Contingencies - Additional Information (Detail) (USD $)	1 Months Ended
	Sep. 30, 2013	Mar. 31, 2015
Antitrust, Unfair Competition, And Overcharge Class Actions | United States
Loss Contingencies [Line Items]
Accrual for loss contingency, ending balance		$ 200,000,000
Contingencies Disclosed in Contingencies Note
Loss Contingencies [Line Items]
Accrual for disclosed loss contingencies, current, ending balance		640,000,000
Accrual for disclosed loss contingencies, noncurrent, ending balance		30,000,000
Amount not accrued for estimated maximum losses for disclosed loss contingencies		1,900,000,000
Patent And Intellectual Property Claims | US State District Court | Microsoft, Plaintiff
Loss Contingencies [Line Items]
Damages awarded value	$ 14,500,000