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Stockholders' Equity Scheduled Vesting for Outstanding Restricted Stock Units (Detail) (Restricted Stock Units)
In Millions, unless otherwise specified
Dec. 31, 2014
Restricted Stock Units
  
Schedule of Vesting [Line Items]  
2015 5.9amzn_ScheduledVestingYearOne
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
2016 6.1amzn_ScheduledVestingYearTwo
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
2017 3.4amzn_ScheduledVestingYearThree
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
2018 1.7amzn_ScheduledVestingYearFour
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
2019 0.2amzn_ScheduledVestingYearFive
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Thereafter 0.1amzn_ScheduledVestingThereafter
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Total 17.4amzn_ScheduledVestingDisclosure
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember