Contingencies - Additional Information (Detail) - USD ($) $ in Millions |
12 Months Ended | |
---|---|---|
Dec. 31, 2013 |
Sep. 30, 2015 |
|
Antitrust, Unfair Competition, And Overcharge Class Actions | United States | ||
Loss Contingencies [Line Items] | ||
Accrual for loss contingency, ending balance | $ 100.0 | |
Contingencies Disclosed in Contingencies Note | ||
Loss Contingencies [Line Items] | ||
Accrual for disclosed loss contingencies, current, ending balance | 551.0 | |
Accrual for disclosed loss contingencies, noncurrent, ending balance | 17.0 | |
Amount not accrued for estimated maximum losses for disclosed loss contingencies | $ 1,500.0 | |
Patent And Intellectual Property Claims | US State District Court | Microsoft, Plaintiff | ||
Loss Contingencies [Line Items] | ||
Damages awarded value | $ 14.5 |