Segment Information - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Total net sales	$ 69,981	$ 56,576	$ 193,086	$ 160,504
Online stores
Disaggregation of Revenue [Line Items]
Total net sales	35,039	29,061	95,590	83,165
Physical stores
Disaggregation of Revenue [Line Items]
Total net sales	4,192	4,248	12,829	12,824
Third-party seller services
Disaggregation of Revenue [Line Items]
Total net sales	13,212	10,395	36,316	29,361
Subscription services
Disaggregation of Revenue [Line Items]
Total net sales	4,957	3,698	13,975	10,209
AWS
Disaggregation of Revenue [Line Items]
Total net sales	8,995	6,679	25,072	18,225
Other
Disaggregation of Revenue [Line Items]
Total net sales	$ 3,586	$ 2,495	$ 9,304	$ 6,720