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Virtus SGA International Growth Series  
Risk/Return: rr_RiskReturnAbstract  
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock

Virtus SGA International Growth Series (the “Series”),

a series of Virtus Variable Insurance Trust

 

Supplement dated November 20, 2020, to the Summary Prospectuses

and Statutory Prospectus, each dated April 30, 2020

 

Important Notice to Investors

 

Effective December 1, 2020, the Series’ investment adviser, Virtus Investment Advisers, Inc., will implement a new expense limitation arrangement to further limit the Series’ expenses. These changes are described in more detail below.
Risk/Return [Heading] rr_RiskReturnHeading Virtus SGA International Growth Series
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

Under “Fees and Expenses” in the Series’ summary prospectuses and the summary section of the Series’ statutory prospectus, the information in the “Annual Series Operating Expenses” tables and associated footnotes will be replaced with the following, as applicable:
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Series Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination Apr. 30, 2022
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

Under “Fees and Expenses,” the information in the “Example” table will be replaced with the following, as applicable:
Expense Example Closing [Text Block] rr_ExpenseExampleClosingTextBlock

Investors should retain this supplement with the Prospectuses for future reference.
Virtus SGA International Growth Series | Class A  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.75%
Distribution and Shareholder Servicing (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.18%
Total Annual Series Operating Expenses rr_ExpensesOverAssets 1.18%
Less: Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.04%) [1]
Total Annual Series Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 1.14% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 116
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 371
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 645
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,428
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 116
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 371
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 645
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,428
Virtus SGA International Growth Series | Class I  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.75%
Distribution and Shareholder Servicing (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.18%
Total Annual Series Operating Expenses rr_ExpensesOverAssets 0.93%
Less: Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.04%) [1]
Total Annual Series Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 0.89% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 91
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 292
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 511
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,139
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 91
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 292
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 511
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,139
[1] The Series’ investment adviser has contractually agreed to limit the Series’ total operating expenses (excluding certain expenses, such as front-end or contingent deferred sales charges, taxes, leverage and borrowing expenses (such as commitment, amendment and renewal expenses on credit or redemption facilities), interest, brokerage commissions, expenses incurred in connection with any merger or reorganization, unusual or infrequently occurring expenses (such as litigation), acquired fund fees and expenses, and dividend expenses, if any) so that such expenses do not exceed 1.14% for Class A Shares and 0.89% for Class I Shares through April 30, 2022. Following the contractual period, the Series’ investment adviser may discontinue these expense reimbursement arrangements at any time. Under certain conditions, the Series’ investment adviser may recapture operating expenses reimbursed and/or fees waived under these arrangements for a period of three years following the date such waiver or reimbursement occurred, provided that the recapture does not cause the Series to exceed its expense limit in effect at the time of the waiver or reimbursement, or at the time of recapture.