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Equity Method Investments - Additional Information of LivingSocial (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]    
LivingSocial assets held-for-sale   $ 146amzn_EquityMethodInvestmentSummarizedFinancialInformationAssetsHeldforsale
Living Social liabilities held-for-sale   122amzn_EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesofAssetsHeldforsale
LivingSocial total investment, book value $ 75amzn_EquityAndCostMethodInvestmentBookValue  
LivingSocial total investment, ownership percentage 31.00%amzn_EquityAndCostMethodInvestmentOwnershipPercentage