Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2020	Feb. 16, 2021	Jun. 30, 2020
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2020
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	1-15839
Entity Registrant Name	ACTIVISION BLIZZARD, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	95-4803544
Entity Address, Address Line One	3100 Ocean Park Boulevard
Entity Address, City or Town	Santa Monica,
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	90405
City Area Code	310
Local Phone Number	255-2000
Title of 12(b) Security	Common Stock, par value $0.000001 per share
Trading Symbol	ATVI
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 58,006,915,377
Entity Common Stock, Shares Outstanding		774,753,965
Documents Incorporated by Reference	Portions of the registrant’s Proxy Statement for the 2021 Annual Meeting of Stockholders are incorporated herein by reference into Part III of this Form 10-K to the extent stated herein. The 2021 Proxy Statement will be filed with the U.S. Securities and Exchange Commission within 120 days of the registrant’s fiscal year ended December 31, 2020.
Entity Central Index Key	0000718877
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Amendment Flag	false