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Long-Term Debt Long-Term Debt Obligations (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Other long-term debt $ 881us-gaap_OtherLongTermDebt $ 967us-gaap_OtherLongTermDebt
Total debt 9,881us-gaap_LongTermDebt 3,967us-gaap_LongTermDebt
Less current portion of long-term debt (1,520)us-gaap_LongTermDebtCurrent (753)us-gaap_LongTermDebtCurrent
Face value of long-term debt 8,361us-gaap_DebtInstrumentCarryingAmount 3,214us-gaap_DebtInstrumentCarryingAmount
0.65% Notes due on November 27, 2015    
Debt Instrument [Line Items]    
Stated interest rate 0.65%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= amzn_SeniorUnsecuredNotesZeroPointSixFivePercentDueNovemberTwentySevenTwoThousandFifteenMember		  
Total debt 750us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= amzn_SeniorUnsecuredNotesZeroPointSixFivePercentDueNovemberTwentySevenTwoThousandFifteenMember		 [1] 750us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= amzn_SeniorUnsecuredNotesZeroPointSixFivePercentDueNovemberTwentySevenTwoThousandFifteenMember		 [1]
Effective interest rate 0.84%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= amzn_SeniorUnsecuredNotesZeroPointSixFivePercentDueNovemberTwentySevenTwoThousandFifteenMember		  
1.20% Notes due on November 29, 2017    
Debt Instrument [Line Items]    
Stated interest rate 1.20%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= amzn_SeniorUnsecuredNotesOnePointTwoPercentDueNovemberTwentyNineTwoThousandSeventeenMember		  
Total debt 1,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= amzn_SeniorUnsecuredNotesOnePointTwoPercentDueNovemberTwentyNineTwoThousandSeventeenMember		 [1] 1,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= amzn_SeniorUnsecuredNotesOnePointTwoPercentDueNovemberTwentyNineTwoThousandSeventeenMember		 [1]
Effective interest rate 1.38%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= amzn_SeniorUnsecuredNotesOnePointTwoPercentDueNovemberTwentyNineTwoThousandSeventeenMember		  
Senior Unsecured Notes Two Point Five Percent Due November Twenty Nine Two Thousand Twenty Two [Member]    
Debt Instrument [Line Items]    
Stated interest rate 2.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= amzn_SeniorUnsecuredNotesTwoPointFivePercentDueNovemberTwentyNineTwoThousandTwentyTwoMember		  
Total debt 1,250us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= amzn_SeniorUnsecuredNotesTwoPointFivePercentDueNovemberTwentyNineTwoThousandTwentyTwoMember		 [1] 1,250us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= amzn_SeniorUnsecuredNotesTwoPointFivePercentDueNovemberTwentyNineTwoThousandTwentyTwoMember		 [1]
Effective interest rate 2.66%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= amzn_SeniorUnsecuredNotesTwoPointFivePercentDueNovemberTwentyNineTwoThousandTwentyTwoMember		  
2.60% Notes due on December 5, 2019    
Debt Instrument [Line Items]    
Stated interest rate 2.60%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= amzn_SeniorUnsecuredNotesTwoPointSixPercentDueDecemberFifthTwoThousandNineteenMemberMember		  
Total debt 1,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= amzn_SeniorUnsecuredNotesTwoPointSixPercentDueDecemberFifthTwoThousandNineteenMemberMember		 [2] 0us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= amzn_SeniorUnsecuredNotesTwoPointSixPercentDueDecemberFifthTwoThousandNineteenMemberMember		 [2]
Effective interest rate 2.73%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= amzn_SeniorUnsecuredNotesTwoPointSixPercentDueDecemberFifthTwoThousandNineteenMemberMember		  
3.30% Notes due on December 5, 2021    
Debt Instrument [Line Items]    
Stated interest rate 3.30%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= amzn_SeniorUnsecuredNotesThreePointThreePercentDueDecemberFifthTwoThousandTwentyOneMember		  
Total debt 1,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= amzn_SeniorUnsecuredNotesThreePointThreePercentDueDecemberFifthTwoThousandTwentyOneMember		 [2] 0us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= amzn_SeniorUnsecuredNotesThreePointThreePercentDueDecemberFifthTwoThousandTwentyOneMember		 [2]
Effective interest rate 3.43%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= amzn_SeniorUnsecuredNotesThreePointThreePercentDueDecemberFifthTwoThousandTwentyOneMember		  
3.80% Notes due on December 5, 2024    
Debt Instrument [Line Items]    
Stated interest rate 3.80%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= amzn_SeniorUnsecuredNotesThreePointEightPercentDueDecemberFifthTwoThousandTwentyFourMember		  
Total debt 1,250us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= amzn_SeniorUnsecuredNotesThreePointEightPercentDueDecemberFifthTwoThousandTwentyFourMember		 [2] 0us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= amzn_SeniorUnsecuredNotesThreePointEightPercentDueDecemberFifthTwoThousandTwentyFourMember		 [2]
Effective interest rate 3.90%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= amzn_SeniorUnsecuredNotesThreePointEightPercentDueDecemberFifthTwoThousandTwentyFourMember		  
4.80% Notes due on December 5, 2034    
Debt Instrument [Line Items]    
Stated interest rate 4.80%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= amzn_SeniorUnsecuredNotesFourPointEightPercentDueDecemberFifthTwoThousandThirtyFourMember		  
Total debt 1,250us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= amzn_SeniorUnsecuredNotesFourPointEightPercentDueDecemberFifthTwoThousandThirtyFourMember		 [2] 0us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= amzn_SeniorUnsecuredNotesFourPointEightPercentDueDecemberFifthTwoThousandThirtyFourMember		 [2]
Effective interest rate 4.92%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= amzn_SeniorUnsecuredNotesFourPointEightPercentDueDecemberFifthTwoThousandThirtyFourMember		  
4.95% Notes due on December 5, 2044    
Debt Instrument [Line Items]    
Stated interest rate 4.95%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= amzn_SeniorUnsecuredNotesFourPointNineFivePercentDueDecemberFifthTwoThousandFortyFourMember		  
Total debt $ 1,500us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= amzn_SeniorUnsecuredNotesFourPointNineFivePercentDueDecemberFifthTwoThousandFortyFourMember		 [2] $ 0us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= amzn_SeniorUnsecuredNotesFourPointNineFivePercentDueDecemberFifthTwoThousandFortyFourMember		 [2]
Effective interest rate 5.11%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= amzn_SeniorUnsecuredNotesFourPointNineFivePercentDueDecemberFifthTwoThousandFortyFourMember		  
[1] Issued in November 2012, effective interest rates of the 2015, 2017, and 2022 Notes were 0.84%, 1.38%, and 2.66%
[2] Issued in December 2014, effective interest rates of the 2019, 2021, 2024, 2034, and 2044 Notes were 2.73%, 3.43%, 3.90%, 4.92%, and 5.11%.