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Supplemental Financial Information - Accrued Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Supplemental Financial Data [Line Items]    
Profitsharing and savings plans $ 374us-gaap_DeferredCompensationCashBasedArrangementsLiabilityCurrent $ 244us-gaap_DeferredCompensationCashBasedArrangementsLiabilityCurrent
Aircraft and other lease related obligations 159us-gaap_AccruedRentCurrent 173us-gaap_AccruedRentCurrent
Vacation pay 292us-gaap_AccruedVacationCurrent 278us-gaap_AccruedVacationCurrent
Health 84us-gaap_AccruedEmployeeBenefitsCurrent 73us-gaap_AccruedEmployeeBenefitsCurrent
Workers compensation 165us-gaap_WorkersCompensationLiabilityCurrent 161us-gaap_WorkersCompensationLiabilityCurrent
Property and other taxes 81us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent 65us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent
Other 236us-gaap_OtherAccruedLiabilitiesCurrent 223us-gaap_OtherAccruedLiabilitiesCurrent
Accrued liabilities 1,565us-gaap_AccruedLiabilitiesCurrent 1,229us-gaap_AccruedLiabilitiesCurrent
Fuel derivatives | Accrued Liabilities    
Supplemental Financial Data [Line Items]    
Derivative Contracts $ 174luv_DerivativeLiabilityFairValueAmountOffsetAgainstCollateralTotal
/ us-gaap_BalanceSheetLocationAxis
= luv_AccruedLiabilitiesBalanceSheetLocationMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
[1] $ 12luv_DerivativeLiabilityFairValueAmountOffsetAgainstCollateralTotal
/ us-gaap_BalanceSheetLocationAxis
= luv_AccruedLiabilitiesBalanceSheetLocationMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
[1]
[1] The net amounts of derivative assets and liabilities are reconciled to the individual line item amounts presented in the Consolidated Balance Sheet in Note 5.