Acquisitions, Goodwill, and Acquired Intangible Assets - Additional Information (Details) - USD ($) $ in Millions					12 Months Ended
	Sep. 11, 2018	Apr. 12, 2018	Aug. 28, 2017	May 12, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Acquisitions, net of cash acquired					$ 2,186	$ 13,972	$ 116
Other Acquisitions
Business Acquisition [Line Items]
Aggregate purchase price					$ 57	$ 204	$ 103
Souq
Business Acquisition [Line Items]
Acquisitions, net of cash acquired				$ 583
Whole Foods Market
Business Acquisition [Line Items]
Acquisitions, net of cash acquired			$ 13,200
Ring Inc.
Business Acquisition [Line Items]
Acquisitions, net of cash acquired		$ 839
PillPack, Inc.
Business Acquisition [Line Items]
Acquisitions, net of cash acquired	$ 753