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Leases (Details) (B-717-200 Aircraft, USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2015
aircraft
Sep. 30, 2012
Dec. 31, 2014
Jul. 09, 2012
aircraft
Aircraft Type [Line Items]        
Lessee Delta Air Lines, Inc.      
Total assets available for lease/sublease, number of units       88luv_PropertySubjectToOrAvailableForLeaseNumberOfUnitsTotal
Number of aircraft delivered to sublessee 61luv_NumberOfAircraftDeliveredToSublessee      
Operating lease, number of units 76us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNumberOfUnits      
Owned assets, number of units 10luv_OwnedAssetsNumberOfUnits      
Capital leased assets, number of units 2us-gaap_CapitalLeasedAssetsNumberOfUnits      
Contingent payments $ 0us-gaap_CapitalLeasesContingentRentalPaymentsDue      
Residual value 0us-gaap_CapitalLeasesNetInvestmentInSalesTypeLeasesUnguaranteedResidualValuesOfLeasedProperty      
Estimated loss on sublease   137,000,000luv_EstimatedLossOnSublease    
Additional Estimated Loss on Sublease $ (4,000,000)luv_AdditionalEstimatedLossonSublease   $ (22,000,000)luv_AdditionalEstimatedLossonSublease  
Maximum        
Aircraft Type [Line Items]        
Sublease terms for leased aircraft 9 years      
Lease terms for owned aircraft 7 years      
Minimum        
Aircraft Type [Line Items]        
Sublease terms for leased aircraft 3 years