Subsequent events (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	6 Months Ended		0 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jul. 25, 2013 Subsequent Events Expected	Jul. 25, 2013 Subsequent Events Expected Revolving Credit Facility	Jul. 25, 2013 Subsequent Events Expected ASAC	Jul. 25, 2013 Subsequent Events Expected Activision Blizzard
Subsequent Events - Related Party Transactions
Treasury Stock, Acquired, Shares						429
Treasury Stock, Acquired, Value						$ 5,830,000,000
Treasury Stock, Price Per Share						$ 13.60
Capital Contribution into ASAC by Related Parties					100,000,000
Stock Purchased By ASAC, Shares					172
Stock Purchased By ASAC, Value					2,340,000,000
Stock Purchased By ASAC, Price Per Share					$ 13.60
Subsequent Events - Credit Facility
Cash Payments for Repurchase of Common Stock	0	315,000,000	1,200,000,000
Proceeds From Issuance of Total Debt			4,750,000,000
Proceeds from Secured Credit Facilities				250,000,000
Net Debt			1,400,000,000
Long-term Debt			$ 4,750,000,000