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Consolidated Statements Of Cash Flows (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD $ 8,658us-gaap_CashAndCashEquivalentsAtCarryingValue $ 8,084us-gaap_CashAndCashEquivalentsAtCarryingValue $ 5,269us-gaap_CashAndCashEquivalentsAtCarryingValue
OPERATING ACTIVITIES:      
Net income (loss) (241)us-gaap_NetIncomeLoss 274us-gaap_NetIncomeLoss (39)us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash from operating activities:      
Depreciation of property and equipment, including internal-use software and website development, and other amortization 4,746us-gaap_DepreciationAndAmortization 3,253us-gaap_DepreciationAndAmortization 2,159us-gaap_DepreciationAndAmortization
Stock-based compensation 1,497us-gaap_ShareBasedCompensation 1,134us-gaap_ShareBasedCompensation 833us-gaap_ShareBasedCompensation
Other operating expense (income), net 129us-gaap_OtherOperatingIncomeExpenseNet 114us-gaap_OtherOperatingIncomeExpenseNet 154us-gaap_OtherOperatingIncomeExpenseNet
Losses (gains) on sales of marketable securities, net (3)us-gaap_GainLossOnSaleOfInvestments 1us-gaap_GainLossOnSaleOfInvestments (9)us-gaap_GainLossOnSaleOfInvestments
Other expense (income), net 62us-gaap_OtherNoncashIncomeExpense 166us-gaap_OtherNoncashIncomeExpense 253us-gaap_OtherNoncashIncomeExpense
Deferred income taxes (316)us-gaap_DeferredIncomeTaxExpenseBenefit (156)us-gaap_DeferredIncomeTaxExpenseBenefit (265)us-gaap_DeferredIncomeTaxExpenseBenefit
Excess tax benefits from stock-based compensation (6)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (78)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (429)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Changes in operating assets and liabilities:      
Inventories (1,193)us-gaap_IncreaseDecreaseInInventories (1,410)us-gaap_IncreaseDecreaseInInventories (999)us-gaap_IncreaseDecreaseInInventories
Accounts receivable, net and other (1,039)us-gaap_IncreaseDecreaseInAccountsReceivableAndOtherOperatingAssets (846)us-gaap_IncreaseDecreaseInAccountsReceivableAndOtherOperatingAssets (861)us-gaap_IncreaseDecreaseInAccountsReceivableAndOtherOperatingAssets
Accounts payable 1,759us-gaap_IncreaseDecreaseInAccountsPayable 1,888us-gaap_IncreaseDecreaseInAccountsPayable 2,070us-gaap_IncreaseDecreaseInAccountsPayable
Accrued expenses and other 706us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities 736us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities 1,038us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities
Additions to unearned revenue 4,433us-gaap_IncreaseDecreaseInDeferredRevenue 2,691us-gaap_IncreaseDecreaseInDeferredRevenue 1,796us-gaap_IncreaseDecreaseInDeferredRevenue
Amortization of previously unearned revenue (3,692)us-gaap_RecognitionOfDeferredRevenue (2,292)us-gaap_RecognitionOfDeferredRevenue (1,521)us-gaap_RecognitionOfDeferredRevenue
Net cash provided by (used in) operating activities 6,842us-gaap_NetCashProvidedByUsedInOperatingActivities 5,475us-gaap_NetCashProvidedByUsedInOperatingActivities 4,180us-gaap_NetCashProvidedByUsedInOperatingActivities
INVESTING ACTIVITIES:      
Purchases of property and equipment, including internal-use software and website development (4,893)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (3,444)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (3,785)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Acquisitions, net of cash acquired, and other (979)us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates (312)us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates (745)us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates
Sales and maturities of marketable securities and other investments 3,349us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments 2,306us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments 4,237us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments
Purchases of marketable securities and other investments (2,542)us-gaap_PaymentsToAcquireInvestments (2,826)us-gaap_PaymentsToAcquireInvestments (3,302)us-gaap_PaymentsToAcquireInvestments
Net cash provided by (used in) investing activities (5,065)us-gaap_NetCashProvidedByUsedInInvestingActivities (4,276)us-gaap_NetCashProvidedByUsedInInvestingActivities (3,595)us-gaap_NetCashProvidedByUsedInInvestingActivities
FINANCING ACTIVITIES:      
Excess tax benefits from stock-based compensation 6us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 78us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 429us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Common stock repurchased 0us-gaap_PaymentsForRepurchaseOfCommonStock 0us-gaap_PaymentsForRepurchaseOfCommonStock (960)us-gaap_PaymentsForRepurchaseOfCommonStock
Proceeds from long-term debt and other 6,359us-gaap_ProceedsFromRepaymentsOfLongTermDebtAndCapitalSecurities 394us-gaap_ProceedsFromRepaymentsOfLongTermDebtAndCapitalSecurities 3,378us-gaap_ProceedsFromRepaymentsOfLongTermDebtAndCapitalSecurities
Repayments of long-term debt (513)us-gaap_RepaymentsOfDebt (231)us-gaap_RepaymentsOfDebt (82)us-gaap_RepaymentsOfDebt
Principal repayments of capital lease obligations (1,285)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations (775)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations (486)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
Principal repayments of finance lease obligations (135)amzn_RepaymentsOfLongTermfFinancingLeaseObligations (5)amzn_RepaymentsOfLongTermfFinancingLeaseObligations (20)amzn_RepaymentsOfLongTermfFinancingLeaseObligations
Net cash provided by (used in) financing activities 4,432us-gaap_NetCashProvidedByUsedInFinancingActivities (539)us-gaap_NetCashProvidedByUsedInFinancingActivities 2,259us-gaap_NetCashProvidedByUsedInFinancingActivities
Foreign-currency effect on cash and cash equivalents (310)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (86)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (29)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net increase (decrease) in cash and cash equivalents 5,899us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 574us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 2,815us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
CASH AND CASH EQUIVALENTS, END OF PERIOD 14,557us-gaap_CashAndCashEquivalentsAtCarryingValue 8,658us-gaap_CashAndCashEquivalentsAtCarryingValue 8,084us-gaap_CashAndCashEquivalentsAtCarryingValue
SUPPLEMENTAL CASH FLOW INFORMATION:      
Cash paid for interest on long-term debt 91us-gaap_InterestPaid 97us-gaap_InterestPaid 31us-gaap_InterestPaid
Cash paid for income taxes (net of refunds) 177us-gaap_IncomeTaxesPaidNet 169us-gaap_IncomeTaxesPaidNet 112us-gaap_IncomeTaxesPaidNet
Assets Held under Capital Leases      
SUPPLEMENTAL CASH FLOW INFORMATION:      
Property and equipment acquired 4,008us-gaap_NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1
/ us-gaap_MajorPropertyClassAxis
= us-gaap_AssetsHeldUnderCapitalLeasesMember
1,867us-gaap_NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1
/ us-gaap_MajorPropertyClassAxis
= us-gaap_AssetsHeldUnderCapitalLeasesMember
802us-gaap_NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1
/ us-gaap_MajorPropertyClassAxis
= us-gaap_AssetsHeldUnderCapitalLeasesMember
Assets Held under Build-To-Suit Leases      
SUPPLEMENTAL CASH FLOW INFORMATION:      
Property and equipment acquired $ 920us-gaap_NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1
/ us-gaap_MajorPropertyClassAxis
= amzn_AssetsHeldUnderBuildToSuitLeasesMember
$ 877us-gaap_NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1
/ us-gaap_MajorPropertyClassAxis
= amzn_AssetsHeldUnderBuildToSuitLeasesMember
$ 29us-gaap_NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1
/ us-gaap_MajorPropertyClassAxis
= amzn_AssetsHeldUnderBuildToSuitLeasesMember