Segment Information - Net Sales of Similar Products and Services (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenue from External Customer [Line Items]
Net sales	$ 37,955	$ 30,404	$ 73,669	$ 59,532
Retail products
Revenue from External Customer [Line Items]
Net sales	23,754	20,378	46,580	40,293
Retail third-party seller services
Revenue from External Customer [Line Items]
Net sales	6,991	5,083	13,429	9,885
Retail subscription services
Revenue from External Customer [Line Items]
Net sales	2,165	1,431	4,104	2,732
AWS
Revenue from External Customer [Line Items]
Net sales	4,100	2,886	7,761	5,452
Other
Revenue from External Customer [Line Items]
Net sales	$ 945	$ 626	$ 1,795	$ 1,170