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 true    
Amendment Description EXPLANATORY NOTE This Amendment No. 1 is being filed solely for the purpose of removing the inadvertent inclusion of the parenthetical label, (Unaudited), which was inserted below the header on page F-4 of the financial statements in the original annual report on Form 10-K for the year ended December 31, 2012. In addition, we are re-filing Exhibit 21 in its entirety to clarify the jurisdiction of incorporation for one of our entities. Except for these changes, there have been no other changes in any of the financial or other information contained in the original report. For convenience, we are re-filing the report, in its entirety, including the Extensible Business Reporting Language (XBRL) interactive data files as Exhibit 101 to reflect the information presented in the annual report on Form 10-K/A, except that certain exhibits which were filed with the original report have been incorporated by reference from that original report. This amendment continues to speak as of the date of the original filing and the Company has not updated the disclosure in this amendment to speak to any later date. Any references to the Form 10-K in this periodic report shall be deemed to be references to this Form 10-K/A.    
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