Restructuring - Total Restructuring and Related Costs by Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs	$ 30	$ 23
2019 Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs	27	23
2019 Restructuring | Activision
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs	1	2
2019 Restructuring | Blizzard
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs	23	21
2019 Restructuring | King
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs	1	(1)
2019 Restructuring | Other segments
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs	$ 2	$ 1