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Condensed Consolidated Balance Sheet (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 2,025us-gaap_CashAndCashEquivalentsAtCarryingValue $ 1,282us-gaap_CashAndCashEquivalentsAtCarryingValue
Short-term investments 1,413us-gaap_ShortTermInvestments 1,706us-gaap_ShortTermInvestments
Accounts and other receivables 499us-gaap_AccountsAndOtherReceivablesNetCurrent 365us-gaap_AccountsAndOtherReceivablesNetCurrent
Inventories of parts and supplies, at cost 304us-gaap_AirlineRelatedInventory 342us-gaap_AirlineRelatedInventory
Deferred income taxes 452us-gaap_DeferredTaxAssetsNetCurrent 477us-gaap_DeferredTaxAssetsNetCurrent
Prepaid expenses and other current assets 270us-gaap_PrepaidExpenseAndOtherAssetsCurrent 232us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 4,963us-gaap_AssetsCurrent 4,404us-gaap_AssetsCurrent
Property and equipment, at cost:    
Flight equipment 18,858us-gaap_FlightEquipmentGross 18,473us-gaap_FlightEquipmentGross
Ground property and equipment 2,899us-gaap_PropertyPlantAndEquipmentOther 2,853us-gaap_PropertyPlantAndEquipmentOther
Deposits on flight equipment purchase contracts 619us-gaap_DepositsOnFlightEquipment 566us-gaap_DepositsOnFlightEquipment
Assets constructed for others 686luv_AssetsConstructedForOthers 621luv_AssetsConstructedForOthers
Property and equipment, at cost 23,062us-gaap_PropertyPlantAndEquipmentGross 22,513us-gaap_PropertyPlantAndEquipmentGross
Less allowance for depreciation and amortization 8,455us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 8,221us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net 14,607us-gaap_PropertyPlantAndEquipmentNet 14,292us-gaap_PropertyPlantAndEquipmentNet
Goodwill 970us-gaap_Goodwill 970us-gaap_Goodwill
Other assets 623us-gaap_OtherAssetsNoncurrent 534us-gaap_OtherAssetsNoncurrent
Total assets 21,163us-gaap_Assets 20,200us-gaap_Assets
Current liabilities:    
Accounts payable 1,145us-gaap_AccountsPayableCurrent 1,203us-gaap_AccountsPayableCurrent
Accrued liabilities 1,874us-gaap_AccruedLiabilitiesCurrent 1,565us-gaap_AccruedLiabilitiesCurrent
Air traffic liability 3,613us-gaap_DeferredAirTrafficRevenue 2,897us-gaap_DeferredAirTrafficRevenue
Current maturities of long-term debt 271us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent 258us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
Total current liabilities 6,903us-gaap_LiabilitiesCurrent 5,923us-gaap_LiabilitiesCurrent
Long-term debt less current maturities 2,416us-gaap_LongTermDebtAndCapitalLeaseObligations 2,434us-gaap_LongTermDebtAndCapitalLeaseObligations
Deferred income taxes 3,252us-gaap_DeferredTaxLiabilitiesNoncurrent 3,259us-gaap_DeferredTaxLiabilitiesNoncurrent
Construction obligation 595luv_ConstructionObligationNoncurrent 554luv_ConstructionObligationNoncurrent
Other noncurrent liabilities 1,095us-gaap_OtherLiabilitiesNoncurrent 1,255us-gaap_OtherLiabilitiesNoncurrent
Stockholders' equity:    
Common stock 808us-gaap_CommonStockValue 808us-gaap_CommonStockValue
Capital in excess of par value 1,329us-gaap_AdditionalPaidInCapitalCommonStock 1,315us-gaap_AdditionalPaidInCapitalCommonStock
Retained earnings 7,829us-gaap_RetainedEarningsAccumulatedDeficit 7,416us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive loss (742)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (738)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Treasury stock, at cost (2,322)us-gaap_TreasuryStockValue (2,026)us-gaap_TreasuryStockValue
Total stockholders' equity 6,902us-gaap_StockholdersEquity 6,775us-gaap_StockholdersEquity
Total liabilities and stockholders' equity $ 21,163us-gaap_LiabilitiesAndStockholdersEquity $ 20,200us-gaap_LiabilitiesAndStockholdersEquity