Segment Information - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Net sales	$ 52,886	$ 37,955	$ 103,928	$ 73,669
Online stores (1)
Disaggregation of Revenue [Line Items]
Net sales	27,165	23,754	54,105	46,580
Physical stores (2)
Disaggregation of Revenue [Line Items]
Net sales	4,312		8,575
Third-party seller services (3)
Disaggregation of Revenue [Line Items]
Net sales	9,702	6,991	18,966	13,429
Subscription services (4)
Disaggregation of Revenue [Line Items]
Net sales	3,408	2,165	6,510	4,104
AWS
Disaggregation of Revenue [Line Items]
Net sales	6,105	4,100	11,547	7,761
Other (5)
Disaggregation of Revenue [Line Items]
Net sales	$ 2,194	$ 945	$ 4,225	$ 1,795