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Interest and other investment income (expense), net (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Interest and Other Investment Income (Expense), Net      
Interest income $ 4us-gaap_InterestIncomeOther $ 5us-gaap_InterestIncomeOther $ 6us-gaap_InterestIncomeOther
Interest expense 0us-gaap_InterestExpenseOther 0us-gaap_InterestExpenseOther (1)us-gaap_InterestExpenseOther
Interest expense from debt and amortization of debt discount and deferred financing costs (208)us-gaap_InterestExpenseDebt (58)us-gaap_InterestExpenseDebt 0us-gaap_InterestExpenseDebt
Pre-tax net realized gain (loss) on foreign exchange contracts 2atvi_GainLossOnDerivativesInOtherIncomeExpense 0atvi_GainLossOnDerivativesInOtherIncomeExpense 2atvi_GainLossOnDerivativesInOtherIncomeExpense
Interest and other investment income (expense), net $ (202)us-gaap_OtherNonoperatingIncomeExpense $ (53)us-gaap_OtherNonoperatingIncomeExpense $ 7us-gaap_OtherNonoperatingIncomeExpense