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Supplemental Financial Information - Other Non-Current Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Other Liabilities, Noncurrent [Abstract]    
Postretirement obligation $ 169us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent $ 138us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
Non-current lease-related obligations 193luv_NoncurrentLeaseRelatedObligations 290luv_NoncurrentLeaseRelatedObligations
Other deferred compensation 174us-gaap_OtherDeferredCompensationArrangementsLiabilityClassifiedNoncurrent 163us-gaap_OtherDeferredCompensationArrangementsLiabilityClassifiedNoncurrent
Deferred gains from sale and leaseback of aircraft 53us-gaap_SaleLeasebackTransactionDeferredGainNet 65us-gaap_SaleLeasebackTransactionDeferredGainNet
Other 44us-gaap_OtherSundryLiabilitiesNoncurrent 70us-gaap_OtherSundryLiabilitiesNoncurrent
Other non-current liabilities 1,255us-gaap_OtherLiabilitiesNoncurrent 771us-gaap_OtherLiabilitiesNoncurrent
Other Noncurrent Liabilities    
Other Liabilities, Noncurrent [Abstract]    
Derivative contracts 622luv_DerivativeLiabilityFairValueAmountOffsetAgainstCollateralTotal
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember		  
Other Noncurrent Liabilities | Interest Rate Swap    
Other Liabilities, Noncurrent [Abstract]    
Derivative contracts $ 61luv_DerivativeLiabilityFairValueAmountOffsetAgainstCollateralTotal
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		 [1] $ 45luv_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 Consolidated Balance Sheet in Note 5.