Segment Information - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Total net sales	$ 88,912	$ 63,404	$ 164,364	$ 123,104
Online stores
Disaggregation of Revenue [Line Items]
Total net sales	45,896	31,053	82,549	60,552
Physical stores
Disaggregation of Revenue [Line Items]
Total net sales	3,774	4,330	8,414	8,636
Third-party seller services
Disaggregation of Revenue [Line Items]
Total net sales	18,195	11,962	32,676	23,104
Subscription services
Disaggregation of Revenue [Line Items]
Total net sales	6,018	4,676	11,574	9,018
AWS
Disaggregation of Revenue [Line Items]
Total net sales	10,808	8,381	21,027	16,076
Other
Disaggregation of Revenue [Line Items]
Total net sales	$ 4,221	$ 3,002	$ 8,124	$ 5,718