Restructuring - Total Restructuring and Related Costs by Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs	$ 94	$ 132	$ 10
2019 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs	87	132
Activision | 2019 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs	13	19
Blizzard | 2019 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs	71	68
King | 2019 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs	(1)	20
Other segments | 2019 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs	$ 4	$ 25