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Commitments and contingencies (Details) (USD $)
In Millions
Dec. 31, 2010
Infinity Ward
Jun. 30, 2010
West and Zampella
Commitments and contingencies: [Line Items]    
Minimum amount of damages sought by plaintiff, including punitive damages, and declaratory relief   $ 36
Bonuses and other compensation allegedly owed, minimum 75  
Bonuses and other compensation allegedly owed, maximum $ 125