Segment Information - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Total net sales	$ 63,404	$ 52,886	$ 123,104	$ 103,928
Online stores
Disaggregation of Revenue [Line Items]
Total net sales	31,053	27,165	60,552	54,105
Physical stores
Disaggregation of Revenue [Line Items]
Total net sales	4,330	4,312	8,636	8,575
Third-party seller services
Disaggregation of Revenue [Line Items]
Total net sales	11,962	9,702	23,104	18,966
Subscription services
Disaggregation of Revenue [Line Items]
Total net sales	4,676	3,408	9,018	6,510
AWS
Disaggregation of Revenue [Line Items]
Total net sales	8,381	6,105	16,076	11,547
Other
Disaggregation of Revenue [Line Items]
Total net sales	$ 3,002	$ 2,194	$ 5,718	$ 4,225