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Cash and Cash Equivalents (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cash and Cash Equivalents        
Cash $ 333us-gaap_Cash $ 377us-gaap_Cash    
Foreign government treasury bills 40atvi_ForeignGovernmentTreasuryBills 33atvi_ForeignGovernmentTreasuryBills    
Money market funds 4,475us-gaap_MoneyMarketFundsAtCarryingValue 4,000us-gaap_MoneyMarketFundsAtCarryingValue    
Cash and cash equivalents $ 4,848us-gaap_CashAndCashEquivalentsAtCarryingValue $ 4,410us-gaap_CashAndCashEquivalentsAtCarryingValue $ 3,959us-gaap_CashAndCashEquivalentsAtCarryingValue $ 3,165us-gaap_CashAndCashEquivalentsAtCarryingValue