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Summary of significant accounting policies (Details 3) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Allowance for returns and price protection      
Impact of a one percent change in the allowances for sales returns, price protection and other allowances on net revenues $ 4atvi_ImpactOnNetRevenuesByOnePercentageChangeInAllowanceForReturnsAndPriceProtection    
Advertising Expenses      
Advertising expense included in sales and marketing expense $ 495us-gaap_AdvertisingExpense $ 401us-gaap_AdvertisingExpense $ 396us-gaap_AdvertisingExpense
Minimum      
Revenue Recognition      
Estimated service period over which revenues are recognized 5 months    
Maximum      
Revenue Recognition      
Estimated service period over which revenues are recognized 1 year