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Consolidated Balance Sheet (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 1,282us-gaap_CashAndCashEquivalentsAtCarryingValue $ 1,355us-gaap_CashAndCashEquivalentsAtCarryingValue
Short-term investments 1,706us-gaap_ShortTermInvestments 1,797us-gaap_ShortTermInvestments
Accounts and other receivables 365us-gaap_AccountsAndOtherReceivablesNetCurrent 419us-gaap_AccountsAndOtherReceivablesNetCurrent
Inventories of parts and supplies, at cost 342us-gaap_AirlineRelatedInventory 467us-gaap_AirlineRelatedInventory
Deferred income taxes 477us-gaap_DeferredTaxAssetsNetCurrent 168us-gaap_DeferredTaxAssetsNetCurrent
Prepaid expenses and other current assets 232us-gaap_PrepaidExpenseAndOtherAssetsCurrent 250us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 4,404us-gaap_AssetsCurrent 4,456us-gaap_AssetsCurrent
Property and equipment, at cost:    
Flight equipment 18,473us-gaap_FlightEquipmentGross 16,937us-gaap_FlightEquipmentGross
Ground property and equipment 2,853us-gaap_PropertyPlantAndEquipmentOther 2,666us-gaap_PropertyPlantAndEquipmentOther
Deposits on flight equipment purchase contracts 566us-gaap_DepositsOnFlightEquipment 764us-gaap_DepositsOnFlightEquipment
Assets constructed for others 621luv_AssetsConstructedForOthers 453luv_AssetsConstructedForOthers
Property and equipment, at cost 22,513us-gaap_PropertyPlantAndEquipmentGross 20,820us-gaap_PropertyPlantAndEquipmentGross
Less allowance for depreciation and amortization 8,221us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 7,431us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net 14,292us-gaap_PropertyPlantAndEquipmentNet 13,389us-gaap_PropertyPlantAndEquipmentNet
Goodwill 970us-gaap_Goodwill 970us-gaap_Goodwill
Other assets 534us-gaap_OtherAssetsNoncurrent 530us-gaap_OtherAssetsNoncurrent
Total assets 20,200us-gaap_Assets 19,345us-gaap_Assets
Current liabilities:    
Accounts payable 1,203us-gaap_AccountsPayableCurrent 1,247us-gaap_AccountsPayableCurrent
Accrued liabilities 1,565us-gaap_AccruedLiabilitiesCurrent 1,229us-gaap_AccruedLiabilitiesCurrent
Air traffic liability 2,897us-gaap_DeferredAirTrafficRevenue 2,571us-gaap_DeferredAirTrafficRevenue
Current maturities of long-term debt 258us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent 629us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
Total current liabilities 5,923us-gaap_LiabilitiesCurrent 5,676us-gaap_LiabilitiesCurrent
Long-term debt less current maturities 2,434us-gaap_LongTermDebtAndCapitalLeaseObligations 2,191us-gaap_LongTermDebtAndCapitalLeaseObligations
Deferred income taxes 3,259us-gaap_DeferredTaxLiabilitiesNoncurrent 2,934us-gaap_DeferredTaxLiabilitiesNoncurrent
Construction obligation 554luv_ConstructionObligationNoncurrent 437luv_ConstructionObligationNoncurrent
Other noncurrent liabilities 1,255us-gaap_OtherLiabilitiesNoncurrent 771us-gaap_OtherLiabilitiesNoncurrent
Stockholders' equity:    
Common stock, $1.00 par value: 2,000,000,000 shares authorized; 807,611,634 shares issued in 2014 and 2013 808us-gaap_CommonStockValue 808us-gaap_CommonStockValue
Capital in excess of par value 1,315us-gaap_AdditionalPaidInCapitalCommonStock 1,231us-gaap_AdditionalPaidInCapitalCommonStock
Retained earnings 7,416us-gaap_RetainedEarningsAccumulatedDeficit 6,431us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive loss (738)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (3)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Treasury stock, at cost: 132,017,550 and 107,136,946 shares in 2014 and 2013 respectively (2,026)us-gaap_TreasuryStockValue (1,131)us-gaap_TreasuryStockValue
Total stockholders' equity 6,775us-gaap_StockholdersEquity 7,336us-gaap_StockholdersEquity
Total liabilities and stockholders' equity $ 20,200us-gaap_LiabilitiesAndStockholdersEquity $ 19,345us-gaap_LiabilitiesAndStockholdersEquity