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Virtus KAR Capital Growth Series  
Risk/Return: oef_RiskReturnAbstract  
Risk/Return [Heading] oef_RiskReturnHeading Virtus KAR Capital Growth Series
Objective [Heading] oef_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] oef_ObjectivePrimaryTextBlock

The Series has an investment objective of long-term growth of capital.
Expense Heading [Optional Text] oef_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] oef_ExpenseNarrativeTextBlock

The following table describes the fees and expenses you may pay if you buy, hold and sell shares of the Virtus KAR Capital Growth Series. The table does not include any fees or sales charges imposed under the variable contracts for which the Series is an investment option. If they were included, your costs would be higher.
Shareholder Fees Caption [Optional Text] oef_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Optional Text] oef_OperatingExpensesCaption Annual Series Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] oef_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] oef_PortfolioTurnoverTextBlock

The Series pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in Annual Series Operating Expenses or in the Example, affect the Series’ performance. During the most recent fiscal year, the Series’ portfolio turnover rate was 14% of the average value of its portfolio.

Portfolio Turnover, Rate oef_PortfolioTurnoverRate 14.00%
Expense Example [Heading] oef_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] oef_ExpenseExampleNarrativeTextBlock

This example is intended to help you compare the cost of investing in the Series with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Series for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year, that the Series’ total operating expenses remain the same and that the expense reimbursement arrangement remains in place for the contractual period. The example does not reflect variable contract fees and charges, and if it did, the costs shown would be higher. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example by, Year, Caption [Text] oef_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] oef_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] oef_StrategyNarrativeTextBlock

The Series invests in a select group of large market capitalization growth companies believed by the Series’ subadviser to be undervalued relative to their future growth potential. The investment strategy emphasizes companies the subadviser believes to have a sustainable competitive advantage, strong management and low financial risk, and to be able to grow over market cycles. Although the Series invests primarily in U.S. companies, it may invest in foreign securities and depositary receipts.

Under normal conditions, the Series invests at least 80% of its assets in equity securities of large capitalization companies. The subadviser considers large capitalization companies for this purpose to be those companies that, at the time of initial purchase, have market capitalizations within the range of the Russell 1000® Growth Index on a rolling three-year basis. Because large capitalization companies are defined by reference to an index, the market capitalization of companies in which the Series may invest may vary with market conditions. As of December 31, 2025, the total market capitalization range of companies included in the Russell 1000® Growth Index over the past three years was $389.2 million to $4.92 trillion. The Series may also invest in small and medium capitalization companies. Generally, the Series invests in approximately 25-50 securities at any given time.
Bar Chart and Performance Table [Heading] oef_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] oef_PerformanceNarrativeTextBlock

The following bar chart and table provide some indication of the risks of investing in the Series. The bar chart shows changes in the Series’ performance from year to year over a 10-year period. The Series’ past performance is not necessarily an indication of how the Series will perform in the future. The table shows how the Series’ average annual returns compare to those of a broad-based securities market index and a style-specific index that reflects the market sectors in which the Series invests. The Series’ returns in the chart and table do not reflect the deduction of any separate account or variable contract charges. The returns would have been less than those shown if such charges were deducted. Updated performance information is available at virtus.com or by calling 800-367-5877.

Performance Information Illustrates Variability of Returns [Text] oef_PerformanceInformationIllustratesVariabilityOfReturns The following bar chart and table provide some indication of the risks of investing in the Series.
Performance Additional Market Index [Text] oef_PerformanceAdditionalMarketIndex The Russell 1000® Growth Index is a free float-adjusted market capitalization-weighted index of growth-oriented stocks of the 1,000 largest companies in the Russell universe, which comprises the 3,000 largest U.S. companies. Effective March 24, 2025, the index applies a capping methodology. Index constituents are capped quarterly so that no more than 22.5% of the index weight may be allocated to a single constituent, and the sum of the weights of all constituents representing more than 4.5% of the index should not exceed 45% of the total index weight. For periods prior to March 24, 2025, the index was uncapped. The index is calculated on a total-return basis with dividends reinvested. The index is unmanaged and not available for direct investment.
Performance Availability Phone [Text] oef_PerformanceAvailabilityPhone 800-367-5877
Performance Availability Website Address [Text] oef_PerformanceAvailabilityWebSiteAddress virtus.com
Performance Past Does Not Indicate Future [Text] oef_PerformancePastDoesNotIndicateFuture The Series’ past performance is not necessarily an indication of how the Series will perform in the future.
Bar Chart [Heading] oef_BarChartHeading Calendar year total returns for Class A Shares 
Bar Chart Closing [Text Block] oef_BarChartClosingTextBlock
        

Best Quarter:

2020, Q2:

33.70%

Worst Quarter:

2022, Q2:

-28.83%

Year to Date (3/31/2026):

-12.73%
Performance Table Heading oef_PerformanceTableHeading Average Annual Total Returns (for the periods ended 12/31/2025)
Index No Deduction for Fees, Expenses, or Taxes [Text] oef_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses or taxes)
Performance Table Closing [Text Block] oef_PerformanceTableClosingTextBlock

The FT Wilshire 5000 Index is a broad-based free-float market capitalization-weighted index that aims to capture 100% of the U.S. investable market capitalization. The index is calculated on a total return basis with dividends reinvested. The index is unmanaged and not available for direct investment.

The Russell 1000® Growth Index is a free float-adjusted market capitalization-weighted index of growth-oriented stocks of the 1,000 largest companies in the Russell universe, which comprises the 3,000 largest U.S. companies. Effective March 24, 2025, the index applies a capping methodology. Index constituents are capped quarterly so that no more than 22.5% of the index weight may be allocated to a single constituent, and the sum of the weights of all constituents representing more than 4.5% of the index should not exceed 45% of the total index weight. For periods prior to March 24, 2025, the index was uncapped. The index is calculated on a total-return basis with dividends reinvested. The index is unmanaged and not available for direct investment.
Virtus KAR Capital Growth Series | Principal Risks  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

Principal Risks

The Series may not achieve its objective(s), and it is not intended to be a complete investment program. The value of the Series’ investments that supports your share value may decrease. If between the time you purchase shares and the time you sell shares the value of the Series’ investments decreases, you will lose money. Investment values can decrease for a number of reasons. Conditions affecting the overall economy, specific industries or companies in which the Series invests can be worse than expected, and investments may fail to perform as the subadviser expects. As a result, the value of your shares may decrease. Purchase and redemption activities by separate accounts of participating insurance companies may impact the management of the Series and its ability to achieve its investment objective(s). The principal risks of investing in the Series are identified below.
Virtus KAR Capital Growth Series | Risk Lose Money [Member]  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock If between the time you purchase shares and the time you sell shares the value of the Series’ investments decreases, you will lose money.
Virtus KAR Capital Growth Series | Equity Securities Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

> Equity Securities Risk: The value of the stocks held by the Series may be negatively affected by the financial market, industries in which the Series invests, or issuer-specific events. Focus on a particular style or in small or medium-sized companies may enhance that risk.
Virtus KAR Capital Growth Series | Sector Focused Investing Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

> Sector Focused Investing Risk: Events negatively affecting a particular market sector in which the Series focuses its investments may cause the value of the Series’ shares to decrease, perhaps significantly.
Virtus KAR Capital Growth Series | Focused Investment Risk (Technology-Related Risk)  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

> Focused Investment Risk (Technology-Related Risk): To the extent the Series focuses its investments on a limited number of issuers, sectors, industries or geographic regions, it may be subject to increased risk and volatility. Risks affecting companies in the technology sector include competition from new and existing companies, limited operating histories and management experience, patent and other intellectual property considerations and the commercial non-viability or rapid obsolescence of equipment, products or services.
Virtus KAR Capital Growth Series | Market Volatility Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

> Market Volatility Risk: The value of the securities in the Series may go up or down in response to the prospects of individual companies and/or general economic conditions. Price changes may be short- or long-term. Local, regional or global events such as war or military conflict (e.g., Russia’s invasion of Ukraine), geopolitical risk, acts of terrorism, the spread of infectious illness or other public health issue, recessions, tariffs and other restrictions on trade, or the threat or potential of one or more such events and developments, could have a significant impact on the Series and its investments, including hampering the ability of the Series’ portfolio manager(s) to invest the Series’ assets as intended.
Virtus KAR Capital Growth Series | Depositary Receipts Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

> Depositary Receipts Risk: Investments in foreign companies through depositary receipts may expose the Series to the same risks as direct investments in securities of foreign issuers.
Virtus KAR Capital Growth Series | Foreign Investing Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

> Foreign Investing Risk: Investing in foreign securities subjects the Series to additional risks such as increased volatility; currency fluctuations; less liquidity; less publicly available information about the foreign investment; and political, regulatory, economic, and market risk.
Virtus KAR Capital Growth Series | Growth Stocks Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

> Growth Stocks Risk: The Series’ investments in growth stocks may be more volatile than investments in other types of stocks, or may perform differently from the market as a whole and from other types of stocks.
Virtus KAR Capital Growth Series | Large Market Capitalization Companies Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

> Large Market Capitalization Companies Risk: The value of investments in larger companies may not rise as much as smaller companies, or larger companies may be unable to respond quickly to competitive challenges, such as changes in technology and consumer tastes.
Virtus KAR Capital Growth Series | Limited Number of Investments Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

> Limited Number of Investments Risk: Because the Series may have a limited number of securities, it may be more susceptible to factors adversely affecting its securities than a Series with a greater number of securities.
Virtus KAR Capital Growth Series | Redemption Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

> Redemption Risk: One or more large shareholders or groups of shareholders may redeem their holdings in the Series, resulting in an adverse impact on remaining shareholders in the Series by causing the Series to take actions it would not otherwise have taken. The effects of taxable gains resulting from large redemptions of Series shares would particularly impact non-redeeming shareholders who do not hold their Series shares in a tax-advantaged or tax-exempt vehicle. Such large shareholder redemptions, which may occur rapidly or unexpectedly, may cause a Series to sell portfolio securities at times when it would not otherwise do so, which may negatively impact the Series’ NAV and liquidity. In addition, a large redemption could result in the Series’ current expenses being allocated over a smaller asset base, leading to an increase in the Series’ expense ratio.
Virtus KAR Capital Growth Series | Small and Medium Market Capitalization Companies Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

> Small and Medium Market Capitalization Companies Risk: The Series’ investments in small and medium market capitalization companies may increase the volatility and risk of loss to the Series, as compared with investments in larger, more established companies.
Virtus KAR Capital Growth Series | FT Wilshire 5000 Index  
Risk/Return: oef_RiskReturnAbstract  
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel FT Wilshire 5000 Index
Average Annual Return, Percent oef_AvgAnnlRtrPct 17.13%
Average Annual Return, Percent oef_AvgAnnlRtrPct 13.40%
Average Annual Return, Percent oef_AvgAnnlRtrPct 14.45%
Virtus KAR Capital Growth Series | Russell 1000® Growth Index  
Risk/Return: oef_RiskReturnAbstract  
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel Russell 1000® Growth Index
Average Annual Return, Percent oef_AvgAnnlRtrPct 18.56%
Average Annual Return, Percent oef_AvgAnnlRtrPct 15.32%
Average Annual Return, Percent oef_AvgAnnlRtrPct 18.13%
Virtus KAR Capital Growth Series | Class A Shares  
Risk/Return: oef_RiskReturnAbstract  
Shareholder Fee, Other oef_ShareholderFeeOther $ 0
Management Fees (as a percentage of Assets) oef_ManagementFeesOverAssets 0.70%
Distribution and Service (12b-1) Fees oef_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.15%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 1.10%
Fee Waiver or Reimbursement oef_FeeWaiverOrReimbursementOverAssets (0.07%) [1]
Net Expenses (as a percentage of Assets) oef_NetExpensesOverAssets 1.03% [1]
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 105
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 343
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 599
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 $ 1,334
Year to Date Return, Label [Optional Text] oef_YearToDateReturnLabel Year to Date
Bar Chart, Year to Date Return, Date oef_BarChartYearToDateReturnDate Mar. 31, 2026
Bar Chart, Year to Date Return oef_BarChartYearToDateReturn (12.73%)
Highest Quarterly Return, Label [Optional Text] oef_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date oef_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return oef_BarChartHighestQuarterlyReturn 33.70%
Lowest Quarterly Return, Label [Optional Text] oef_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date oef_BarChartLowestQuarterlyReturnDate Jun. 30, 2022
Lowest Quarterly Return oef_BarChartLowestQuarterlyReturn (28.83%)
Average Annual Return, Percent oef_AvgAnnlRtrPct 6.96%
Average Annual Return, Percent oef_AvgAnnlRtrPct 5.43%
Average Annual Return, Percent oef_AvgAnnlRtrPct 13.10%
Annual Return [Percent] oef_AnnlRtrPct (0.86%)
Annual Return [Percent] oef_AnnlRtrPct 36.07%
Annual Return [Percent] oef_AnnlRtrPct (7.25%)
Annual Return [Percent] oef_AnnlRtrPct 39.87%
Annual Return [Percent] oef_AnnlRtrPct 50.23%
Annual Return [Percent] oef_AnnlRtrPct 12.13706%
Annual Return [Percent] oef_AnnlRtrPct (36.1095%)
Annual Return [Percent] oef_AnnlRtrPct 34.70596%
Annual Return [Percent] oef_AnnlRtrPct 26.19905%
Annual Return [Percent] oef_AnnlRtrPct 6.96%
[1]

The Series’ investment adviser has contractually agreed to limit the Series’ total annual operating expenses (excluding certain expenses, such as front-end 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 1.03% through April 30, 2027. Prior to April 30, 2027, only the Series' Board may modify or terminate the expense limitation agreement. Following the contractual period, the adviser may discontinue these expense reimbursement arrangements at any time. The 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, and any in effect at the time of recapture, after repayment is taken into account.