAircraftOrCashCollateralIsPledged / luv_CounterpartyAxis = luv_CounterpartyBMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
If credit rating is non-investment grade, fair value of fuel derivative level at which: |  |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 | 0 luv_NonInvestmentGradeRatingFairValueOfFuelDerivativeLevelInWhichCashIsProvidedThreshold1 / luv_CounterpartyAxis = luv_CounterpartyBMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 2 | (500)luv_NonInvestmentGradeRatingFairValueOfFuelDerivativeLevelInWhichCashIsProvidedThreshold2 / luv_CounterpartyAxis = luv_CounterpartyBMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Fair value of fuel derivative level at which cash is received from CP |  | [3]
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP | (100)luv_NonInvestmentGradeRatingFairValueOfFuelDerivativeLevelsatWhichAircraftOrCashcollateralIsPledged / luv_CounterpartyAxis = luv_CounterpartyBMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Minimum | Counterparty C |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |
Option to substitute LC for cash Threshold 1 | (100)luv_FairValueOfFuelDerivativeLevelsInWhichLettersOfCreditMayBeSubstitutedForCashThreshold1 / luv_CounterpartyAxis = luv_CounterpartyCMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MinimumMember | [5]
If credit rating is investment grade, fair value of fuel derivative level at which: |  |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 | (75)luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelsInWhichCashIsProvidedThreshold1 / luv_CounterpartyAxis = luv_CounterpartyCMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Fair value of fuel derivative level at which cash is received from CP | 175 luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelInWhichCashIsReceived / luv_CounterpartyAxis = luv_CounterpartyCMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MinimumMember | [6]
If credit rating is non-investment grade, fair value of fuel derivative level at which: |  |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 |  | [3]
Fair value of fuel derivative level at which cash is received from CP |  | [3]
Minimum | Counterparty D |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |
Option to substitute LC for aircraft | (150)luv_FairValueOfFuelDerivativeLevelsInWhichLettersOfCreditMayBeSubstitutedForAircraft / luv_CounterpartyAxis = luv_CounterpartyDMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MinimumMember | [4]
Option to substitute LC for cash Threshold 1 | (75)luv_FairValueOfFuelDerivativeLevelsInWhichLettersOfCreditMayBeSubstitutedForCashThreshold1 / luv_CounterpartyAxis = luv_CounterpartyDMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MinimumMember | [4]
Option to substitute LC for cash Threshold 2 | (550)luv_FairValueOfFuelDerivativeLevelsInWhichLettersOfCreditMayBeSubstitutedForCashThreshold2 / luv_CounterpartyAxis = luv_CounterpartyDMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MinimumMember | [4]
If credit rating is investment grade, fair value of fuel derivative level at which: |  |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 | (75)luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelsInWhichCashIsProvidedThreshold1 / luv_CounterpartyAxis = luv_CounterpartyDMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 2 | (550)luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelsInWhichCashIsProvidedThreshold2 / luv_CounterpartyAxis = luv_CounterpartyDMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Fair value of fuel derivative level at which cash is received from CP | 200 luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelInWhichCashIsReceived / luv_CounterpartyAxis = luv_CounterpartyDMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP | (150)luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelsInWhichAircraftOrCashCollateralIsPledged / luv_CounterpartyAxis = luv_CounterpartyDMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MinimumMember | [4]
If credit rating is non-investment grade, fair value of fuel derivative level at which: |  |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 | 0 luv_NonInvestmentGradeRatingFairValueOfFuelDerivativeLevelInWhichCashIsProvidedThreshold1 / luv_CounterpartyAxis = luv_CounterpartyDMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 2 | (550)luv_NonInvestmentGradeRatingFairValueOfFuelDerivativeLevelInWhichCashIsProvidedThreshold2 / luv_CounterpartyAxis = luv_CounterpartyDMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Fair value of fuel derivative level at which cash is received from CP |  | [3]
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP | (150)luv_NonInvestmentGradeRatingFairValueOfFuelDerivativeLevelsatWhichAircraftOrCashcollateralIsPledged / luv_CounterpartyAxis = luv_CounterpartyDMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Minimum | Counterparty E |  |
If credit rating is investment grade, fair value of fuel derivative level at which: |  |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 | (65)luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelsInWhichCashIsProvidedThreshold1 / luv_CounterpartyAxis = luv_CounterpartyEMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Fair value of fuel derivative level at which cash is received from CP | 30 luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelInWhichCashIsReceived / luv_CounterpartyAxis = luv_CounterpartyEMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
If credit rating is non-investment grade, fair value of fuel derivative level at which: |  |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 |  | [3]
Fair value of fuel derivative level at which cash is received from CP |  | [3]
Minimum | Counterparty F |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |
Option to substitute LC for cash Threshold 1 |  | [7]
If credit rating is investment grade, fair value of fuel derivative level at which: |  |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 | (50)luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelsInWhichCashIsProvidedThreshold1 / luv_CounterpartyAxis = luv_CounterpartyFMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Fair value of fuel derivative level at which cash is received from CP | 50 luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelInWhichCashIsReceived / luv_CounterpartyAxis = luv_CounterpartyFMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
If credit rating is non-investment grade, fair value of fuel derivative level at which: |  |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 |  | [3]
Fair value of fuel derivative level at which cash is received from CP |  | [3]
Maximum | Counterparty A |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |
Option to substitute LC for aircraft | (400)luv_FairValueOfFuelDerivativeLevelsInWhichLettersOfCreditMayBeSubstitutedForAircraft / luv_CounterpartyAxis = luv_CounterpartyAlphaMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MaximumMember | [8]
If credit rating is investment grade, fair value of fuel derivative level at which: |  |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 | (200)luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelsInWhichCashIsProvidedThreshold1 / luv_CounterpartyAxis = luv_CounterpartyAlphaMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP | (600)luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelsInWhichAircraftOrCashCollateralIsPledged / luv_CounterpartyAxis = luv_CounterpartyAlphaMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MaximumMember | [2]
If credit rating is non-investment grade, fair value of fuel derivative level at which: |  |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 | (200)luv_NonInvestmentGradeRatingFairValueOfFuelDerivativeLevelInWhichCashIsProvidedThreshold1 / luv_CounterpartyAxis = luv_CounterpartyAlphaMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP | (600)luv_NonInvestmentGradeRatingFairValueOfFuelDerivativeLevelsatWhichAircraftOrCashcollateralIsPledged / luv_CounterpartyAxis = luv_CounterpartyAlphaMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
Maximum | Counterparty B |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |
Option to substitute LC for aircraft | (500)luv_FairValueOfFuelDerivativeLevelsInWhichLettersOfCreditMayBeSubstitutedForAircraft / luv_CounterpartyAxis = luv_CounterpartyBMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MaximumMember | [4]
If credit rating is investment grade, fair value of fuel derivative level at which: |  |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 | (100)luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelsInWhichCashIsProvidedThreshold1 / luv_CounterpartyAxis = luv_CounterpartyBMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP | (500)luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelsInWhichAircraftOrCashCollateralIsPledged / luv_CounterpartyAxis = luv_CounterpartyBMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MaximumMember | [4]
If credit rating is non-investment grade, fair value of fuel derivative level at which: |  |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 | (100)luv_NonInvestmentGradeRatingFairValueOfFuelDerivativeLevelInWhichCashIsProvidedThreshold1 / luv_CounterpartyAxis = luv_CounterpartyBMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP | (500)luv_NonInvestmentGradeRatingFairValueOfFuelDerivativeLevelsatWhichAircraftOrCashcollateralIsPledged / luv_CounterpartyAxis = luv_CounterpartyBMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
Maximum | Counterparty C |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |
Option to substitute LC for cash Threshold 1 | (150)luv_FairValueOfFuelDerivativeLevelsInWhichLettersOfCreditMayBeSubstitutedForCashThreshold1 / luv_CounterpartyAxis = luv_CounterpartyCMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MaximumMember | [5]
Maximum | Counterparty D |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |
Option to substitute LC for aircraft | (550)luv_FairValueOfFuelDerivativeLevelsInWhichLettersOfCreditMayBeSubstitutedForAircraft / luv_CounterpartyAxis = luv_CounterpartyDMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MaximumMember | [4]
Option to substitute LC for cash Threshold 1 | (150)luv_FairValueOfFuelDerivativeLevelsInWhichLettersOfCreditMayBeSubstitutedForCashThreshold1 / luv_CounterpartyAxis = luv_CounterpartyDMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MaximumMember | [4]
If credit rating is investment grade, fair value of fuel derivative level at which: |  |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 | (150)luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelsInWhichCashIsProvidedThreshold1 / luv_CounterpartyAxis = luv_CounterpartyDMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP | (550)luv_InvestmentGradeRatingFairValueOfFuelDerivativeLevelsInWhichAircraftOrCashCollateralIsPledged / luv_CounterpartyAxis = luv_CounterpartyDMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MaximumMember | [4]
If credit rating is non-investment grade, fair value of fuel derivative level at which: |  |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 | (150)luv_NonInvestmentGradeRatingFairValueOfFuelDerivativeLevelInWhichCashIsProvidedThreshold1 / luv_CounterpartyAxis = luv_CounterpartyDMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP | $ (550)luv_NonInvestmentGradeRatingFairValueOfFuelDerivativeLevelsatWhichAircraftOrCashcollateralIsPledged / luv_CounterpartyAxis = luv_CounterpartyDMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
[1] | Individual counterparties with fair value of fuel derivatives <$20 million.
[2] | The Company has the option of providing cash or pledging aircraft as collateral.
[3] | Cash collateral is provided at 100 percent of fair value of fuel derivative contracts.
[4] | The Company has the option of providing cash, letters of credit, or pledging aircraft as collateral.
[5] | The Company has the option of providing cash or letters of credit as collateral.
[6] | Thresholds may vary based on changes in credit ratings within investment grade.
[7] | The Company has the option to substitute letters of credit for 100 percent of cash collateral requirement.
[8] | The Company has the option of providing letters of credit in addition to aircraft collateral if the appraised value of the aircraft does not meet the collateral requirements.

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