Fair Value Measurements (Details 2) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2015	Jun. 30, 2014
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Asset
Level 3 measurement reconciliation, recurring basis, fair value assets beginning balance	$ 9	$ 9
Total unrealized gains included in other comprehensive income	0	0
Level 3 measurement reconciliation, recurring basis, fair value assets ending balance	$ 9	9
Maximum
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Asset
Percentage of assets measured on recurring basis at fair value using significant unobservable inputs	1.00%
Auction rate securities
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Asset
Level 3 measurement reconciliation, recurring basis, fair value assets beginning balance	$ 9	9
Total unrealized gains included in other comprehensive income	0	0
Level 3 measurement reconciliation, recurring basis, fair value assets ending balance	$ 9	$ 9

This element represents percentage of assets measured on recurring basis at fair value using significant unobservable Inputs.

No definition available.

+ Details

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Namespace Prefix:	atvi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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Period Type:	duration

- Definition

Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1a)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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Period Type:	instant

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- Details

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