Segment Information - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Total net sales	$ 87,437	$ 69,981	$ 63,404	$ 59,700	$ 72,383	$ 56,576	$ 52,886	$ 51,042	$ 280,522	$ 232,887	$ 177,866
Online stores
Disaggregation of Revenue [Line Items]
Total net sales									141,247	122,987	108,354
Physical stores
Disaggregation of Revenue [Line Items]
Total net sales									17,192	17,224	5,798
Third-party seller services
Disaggregation of Revenue [Line Items]
Total net sales									53,762	42,745	31,881
Subscription services
Disaggregation of Revenue [Line Items]
Total net sales									19,210	14,168	9,721
AWS
Disaggregation of Revenue [Line Items]
Total net sales									35,026	25,655	17,459
Other
Disaggregation of Revenue [Line Items]
Total net sales									$ 14,085	$ 10,108	$ 4,653