Segment Information - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Total net sales	$ 96,145	$ 69,981	$ 260,509	$ 193,086
Online stores
Disaggregation of Revenue [Line Items]
Total net sales	48,350	35,039	130,899	95,590
Physical stores
Disaggregation of Revenue [Line Items]
Total net sales	3,788	4,192	12,201	12,829
Third-party seller services
Disaggregation of Revenue [Line Items]
Total net sales	20,436	13,212	53,121	36,316
Subscription services
Disaggregation of Revenue [Line Items]
Total net sales	6,572	4,957	18,146	13,975
AWS
Disaggregation of Revenue [Line Items]
Total net sales	11,601	8,995	32,628	25,072
Other
Disaggregation of Revenue [Line Items]
Total net sales	$ 5,398	$ 3,586	$ 13,514	$ 9,304