Business Combinations - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended	9 Months Ended
	Jul. 18, 2012 Yammer, Inc.	Mar. 31, 2013 Other Acquired Entities Entity
Business Acquisition [Line Items]
Name of acquired entity	Yammer, Inc. ("Yammer")
Acquisition date	Jul. 18, 2012
Cash paid to acquire the business	$ 1,100	$ 431
Goodwill acquired	937
Identifiable intangible assets acquired	$ 178
Number of entities acquired		9