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Acquisitions, Goodwill, and Acquired Intangible Assets Allocation of Aggregate Purchase Price of Acquisitions (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2013
May 31, 2012
Dec. 31, 2012
Allocation          
Goodwill $ 3,319us-gaap_Goodwill 2,655us-gaap_Goodwill $ 2,655us-gaap_Goodwill   $ 2,552us-gaap_Goodwill
Acquired intangibles weighted average amortization period 3 years 183 days [1]        
Minimum          
Allocation          
Intangible assets, estimated useful life   1 year      
Maximum          
Allocation          
Intangible assets, estimated useful life   10 years      
Marketing-related          
Allocation          
Acquired intangibles weighted average amortization period 5 years 110 days        
Contract-based          
Allocation          
Acquired intangibles weighted average amortization period 2 years 73 days        
Technology-based          
Allocation          
Acquired intangibles weighted average amortization period 3 years 183 days        
Customer-related          
Allocation          
Acquired intangibles weighted average amortization period 2 years 183 days        
2014 Acquisitions          
Purchase Price          
Cash paid, net of cash acquired 813us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= amzn_YearMember		        
Stock options assumed 44us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred
/ us-gaap_BusinessAcquisitionAxis
= amzn_YearMember		        
Indemnification holdback 5us-gaap_BusinessCombinationConsiderationTransferredOther1
/ us-gaap_BusinessAcquisitionAxis
= amzn_YearMember		        
Aggregate purchase price 862us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= amzn_YearMember		        
Allocation          
Goodwill 707us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= amzn_YearMember		        
Intangible assets 230us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= amzn_YearMember		 [2]        
Property and equipment 16us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= amzn_YearMember		        
Deferred tax assets 64us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= amzn_YearMember		        
Other assets acquired 34us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= amzn_YearMember		        
Deferred tax liabilities 88us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= amzn_YearMember		        
Other liabilities assumed 101us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= amzn_YearMember		        
Business acquisition, allocation 862us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= amzn_YearMember		        
Acquired intangibles weighted average amortization period 5 years        
2014 Acquisitions | Minimum          
Allocation          
Intangible assets, estimated useful life 1 year        
2014 Acquisitions | Maximum          
Allocation          
Intangible assets, estimated useful life 5 years        
2014 Acquisitions | Marketing-related          
Allocation          
Intangible assets 23us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= amzn_YearMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_MarketingRelatedIntangibleAssetsMember		 [2]        
2014 Acquisitions | Contract-based          
Allocation          
Intangible assets 1us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= amzn_YearMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ContractBasedIntangibleAssetsMember		 [2]        
2014 Acquisitions | Technology-based          
Allocation          
Intangible assets 33us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= amzn_YearMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TechnologyBasedIntangibleAssetsMember		 [2]        
2014 Acquisitions | Customer-related          
Allocation          
Intangible assets 173us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= amzn_YearMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelatedIntangibleAssetsMember		 [2]        
Series of Individually Immaterial Business Acquisitions          
Purchase Price          
Aggregate purchase price 20us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember		   195us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember		    
Allocation          
Goodwill   103us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember		 103us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember		    
Kiva Systems, Inc          
Purchase Price          
Cash paid, net of cash acquired       613us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= amzn_KivaSystemsIncorporatedMember		  
Stock options assumed       65us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred
/ us-gaap_BusinessAcquisitionAxis
= amzn_KivaSystemsIncorporatedMember		  
Aggregate purchase price       678us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= amzn_KivaSystemsIncorporatedMember		  
Allocation          
Goodwill       560us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= amzn_KivaSystemsIncorporatedMember		  
Intangible assets       193us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= amzn_KivaSystemsIncorporatedMember		 [3]  
Property and equipment       9us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= amzn_KivaSystemsIncorporatedMember		  
Deferred tax assets       34us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= amzn_KivaSystemsIncorporatedMember		  
Other assets acquired       41us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= amzn_KivaSystemsIncorporatedMember		  
Deferred tax liabilities       81us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= amzn_KivaSystemsIncorporatedMember		  
Other liabilities assumed       78us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= amzn_KivaSystemsIncorporatedMember		  
Acquired intangibles weighted average amortization period     5 years    
Kiva Systems, Inc | Minimum          
Allocation          
Intangible assets, estimated useful life     4 years    
Kiva Systems, Inc | Maximum          
Allocation          
Intangible assets, estimated useful life     10 years    
Kiva Systems, Inc | Marketing-related          
Allocation          
Intangible assets       5us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= amzn_KivaSystemsIncorporatedMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_MarketingRelatedIntangibleAssetsMember		 [3]  
Kiva Systems, Inc | Contract-based          
Allocation          
Intangible assets       3us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= amzn_KivaSystemsIncorporatedMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ContractBasedIntangibleAssetsMember		 [3]  
Kiva Systems, Inc | Technology-based          
Allocation          
Intangible assets       168us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= amzn_KivaSystemsIncorporatedMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TechnologyBasedIntangibleAssetsMember		 [3]  
Kiva Systems, Inc | Customer-related          
Allocation          
Intangible assets       $ 17us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= amzn_KivaSystemsIncorporatedMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelatedIntangibleAssetsMember		 [3]  
[1] Intangible assets have estimated useful lives of between one and 10 years.
[2] Acquired intangible assets have estimated useful lives of between one and five years, with a weighted-average amortization period of five years.
[3] Acquired intangible assets have estimated useful lives of between four and 10 years, with a weighted-average amortization period of five years.