Base Rate Margin for debt instrument.

No definition available.

Name:	atvi_DebtInstrumentBaseRateMargin
Namespace Prefix:	atvi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum end of range for Consolidated Total Assets Ratio financial covenant for our long term debt.

+ References

No definition available.

+ Details

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

- Definition

Maximum end of range for Consolidated Total Net Debt Ratio financial covenant for our long term debt.

+ References

No definition available.

+ Details

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

- Definition

The maximum end of range for Consolidated Total Net Debt Ratio financial covenant for our long term debt at the Company’s option and for a limited period of time upon the consummation of a Qualifying Acquisition.

+ References

No definition available.

+ Details

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

- Definition

Variable Rate Interest Floor.

+ References

No definition available.

+ Details

Name:	atvi_DebtInstrumentVariableRateInterestFloor
Namespace Prefix:	atvi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Write off of unamortized discount (premium) and deferred financing costs as a result of extinguishment.

+ References

No definition available.

+ Details

Name:	atvi_WriteOffOfUnamortizedDiscountPremiumAndDeferredDebtIssuanceCosts
Namespace Prefix:	atvi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

Name:	us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

+ Details

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585

+ Details

Name:	us-gaap_RepaymentsOfLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=atvi_CreditAgreementSeventhAmendmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_FederalFundsEffectiveSwapRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=atvi_A2017TrancheATermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debt - Credit Facilities (Details) - USD ($) $ in Millions		9 Months Ended
Debt - Credit Facilities (Details) - USD ($) $ in Millions	Aug. 24, 2018	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Line of Credit Facility [Line Items]
Amount outstanding		$ 2,700		$ 4,440
Repayment of long-term debt		1,740	$ 4,251
Revolver
Line of Credit Facility [Line Items]
Maximum borrowing capacity				250
Revolver \| Credit Agreement, Seventh Amendment
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 1,500
Long-term Line of Credit		$ 0
Line of Credit
Line of Credit Facility [Line Items]
Debt instrument, covenant, consolidated total net debt ratio, maximum		375.00%
Debt instrument, covenant, consolidated total net debt ratio, qualifying acquisition		425.00%
Debt instrument, covenant, consolidated total assets ratio, maximum		7.50%
Line of Credit \| Revolver \| Credit Agreement, Seventh Amendment \| Federal Funds Effective Swap Rate
Line of Credit Facility [Line Items]
Debt instrument, base rate margin		0.50%
Line of Credit \| Revolver \| Credit Agreement, Seventh Amendment \| London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Debt instrument, base rate margin		1.00%
Debt instrument, variable rate, interest floor		0.00%
Line of Credit \| Revolver \| Credit Agreement, Seventh Amendment \| London Interbank Offered Rate (LIBOR) \| Minimum
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate		0.875%
Line of Credit \| Revolver \| Credit Agreement, Seventh Amendment \| London Interbank Offered Rate (LIBOR) \| Maximum
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate		1.375%
Line of Credit \| Revolver \| Credit Agreement, Seventh Amendment \| Base Rate
Line of Credit Facility [Line Items]
Debt instrument, variable rate, interest floor		1.00%
Line of Credit \| Revolver \| Credit Agreement, Seventh Amendment \| Base Rate \| Minimum
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate		0.00%
Line of Credit \| Revolver \| Credit Agreement, Seventh Amendment \| Base Rate \| Maximum
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate		0.375%
Line of Credit \| 2017 TLA
Line of Credit Facility [Line Items]
Amount outstanding				$ 990
Repayment of long-term debt	990
Write-off of unamortized discount and financing costs	$ 7