Segment Information - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Total net sales	$ 75,452	$ 59,700
Online stores
Disaggregation of Revenue [Line Items]
Total net sales	36,652	29,498
Physical stores
Disaggregation of Revenue [Line Items]
Total net sales	4,640	4,307
Third-party seller services
Disaggregation of Revenue [Line Items]
Total net sales	14,479	11,141
Subscription services
Disaggregation of Revenue [Line Items]
Total net sales	5,556	4,342
AWS
Disaggregation of Revenue [Line Items]
Total net sales	10,219	7,696
Other
Disaggregation of Revenue [Line Items]
Total net sales	$ 3,906	$ 2,716