Major Classes of Assets and Liabilities Allocated Purchase Price (Detail) - USD ($) $ in Millions	Mar. 31, 2019	Oct. 25, 2018	Jun. 30, 2018
Business Acquisition [Line Items]
Goodwill	$ 41,861		$ 35,683
GitHub, Inc.
Business Acquisition [Line Items]
Cash, cash equivalents, and short-term investments		$ 234
Goodwill	5,500	5,494
Intangible assets	$ 1,300	1,267
Other assets		143
Other liabilities		(214)
Total		$ 6,924