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Income Taxes (Details 3) (USD $)
In Millions, unless otherwise specified
12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Oct. 11, 2013
Income Tax [Line Items]        
R&D Tax Credit $ 24us-gaap_IncomeTaxReconciliationTaxCreditsResearch $ 49us-gaap_IncomeTaxReconciliationTaxCreditsResearch $ 10us-gaap_IncomeTaxReconciliationTaxCreditsResearch  
Potential Future Tax Benefit 146us-gaap_IncomeTaxExpenseBenefit 309us-gaap_IncomeTaxExpenseBenefit 309us-gaap_IncomeTaxExpenseBenefit  
Tax Increase Prevention Act of 2014        
Income Tax [Line Items]        
R&D Tax Credit 9us-gaap_IncomeTaxReconciliationTaxCreditsResearch
/ atvi_ResearchAndDevelopmentTypeAxis
= atvi_TaxIncreasePreventionActMember
     
American Taxpayer Relief Act of 2012        
Income Tax [Line Items]        
R&D Tax Credit     12us-gaap_IncomeTaxReconciliationTaxCreditsResearch
/ atvi_ResearchAndDevelopmentTypeAxis
= atvi_AmericanTaxPayerReliefActMember
 
New VH        
Income Tax [Line Items]        
Net Operating Loss Carryforwards       760us-gaap_OperatingLossCarryforwards
/ atvi_NetOperatingLossAllocationAxis
= atvi_NewVHMember
Net operating loss utilized - New VH NOL 148atvi_NetOperatingLossUtilized
/ atvi_NetOperatingLossAllocationAxis
= atvi_NewVHMember
45atvi_NetOperatingLossUtilized
/ atvi_NetOperatingLossAllocationAxis
= atvi_NewVHMember
   
Net Operating Loss Carryforward Indemnification Amount Obtained       200atvi_NOLIndemnificationAmount
/ atvi_NetOperatingLossAllocationAxis
= atvi_NewVHMember
Indemnification asset recorded in other assets 68atvi_IndemnificationAssetRecordedInOtherAssets
/ atvi_NetOperatingLossAllocationAxis
= atvi_NewVHMember
     
Indemnification asset recorded in treasury stock 68atvi_IndemnificationAssetRecordedInTreasuryStock
/ atvi_NetOperatingLossAllocationAxis
= atvi_NewVHMember
     
Vivendi Games        
Income Tax [Line Items]        
Net Operating Loss Carryforwards     132us-gaap_OperatingLossCarryforwards
/ atvi_NetOperatingLossAllocationAxis
= atvi_VivendiGamesMember
 
Expected | New VH        
Income Tax [Line Items]        
Potential Future Tax Benefit       $ (266)us-gaap_IncomeTaxExpenseBenefit
/ atvi_NetOperatingLossAllocationAxis
= atvi_NewVHMember
/ us-gaap_StatementScenarioAxis
= atvi_ExpectedMember