Acquisitions, Goodwill, and Acquired Intangible Assets - Additional Information (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended		12 Months Ended
	Apr. 12, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired		$ 866	$ 633	$ 879	$ 678	$ 14,173	$ 765
Ring, Inc [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired	$ 853
Other 2018 Acquisitions [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred				$ 39