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Supplemental Financial Information - Other Non-Current Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Other Liabilities, Noncurrent [Abstract]    
Postretirement obligation $ 172us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent $ 169us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
Non-current lease-related obligations 183luv_NoncurrentLeaseRelatedObligations 193luv_NoncurrentLeaseRelatedObligations
Other deferred compensation 164us-gaap_OtherDeferredCompensationArrangementsLiabilityClassifiedNoncurrent 174us-gaap_OtherDeferredCompensationArrangementsLiabilityClassifiedNoncurrent
Deferred gains from sale and leaseback of aircraft 51us-gaap_SaleLeasebackTransactionDeferredGainNet 53us-gaap_SaleLeasebackTransactionDeferredGainNet
Other 37us-gaap_OtherSundryLiabilitiesNoncurrent 44us-gaap_OtherSundryLiabilitiesNoncurrent
Other noncurrent liabilities 1,095us-gaap_OtherLiabilitiesNoncurrent 1,255us-gaap_OtherLiabilitiesNoncurrent
Other Noncurrent Liabilities    
Other Liabilities, Noncurrent [Abstract]    
Liability derivative contracts, net 488luv_DerivativeLiabilityFairValueAmountOffsetAgainstCollateralTotal
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember		 622luv_DerivativeLiabilityFairValueAmountOffsetAgainstCollateralTotal
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember
Fuel derivatives | Other Noncurrent Liabilities    
Other Liabilities, Noncurrent [Abstract]    
Liability derivative contracts, net 427luv_DerivativeLiabilityFairValueAmountOffsetAgainstCollateralTotal
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember		 [1] 561luv_DerivativeLiabilityFairValueAmountOffsetAgainstCollateralTotal
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember		 [1]
Interest rate derivatives | Other Noncurrent Liabilities    
Other Liabilities, Noncurrent [Abstract]    
Liability derivative contracts, net $ 61luv_DerivativeLiabilityFairValueAmountOffsetAgainstCollateralTotal
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		 [1] $ 61luv_DerivativeLiabilityFairValueAmountOffsetAgainstCollateralTotal
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		 [1]
[1] The net amounts of derivative assets and liabilities are reconciled to the individual line item amounts presented in the unaudited Condensed Consolidated Balance Sheet in Note 5.