Summary of Significant Accounting Policies - Estimated Service Period (Details)	12 Months Ended
Dec. 31, 2019
Revenue, Performance Obligation [Abstract]
Estimated service period over which revenues are recognized (less than)	12 months

This element represents the service period over which revenues are recognized for games for which we have an online hosted software arrangement, or an implied obligation to display virtual goods, or there is significant online functionality that is a separate performance obligation.

No definition available.

Name:	atvi_EstimatedServicePeriod
Namespace Prefix:	atvi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration