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Stockholders' Equity Scheduled Vesting for Outstanding Restricted Stock Units (Detail) (Restricted Stock Units)
In Millions, unless otherwise specified
Mar. 31, 2015
Restricted Stock Units
  
Schedule of Vesting [Line Items]  
Nine Months Ended December 31, 2015 4.9amzn_ScheduledVestingRemainderOfYear
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Year Ended December 31, 2016 6.0amzn_ScheduledVestingYearOne
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Year Ended December 31, 2017 3.7amzn_ScheduledVestingYearTwo
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Year Ended December 31, 2018 2.1amzn_ScheduledVestingYearThree
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Year Ended December 31, 2019 0.5amzn_ScheduledVestingYearFour
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Thereafter 0.2amzn_ScheduledVestingThereafter
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Total 17.4amzn_ScheduledVestingDisclosure
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember