Restructuring - Schedule of Total Expected Pre-tax Restructuring Charges (Details) $ in Millions	Dec. 31, 2020 USD ($)
Restructuring Cost and Reserve [Line Items]
Cumulative charges incurred to date	$ 224
Total expected pre-tax restructuring charges	310
Activision
Restructuring Cost and Reserve [Line Items]
Cumulative charges incurred to date	32
Total expected pre-tax restructuring charges	42
Blizzard
Restructuring Cost and Reserve [Line Items]
Cumulative charges incurred to date	144
Total expected pre-tax restructuring charges	200
King
Restructuring Cost and Reserve [Line Items]
Cumulative charges incurred to date	19
Total expected pre-tax restructuring charges	25
Other segments
Restructuring Cost and Reserve [Line Items]
Cumulative charges incurred to date	29
Total expected pre-tax restructuring charges	$ 43