Acquired Intangible Assets (Detail) (Yammer, Inc., USD $) In Millions, unless otherwise specified	1 Months Ended
	Jul. 18, 2012
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets acquired	$ 178
Weighted Average Life	5 years
Customer-related
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets acquired	77
Weighted Average Life	6 years
Technology-based
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets acquired	67
Weighted Average Life	4 years
Marketing-related
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets acquired	$ 34
Weighted Average Life	7 years