Document and Entity Information (USD $)
12 Months Ended
Dec. 31, 2012
Feb. 15, 2013
Jun. 29, 2012
Document and Entity Information      
Entity Registrant Name Activision Blizzard, Inc.    
Entity Central Index Key 0000718877    
Document Type 10-K    
Document Period End Date Dec. 31, 2012    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Large Accelerated Filer    
Entity Public Float     $ 4,910,586,488
Entity Common Stock, Shares Outstanding   1,113,696,788  
Document Fiscal Year Focus 2012    
Document Fiscal Period Focus FY