This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund, but does not reflect the effect of any fees or other expenses of any variable annuity or variable life insurance product. If variable annuity or variable life contract fees were included, expenses would be higher:

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Fund 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

April 29, 2023

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover.

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, such as brokerage 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 fund operating expenses or in the example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 132% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

132.00%

Expense Example [Heading]

rr_ExpenseExampleHeading

Example.

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example does not include expenses incurred from investing through a variable annuity or a variable life insurance product. If the example included these expenses, the figures shown would be higher.

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

The example assumes that you invest $10,000 in the Fund 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 Fund's operating expenses remain the same and that all fee waivers or expense limits for the Fund will expire after one year. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Strategy [Heading]

rr_StrategyHeading

The Fund’s Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

The Fund seeks to achieve its investment goal by investing primarily in a diversified portfolio of fixed-income and equity securities. The following table details, under normal circumstances, how the Fund generally expects to allocate its assets among equity and fixed-income, as of the date of this prospectus.

Allocations Approximate Target Allocation

Equity 60%

Fixed-Income 40%

With respect to equities, the Fund invests primarily in issuers having a market capitalization, at the time of purchase, above $5 billion. Equity securities include common stock and preferred stock. These securities may be listed on an exchange or traded over-the-counter. Up to 35% of the Fund’s equity sleeve may be invested in securities of foreign issuers through the use of ordinary shares or depositary receipts such as American Depositary Receipts (“ADRs”). The Fund may also invest in equity securities of emerging market countries. Emerging market countries are generally countries that are included in the Morgan Stanley Capital International (“MSCI”) Emerging Markets Index.

With respect to fixed-income, the Fund will invest primarily in bonds, including mortgage-related securities, asset-backed securities, government securities (both U.S. government securities and foreign sovereign debt), and corporate debt securities. Fort Washington Investment Advisors, Inc. ("Fort Washington"), the Fund's sub-advisor, primarily invests in investment-grade debt securities, but may invest up to 30% of the Fund's fixed-income sleeve in non-investment-grade debt securities rated as low as B by a Nationally Recognized Statistical Rating Organization (“NRSRO”). Non-investment-grade debt securities are often referred to as “junk bonds” and are considered speculative. The Fund's investment policies are based on credit ratings at the time of purchase.

The Fund may engage in frequent and active trading as part of its principal investment strategies. Additionally, in order to implement its investment strategy, the Fund may invest in mortgage dollar-roll transactions and in derivatives, including forwards, futures contracts, interest rate and credit default swap agreements, and options. Mortgage “dollar rolls” are transactions in which mortgage-backed securities are sold for delivery in the current month and the seller simultaneously contracts to repurchase substantially similar securities on a specified future date. These investments may be used to gain or hedge market exposure, to adjust the Fund’s duration, to manage interest rate risk, and for any other purposes consistent with the Fund’s investment strategies and limitations.

Fort Washington, subject to approval by the Fund’s Advisor, may change the Fund’s target allocation to each asset class (or to additional asset classes) without prior approval from or notice to shareholders.

Risk [Heading]

rr_RiskHeading

The Fund’s Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

The Fund’s share price will fluctuate. You could lose money on your investment in the Fund and the Fund could also return less than other investments. Investments in the Fund are not bank guaranteed, are not deposits, and are not insured by the Federal Deposit Insurance Corporation (the "FDIC") or any other federal government agency. As with any mutual fund, there is no guarantee that the Fund will achieve its investment goal. You can find more information about the Fund’s investments and risks under the “Principal Investment Strategies and Risks” section of the Fund’s prospectus. The Fund is subject to the principal risks summarized below.

Equity Securities Risk: The Fund is subject to the risk that stock prices will fall over short or extended periods of time. Individual companies may report poor results or be negatively affected by industry and/or economic trends and developments, or as a result of irregular and/or unexpected trading activity among retail investors. The prices of securities issued by these companies may decline in response to such developments, which could result in a decline in the value of the Fund’s shares.

•Large-Cap Risk: Large-cap companies may be unable to respond quickly to new competitive challenges, such as changes in technology and consumer tastes, and also may not be able to attain the high growth rate of successful smaller companies, especially during extended periods of economic expansion.

•Mid-Cap Risk: Stocks of mid-sized companies may be subject to more abrupt or erratic market movements than stocks of larger, more established companies. Mid-sized companies may have limited product lines or financial resources, and may be dependent upon a particular niche of the market.

•Preferred Stock Risk: In the event an issuer is liquidated or declares bankruptcy, the claims of owners of bonds take precedence over the claims of those who own preferred and common stock. If interest rates rise, the fixed dividend on preferred stocks may be less attractive, causing the price of preferred stocks to decline.

Fixed-Income Risk: The market value of the Fund’s fixed-income securities responds to economic developments, particularly interest rate changes, as well as to perceptions about the creditworthiness of individual issuers, including governments. Generally, the Fund’s fixed-income securities will decrease in value if interest rates rise and increase in value if interest rates fall. Normally, the longer the maturity or duration of the fixed-income securities the Fund owns, the more sensitive the value of the Fund’s shares will be to changes in interest rates.

•Asset-Backed Securities Risk: Asset-backed securities are fixed-income securities backed by other assets such as credit card, automobile or consumer loan receivables, retail installment loans, or participations in pools of leases. The values of these securities are sensitive to changes in the credit quality of the underlying collateral, the credit strength of any credit enhancement feature, changes in interest rates, and, at times, the financial condition of the issuer.

•Credit Risk: The fixed-income securities in the Fund’s portfolio are subject to the possibility that a deterioration, whether sudden or gradual, in the financial condition of an issuer, or a deterioration in general economic conditions, could cause an issuer to fail to make timely payments of principal or interest, when due. This may cause the issuer’s securities to decline in value.

•Interest Rate Risk: In general, when interest rates rise, the prices of debt securities fall, and when interest rates fall, the prices of debt securities rise. The price volatility of a debt security also depends on its maturity. Longer-term securities are generally more volatile, so the longer the average maturity or duration of these securities, the greater their price risk. Duration is a measure of the expected life, taking into account any prepayment or call features of the security, that is used to determine the price sensitivity of the security for a given change in interest rates. Maturity, on the other hand, is the date on which a fixed-income security becomes due for payment of principal. Recent and potential future changes in government policy may affect interest rates.

•Investment-Grade Debt Securities Risk: Investment-grade debt securities may be downgraded by a nationally recognized statistical rating organization ("NRSRO") to below-investment-grade status, which would increase the risk of holding these securities. Investment-grade debt securities rated in the lowest rating category by a NRSRO involve a higher degree of risk than fixed-income securities with higher credit ratings.

•Mortgage-Backed Securities Risk: Mortgage-backed securities are fixed-income securities representing an interest in a pool of underlying mortgage loans. Mortgage-backed securities are sensitive to changes in interest rates, but may respond to these changes differently from other fixed-income securities due to the possibility of prepayment of the underlying mortgage loans. Mortgage-backed securities may fluctuate in price based on deterioration in the value of the collateral underlying the pool of mortgage loans, which may result in the collateral being worth less than the remaining principal amount owed on the mortgages in the pool.

•Non-Investment-Grade Debt Securities Risk: Non-investment-grade debt securities are sometimes referred to as “junk bonds” and are considered speculative with respect to their issuers’ ability to make payments of interest and principal. There is a high risk that the Fund could suffer a loss from investments in non-investment-grade debt securities caused by the default of an issuer of such securities. Non-investment-grade debt securities may also be less liquid than investment-grade debt securities.

•Prepayment Risk: The risk that a debt security may be paid off and proceeds invested earlier than anticipated. Prepayment impacts both the interest rate sensitivity of the underlying asset, such as an asset-backed or mortgage-backed security and its cash flow projections. Therefore, prepayment risk may make it difficult to calculate the average duration of the Fund’s asset- or mortgage-backed securities which in turn would make it difficult to assess the interest rate risk of the Fund.

•Rating Agency Risk: Ratings represent a NRSRO opinion regarding the quality of the security and are not a guarantee of quality. NRSROs may fail to timely update credit ratings in response to subsequent events. In addition, NRSROs are subject to an inherent conflict of interest because they are often compensated by the same issuers whose securities they grade.

•U.S. Government Securities Risk: Certain U.S. government securities are backed by the right of the issuer to borrow from the U.S. Treasury while others are supported only by the credit of the issuer or instrumentality. While the U.S. government is able to provide financial support to U.S. government-sponsored agencies or instrumentalities, no assurance can be given that it will always do so. Such securities are generally neither issued nor guaranteed by the U.S. Treasury.

Economic and Market Events Risk: Events in the U.S. and global financial markets, including actions taken by the U.S. Federal Reserve or foreign central banks to stimulate or stabilize economic growth, may at times, and for varying periods of time, result in unusually high market volatility, which could negatively impact the Fund’s performance and cause the Fund to experience illiquidity, shareholder redemptions, or other potentially adverse effects. Reduced liquidity in credit and fixed-income markets could negatively affect issuers worldwide. Financial institutions could suffer losses as interest rates rise or economic conditions deteriorate. In addition, the Fund's service providers are susceptible to operational and information or cyber security risks that could result in losses to the Fund and its shareholders. Cyber security breaches are either intentional or unintentional events that allow an unauthorized party to gain access to Fund assets, customer data, or proprietary information, or cause the Fund or Fund service provider to suffer data corruption or lose operational functionality. A cyber security breach could result in the loss or theft of customer data or funds, loss or theft of proprietary information or corporate data, physical damage to a computer or network system, or costs associated with system repairs, any of which could have a substantial impact on the Fund. Such incidents could affect issuers in which the Fund invests, thereby causing the Fund’s investments to lose value.

Management Risk: In managing the Fund’s portfolio, the Advisor engages one or more sub-advisors to make investment decisions for a portion of or the entire portfolio. There is a risk that the Advisor may be unable to identify and retain sub-advisors who achieve superior investment returns relative to other similar sub-advisors.

Derivatives Risk: The use of derivatives may expose the Fund to additional risks that it would not be subject to if it invested directly in the securities underlying those derivatives. Risks associated with derivatives may include the risk that the derivative does not correlate well with the security, index, or currency to which it relates, the risk that the Fund will be unable to sell or close out the derivative due to an illiquid market, the risk that the counterparty may be unwilling or unable to meet its obligations, and the risk that the derivative could expose the Fund to the risk of magnified losses resulting from leverage. These additional risks could cause the Fund to experience losses to which it would otherwise not be subject.

•Leverage Risk: Leverage occurs when the Fund uses borrowings, derivatives (such as futures or options), or similar instruments or techniques to gain exposure to investments in an amount that exceeds the Fund's initial investment. The use of leverage magnifies changes in the Fund's net asset value and thus may result in increased portfolio volatility and increased risk of loss. Leverage can create an interest expense that may lower the Fund’s overall returns. There can be no guarantee that a leveraging strategy will be successful.

•Forward Foreign Currency Exchange Contract Risk: A forward foreign currency exchange contract is an agreement to buy or sell a specific currency at a future date and at a price set at the time of the contract. Forward foreign currency exchange contracts may reduce the risk of loss from a change in value of a currency, but they also limit any potential gains and do not protect against fluctuations in the value of the underlying position.

•Futures Contracts Risk: The risks associated with the Fund’s futures positions include liquidity and counterparty risks associated with derivative instruments.

•Options Risk: Options trading is a highly specialized activity that involves investment techniques and risks different from those associated with ordinary portfolio securities transactions. The value of options can be highly volatile, and their use can result in loss if the sub-advisor is incorrect in its expectation of price fluctuations. Options, whether exchange traded or over-the-counter, may also be illiquid.

•Swap Agreements Risk: Swap agreements (“swaps”) are individually negotiated and structured to include exposure to a variety of different types of investments or market factors. Swaps may increase or decrease the overall volatility of the investments of the Fund and its share price. The performance of swaps may be affected by a change in the specific interest rate, currency, or other factors that determine the amounts of payments due to and from the Fund. A swap can be a form of leverage, which can magnify the Fund’s gains or losses.

Foreign Securities Risk: Investing in foreign securities poses additional risks since political and economic events unique in a country or region will affect those markets and their issuers, while such events may not necessarily affect the U.S. economy or issuers located in the United States. In addition, investments in foreign securities are generally denominated in foreign currency. As a result, changes in the value of those currencies compared to the U.S. dollar may affect (positively or negatively) the value of the Fund's investments. There are also risks associated with foreign accounting standards, government regulation, market information, and clearance and settlement procedures. Foreign markets may be less liquid and more volatile than U.S. markets and offer less protection to investors.

•Depositary Receipts Risk: Foreign receipts, which include ADRs, GDRs, and European Depositary Receipts, are securities that evidence ownership interests in a security or a pool of securities issued by a foreign issuer. The risks of depositary receipts include many risks associated with investing directly in foreign securities.

•Emerging Markets Risk: Emerging markets may be more likely to experience political turmoil or rapid changes in market or economic conditions than more developed countries. In addition, the financial stability of issuers (including governments) in emerging market countries may be more precarious than that of issuers in other countries.

•Sovereign Debt Risk: The actions of foreign governments concerning their respective economies could have an important effect on their ability or willingness to service their sovereign debt. Such actions could have significant effects on market conditions and on the prices of securities and instruments held by the Fund, including the securities and instruments of foreign private issuers.

Mortgage Dollar Roll Risk: Mortgage “dollar rolls” are transactions in which mortgage-backed securities are sold for delivery in the current month and the seller simultaneously contracts to repurchase substantially similar securities on a specified future date. If the broker-dealer to whom the Fund sells the security becomes insolvent, the Fund’s right to repurchase the security may be restricted. Other risks involved in entering into mortgage dollar rolls include the risk that the value of the security may change adversely over the term of the mortgage dollar roll and that the security the Fund is required to repurchase may be worth less than the security that the Fund held.

Portfolio Turnover Risk: Frequent and active trading may result in greater expenses to the Fund, which may lower the Fund's performance and may result in the realization of substantial capital gains, including net short–term capital gains, although owners of variable annuity contracts or variable life policies are not expected to be subject to federal income tax on distributions of capital gains by the Fund. High portfolio turnover may reduce the Fund's returns.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money on your investment in the Fund and the Fund could also return less than other investments.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

Investments in the Fund are not bank guaranteed, are not deposits, and are not insured by the Federal Deposit Insurance Corporation (the "FDIC") or any other federal government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

The Fund’s Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

On October 27, 2017, the Sentinel Variable Products Balanced Fund, previously a series of Sentinel Variable Products Trust (the "Predecessor Fund"), was reorganized into Class I shares of the Fund. As a result of the reorganization, the performance and accounting history of the Predecessor Fund was assumed by the Fund. Financial and performance information prior to October 27, 2017 is that of the Predecessor Fund.

The bar chart and the performance table below illustrate some indication of the risks and volatility of an investment in the Fund by showing changes in the Fund’s Class I share performance from calendar year to calendar year and by showing how the Fund’s Class I share average annual total returns for one year, five years, and ten years compare with a blended benchmark comprised of 60% S&P 500® Index and 40% Bloomberg U.S. Aggregate Bond Index.

The performance information shown does not reflect fees that are paid by the separate accounts through which shares of the Fund are sold. Inclusion of those fees would reduce the total return figures for all periods. Past performance does not necessarily indicate how the Fund will perform in the future. More recent performance information is available at no cost by visiting TouchstoneInvestments.com or by calling 1.800.543.0407.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

1.800.543.0407

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

TouchstoneInvestments.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance does not necessarily indicate how the Fund will perform in the future.

Bar Chart [Heading]

rr_BarChartHeading

Touchstone Balanced Fund - Class I Shares Performance as of December 31

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock


Best Quarter: Second Quarter 2020 14.50%						Worst Quarter: First Quarter 2020 (11.72)%

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns For the periods ended December 31, 2021

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

After-tax returns are not relevant to investors who hold their Fund shares through tax-deferred arrangements.

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

Class SC shares of the Fund commenced operations on April 13, 2021 and do not have a full calendar year of performance history. Class SC shares would have had substantially similar annual returns to Class I shares because the shares are invested in the same portfolio of securities and the annual returns differ only to the extent that the share classes do not have the same expenses.

Performance Table Closing [Text Block]

rr_PerformanceTableClosingTextBlock

The Fund returns shown in the table above are before taxes. After-tax returns are not relevant to investors who hold their Fund shares through tax-deferred arrangements. Please see the "Distribution and Taxes" section of the Fund's prospectus for more information.

TOUCHSTONE VARIABLE SERIES TRUST | Touchstone Balanced Fund | Blend: 60% S&P 500® Index & 40% Bloomberg U.S. Aggregate Bond Index

Prospectus [Line Items]

rr_ProspectusLineItems

Index No Deduction for Fees, Expenses, Taxes [Text]

rr_IndexNoDeductionForFeesExpensesTaxes

(reflects no deductions for fees, expenses or taxes)

Label

rr_AverageAnnualReturnLabel

Blend: 60% S&P 500® Index & 40% Bloomberg U.S. Aggregate Bond Index (reflects no deductions for fees, expenses or taxes)

1 Year

rr_AverageAnnualReturnYear01

15.86%

5 Years

rr_AverageAnnualReturnYear05

12.62%

10 Years

rr_AverageAnnualReturnYear10

11.14%

TOUCHSTONE VARIABLE SERIES TRUST | Touchstone Balanced Fund | Touchstone Balanced Fund - Class I

Prospectus [Line Items]

rr_ProspectusLineItems

Management Fees (as a percentage of Assets)

rr_ManagementFeesOverAssets

0.55%

Shareholder Service Fees

rr_Component1OtherExpensesOverAssets

none

Other Operating Expenses

rr_Component2OtherExpensesOverAssets

0.50%

Other Expenses (as a percentage of Assets):

rr_OtherExpensesOverAssets

0.50%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

Expenses (as a percentage of Assets)

rr_ExpensesOverAssets

1.06%

^[1]

Fee Waiver or Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.26%)

^[2]

Net Expenses (as a percentage of Assets)

rr_NetExpensesOverAssets

0.80%

^[1],[2],[3]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 82

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

311

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

560

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

$ 1,271

Annual Return 2012

rr_AnnualReturn2012

11.44%

Annual Return 2013

rr_AnnualReturn2013

18.88%

Annual Return 2014

rr_AnnualReturn2014

7.81%

Annual Return 2015

rr_AnnualReturn2015

0.03%

Annual Return 2016

rr_AnnualReturn2016

7.42%

Annual Return 2017

rr_AnnualReturn2017

14.06%

Annual Return 2018

rr_AnnualReturn2018

(6.07%)

Annual Return 2019

rr_AnnualReturn2019

22.80%

Annual Return 2020

rr_AnnualReturn2020

19.16%

Annual Return 2021

rr_AnnualReturn2021

17.07%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Best Quarter:

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2020

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

14.50%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Worst Quarter:

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Mar. 31, 2020

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(11.72%)

Label

rr_AverageAnnualReturnLabel

Balanced Fund - Class I *

^[4]

1 Year

rr_AverageAnnualReturnYear01

17.07%

^[4]

5 Years

rr_AverageAnnualReturnYear05

12.91%

^[4]

10 Years

rr_AverageAnnualReturnYear10

10.91%

^[4]

TOUCHSTONE VARIABLE SERIES TRUST | Touchstone Balanced Fund | Class SC

Prospectus [Line Items]

rr_ProspectusLineItems

Management Fees (as a percentage of Assets)

rr_ManagementFeesOverAssets

0.55%

Shareholder Service Fees

rr_Component1OtherExpensesOverAssets

0.25%

Other Operating Expenses

rr_Component2OtherExpensesOverAssets

0.33%

Other Expenses (as a percentage of Assets):

rr_OtherExpensesOverAssets

0.58%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

Expenses (as a percentage of Assets)

rr_ExpensesOverAssets

1.14%

^[1]

Fee Waiver or Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.34%)

^[2]

Net Expenses (as a percentage of Assets)

rr_NetExpensesOverAssets

0.80%

^[1],[2]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 82

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

329

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

595

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

$ 1,356

Performance One Year or Less [Text]

rr_PerformanceOneYearOrLess

Class SC shares of the Fund commenced operations on April 13, 2021 and do not have a full calendar year of performance history.

TOUCHSTONE VARIABLE SERIES TRUST | Touchstone Bond Fund

Prospectus [Line Items]

rr_ProspectusLineItems

Risk/Return [Heading]

rr_RiskReturnHeading

Touchstone Bond Fund

Objective [Heading]

rr_ObjectiveHeading

The Fund’s Investment Goal

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The Touchstone Bond Fund (the "Fund") seeks to provide as high a level of current income as is consistent with the preservation of capital.

Objective, Secondary [Text Block]

rr_ObjectiveSecondaryTextBlock

Capital appreciation is a secondary goal.

Expense [Heading]

rr_ExpenseHeading

The Fund’s Fees and Expenses

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Fund 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

April 29, 2023

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover.

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

142.00%

Expense Example [Heading]

rr_ExpenseExampleHeading

Example.

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Strategy [Heading]

rr_StrategyHeading

The Fund’s Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

Under normal conditions, the Fund invests at least 80% of its assets (including borrowing for investment purposes) in bonds. This is a non-fundamental investment policy that the Fund can change upon 60 days prior notice to shareholders. Bonds include mortgage-related securities, asset-backed securities, government securities (both U.S. government securities and foreign sovereign debt), and corporate debt securities. The Fund may engage in frequent and active trading as part of its principal investment strategy.

In deciding which securities to buy and sell for the Fund, the Fund's sub-advisor, Fort Washington Investment Advisors, Inc. ("Fort Washington"), analyzes the overall investment opportunities and risks in different sectors of the debt securities markets by focusing on maximizing total return while reducing volatility of the Fund's portfolio.

In building the Fund's portfolio, Fort Washington primarily invests in investment-grade debt securities, but may invest up to 30% of its total assets in non-investment-grade debt securities rated as low as B by a Nationally Recognized Statistical Rating Organization ("NRSRO"). Non-investment-grade debt securities are often referred to as "junk bonds" and are considered speculative. The Fund's investment policies are based on credit ratings at the time of purchase. The Fund may also invest up to 20% of its total assets in foreign-issued debt denominated in either the U.S. dollar or a foreign currency. Foreign-issued debt may include debt securities of emerging market countries.

Additionally, in order to implement its investment strategy, the Fund may invest in collateralized loan obligations, mortgage dollar-roll transactions and reverse repurchase agreements, and in derivatives including forwards and futures contracts, interest rate and credit default swap agreements, and options. Mortgage “dollar rolls” are transactions in which mortgage-backed securities are sold for delivery in the current month and the seller simultaneously contracts to repurchase substantially similar securities on a specified future date. These investments may be used for both gaining and hedging market exposure, to adjust the Fund's duration, to manage interest rate risk, and for any other purposes consistent with its investment strategies and limitations.

Risk [Heading]

rr_RiskHeading

The Fund’s Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

The Fund’s share price will fluctuate. You could lose money on your investment in the Fund and the Fund could also return less than other investments. Investments in the Fund are not bank guaranteed, are not deposits, and are not insured by the FDIC or any other federal government agency. As with any mutual fund, there is no guarantee that the Fund will achieve its investment goal. You can find more information about the Fund’s investments and risks under the “Principal Investment Strategies and Risks” section of the Fund’s prospectus. The Fund is subject to the principal risks summarized below.

Collateralized Loan Obligations Risk: Typically, collateralized loan obligations are privately offered and sold, and thus are not registered under the securities laws. As a result, the Fund may in certain circumstances characterize its investments in collateralized loan obligations as illiquid. Collateralized loan obligations are subject to the typical risks associated with debt instruments (i.e., interest rate risk and credit risk). Additional risks of collateralized loan obligations include the possibility that distributions from collateral securities will be insufficient to make interest or other payments, the potential for a decline in the quality of the collateral, and the possibility that the Fund may invest in a subordinate tranche of a collateralized loan obligation.

•Futures Contracts Risk: The risks associated with the Fund’s futures positions include liquidity and counterparty risks associated with derivative instruments.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money on your investment in the Fund and the Fund could also return less than other investments.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

Investments in the Fund are not bank guaranteed, are not deposits, and are not insured by the FDIC or any other federal government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

The Fund’s Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

On October 27, 2017, the Sentinel Variable Products Bond Fund, previously a series of Sentinel Variable Products Trust (the "Predecessor Fund"), was reorganized into Class I shares of the Fund. As a result of the reorganization, the performance history of the Predecessor Fund was assumed by the Fund. Performance information prior to October 27, 2017 is that of the Predecessor Fund.

performance does not necessarily indicate how the Fund will perform in the future. More recent performance information is available at no cost by visiting TouchstoneInvestments.com or by calling 1.800.543.0407.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

1.800.543.0407

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

TouchstoneInvestments.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance does not necessarily indicate how the Fund will perform in the future.

Bar Chart [Heading]

rr_BarChartHeading

Touchstone Bond Fund - Class I Shares Performance as of December 31

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock


Best Quarter: Second Quarter 2020 7.34%						Worst Quarter: First Quarter 2021 (3.24)%

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns For the periods ended December 31, 2021

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

After-tax returns are not relevant to investors who hold their Fund shares through tax-deferred arrangements.

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

Class SC shares of the Fund commenced operations on July 10, 2019. Performance shown prior to the commencement date of Class SC shares is that of Class I shares or the Predecessor Fund, as applicable. Class SC shares would have had substantially similar annual returns to Class I shares because the shares are invested in the same portfolio of securities and the annual returns differ only to the extent that the share classes do not have the same expenses.

Performance Table Closing [Text Block]

rr_PerformanceTableClosingTextBlock

TOUCHSTONE VARIABLE SERIES TRUST | Touchstone Bond Fund | Bloomberg U.S. Aggregate Bond Index

Prospectus [Line Items]

rr_ProspectusLineItems

Index No Deduction for Fees, Expenses, Taxes [Text]

rr_IndexNoDeductionForFeesExpensesTaxes

(reflects no deductions for fees, expenses or taxes)

Label

rr_AverageAnnualReturnLabel

Bloomberg U.S. Aggregate Bond Index (reflects no deductions for fees, expenses or taxes)

1 Year

rr_AverageAnnualReturnYear01

(1.54%)

5 Years

rr_AverageAnnualReturnYear05

3.57%

10 Years

rr_AverageAnnualReturnYear10

2.90%

TOUCHSTONE VARIABLE SERIES TRUST | Touchstone Bond Fund | Touchstone Bond Fund - Class I

Prospectus [Line Items]

rr_ProspectusLineItems

Management Fees (as a percentage of Assets)

rr_ManagementFeesOverAssets

0.40%

Shareholder Service Fees

rr_Component1OtherExpensesOverAssets

none

Other Operating Expenses

rr_Component2OtherExpensesOverAssets

0.37%

Other Expenses (as a percentage of Assets):

rr_OtherExpensesOverAssets

0.37%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.02%

Expenses (as a percentage of Assets)

rr_ExpensesOverAssets

0.79%

^[5]

Fee Waiver or Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.10%)

^[6]

Net Expenses (as a percentage of Assets)

rr_NetExpensesOverAssets

0.69%

^[5],[6]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 70

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

242

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

429

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

$ 969

Annual Return 2012

rr_AnnualReturn2012

6.53%

Annual Return 2013

rr_AnnualReturn2013

(0.33%)

Annual Return 2014

rr_AnnualReturn2014

4.01%

Annual Return 2015

rr_AnnualReturn2015

(1.29%)

Annual Return 2016

rr_AnnualReturn2016

0.81%

Annual Return 2017

rr_AnnualReturn2017

3.67%

Annual Return 2018

rr_AnnualReturn2018

(1.88%)

Annual Return 2019

rr_AnnualReturn2019

10.46%

Annual Return 2020

rr_AnnualReturn2020

9.71%

Annual Return 2021

rr_AnnualReturn2021

(1.21%)

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Best Quarter:

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2020

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

7.34%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Worst Quarter:

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Mar. 31, 2021

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(3.24%)

Label

rr_AverageAnnualReturnLabel

Bond Fund - Class I

1 Year

rr_AverageAnnualReturnYear01

(1.21%)

5 Years

rr_AverageAnnualReturnYear05

4.02%

10 Years

rr_AverageAnnualReturnYear10

2.96%

TOUCHSTONE VARIABLE SERIES TRUST | Touchstone Bond Fund | Class SC

Prospectus [Line Items]

rr_ProspectusLineItems

Management Fees (as a percentage of Assets)

rr_ManagementFeesOverAssets

0.40%

Shareholder Service Fees

rr_Component1OtherExpensesOverAssets

0.07%

Other Operating Expenses

rr_Component2OtherExpensesOverAssets

0.32%

Other Expenses (as a percentage of Assets):

rr_OtherExpensesOverAssets

0.39%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.02%

Expenses (as a percentage of Assets)

rr_ExpensesOverAssets

0.81%

^[5]

Fee Waiver or Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

none

^[6]

Net Expenses (as a percentage of Assets)

rr_NetExpensesOverAssets

0.81%

^[5],[6]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 83

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

259

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

450

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

$ 1,002

Label

rr_AverageAnnualReturnLabel

Bond Fund - Class SC

1 Year

rr_AverageAnnualReturnYear01

(1.30%)

5 Years

rr_AverageAnnualReturnYear05

3.81%

10 Years

rr_AverageAnnualReturnYear10

2.70%

TOUCHSTONE VARIABLE SERIES TRUST | Touchstone Common Stock Fund

Prospectus [Line Items]

rr_ProspectusLineItems

Risk/Return [Heading]

rr_RiskReturnHeading

Touchstone Common Stock Fund

Objective [Heading]

rr_ObjectiveHeading

The Fund’s Investment Goal

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The Touchstone Common Stock Fund (the “Fund”) seeks to provide investors with capital appreciation.

Expense [Heading]

rr_ExpenseHeading

The Fund’s Fees and Expenses

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Fund 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

April 29, 2023

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover.

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

6.00%

Expense Example [Heading]

rr_ExpenseExampleHeading

Example.

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Strategy [Heading]

rr_StrategyHeading

The Fund’s Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

The Fund invests, under normal market conditions, at least 80% of its assets in large capitalization equity securities. The Fund invests primarily in issuers having a market capitalization, at the time of purchase, above $5 billion. The Fund’s 80% policy is a non-fundamental investment policy that can be changed by the Fund upon 60 days’ prior notice to shareholders. Equity securities include common stock and preferred stock. These securities may be listed on an exchange or traded over-the-counter.

In selecting securities for the Fund, the Fund’s sub-advisor, Fort Washington Investment Advisors, Inc. (“Fort Washington”), seeks to invest in companies that:

•Are trading below its estimate of the companies’ intrinsic value; and

•Have a sustainable competitive advantage or a high barrier to entry in place. The barrier(s) to entry can be created through a cost advantage, economies of scale, high customer loyalty, or a government barrier (e.g., license or subsidy). Fort Washington believes that the strongest barrier to entry is the combination of economies of scale and higher customer loyalty.

The Fund will generally hold 25 to 45 companies, with residual cash and equivalents expected to represent less than 10% of the Fund’s net assets. The Fund may, at times, hold fewer securities and a higher percentage of cash and equivalents when, among other reasons, Fort Washington cannot find a sufficient number of securities that meets its purchase requirements. Although the Fund may invest in any economic sector, at times it may emphasize one or more particular sectors.

The Fund may invest up to 35% of its assets in securities of foreign issuers through the use of ordinary shares or depositary receipts such as American Depositary Receipts (“ADRs”). The Fund may also invest in securities of emerging market countries. Emerging market countries are generally countries that are included in the Morgan Stanley Capital International (“MSCI”) Emerging Markets Index.

The Fund will generally sell a security if it reaches Fort Washington’s estimate of fair value, if a more attractive investment opportunity is available, or if a structural change has taken place and Fort Washington cannot reliably estimate the impact of the change on the business fundamentals.

The Fund is non-diversified and, therefore may, from time to time, have significant exposure to a limited number of issuers.

Risk [Heading]

rr_RiskHeading

The Fund’s Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

The Fund’s share price will fluctuate. You could lose money on your investment in the Fund and the Fund could also return less than other investments. Investments in the Fund are not bank guaranteed, are not deposits, and are not insured by the FDIC or any other federal government agency. As with any mutual fund, there is no guarantee that the Fund will achieve its investment goal. You can find more information about the Fund’s investments and risks under the “Principal Investment Strategies and Risks” section of the Fund’s prospectus. The Fund is subject to the principal risks summarized below.

securities issued by these companies may decline in response to such developments, which could result in a decline in the value of the Fund’s shares.

Non-Diversification Risk: The Fund is non-diversified, which means that it may invest a greater percentage of its assets than a diversified mutual fund in the securities of a limited number of issuers. The use of a non-diversified investment strategy may increase the volatility of the Fund’s investment performance, as the Fund may be more susceptible to risks associated with a single economic, political or regulatory event.

Sector Focus Risk: A fund that focuses its investments in the securities of a particular market sector is subject to the risk that adverse circumstances will have a greater impact on the fund than a fund that does not focus its investments in a particular sector.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money on your investment in the Fund and the Fund could also return less than other investments.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

The Fund is non-diversified, which means that it may invest a greater percentage of its assets than a diversified mutual fund in the securities of a limited number of issuers. The use of a non-diversified investment strategy may increase the volatility of the Fund’s investment performance, as the Fund may be more susceptible to risks associated with a single economic, political or regulatory event.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

Investments in the Fund are not bank guaranteed, are not deposits, and are not insured by the FDIC or any other federal government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

The Fund’s Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

On October 27, 2017, the Sentinel Variable Products Common Stock Fund, previously a series of Sentinel Variable Products Trust (the "Predecessor Fund"), was reorganized into Class I shares of the Fund. As a result of the reorganization, the performance history of the Predecessor Fund was assumed by the Fund. Performance information prior to October 27, 2017 is that of the Predecessor Fund.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

1.800.543.0407

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

TouchstoneInvestments.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance does not necessarily indicate how the Fund will perform in the future.

Bar Chart [Heading]

rr_BarChartHeading

Touchstone Common Stock Fund - Class I Shares Performance as of December 31

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock


Best Quarter: Second Quarter 2020 20.13%						Worst Quarter: First Quarter 2020 (19.11)%

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total ReturnsFor the Periods Ended December 31, 2021

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

After-tax returns are not relevant to investors who holdtheir Fund shares through tax-deferred arrangements.

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

Performance Table Closing [Text Block]

rr_PerformanceTableClosingTextBlock

The Fund returns shown in the table above are before taxes. After-tax returns are not relevant to investors who hold

their Fund shares through tax-deferred arrangements. Please see the "Distribution and Taxes" section of the Fund's prospectus for more information.

TOUCHSTONE VARIABLE SERIES TRUST | Touchstone Common Stock Fund | S&P 500® Index

Prospectus [Line Items]

rr_ProspectusLineItems

Index No Deduction for Fees, Expenses, Taxes [Text]

rr_IndexNoDeductionForFeesExpensesTaxes

(reflects no deductions for fees, expenses or taxes)

Label

rr_AverageAnnualReturnLabel

S&P 500® Index (reflects no deductions for fees, expenses or taxes)

1 Year

rr_AverageAnnualReturnYear01

28.71%

5 Years

rr_AverageAnnualReturnYear05

18.47%

10 Years

rr_AverageAnnualReturnYear10

16.55%

TOUCHSTONE VARIABLE SERIES TRUST | Touchstone Common Stock Fund | Touchstone Common Stock Fund - Class I

Prospectus [Line Items]

rr_ProspectusLineItems

Management Fees (as a percentage of Assets)

rr_ManagementFeesOverAssets

0.49%

Shareholder Service Fees

rr_Component1OtherExpensesOverAssets

none

Other Operating Expenses

rr_Component2OtherExpensesOverAssets

0.27%

Other Expenses (as a percentage of Assets):

rr_OtherExpensesOverAssets

0.27%

Expenses (as a percentage of Assets)

rr_ExpensesOverAssets

0.76%

Fee Waiver or Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.03%)

^[7]

Net Expenses (as a percentage of Assets)

rr_NetExpensesOverAssets

0.73%

^[7]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 75

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

240

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

419

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

$ 939

Annual Return 2012

rr_AnnualReturn2012

15.10%

Annual Return 2013

rr_AnnualReturn2013

31.73%

Annual Return 2014

rr_AnnualReturn2014

10.34%

Annual Return 2015

rr_AnnualReturn2015

0.19%

Annual Return 2016

rr_AnnualReturn2016

11.26%

Annual Return 2017

rr_AnnualReturn2017

21.50%

Annual Return 2018

rr_AnnualReturn2018

(8.05%)

Annual Return 2019

rr_AnnualReturn2019

28.58%

Annual Return 2020

rr_AnnualReturn2020

23.68%

Annual Return 2021

rr_AnnualReturn2021

27.85%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Best Quarter:

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2020

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

20.13%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Worst Quarter:

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Mar. 31, 2020

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(19.11%)

Label

rr_AverageAnnualReturnLabel

Common Stock Fund - Class I

1 Year

rr_AverageAnnualReturnYear01

27.85%

5 Years

rr_AverageAnnualReturnYear05

17.83%

10 Years

rr_AverageAnnualReturnYear10

15.53%

TOUCHSTONE VARIABLE SERIES TRUST | Touchstone Common Stock Fund | Class SC

Prospectus [Line Items]

rr_ProspectusLineItems

Management Fees (as a percentage of Assets)

rr_ManagementFeesOverAssets

0.49%

Shareholder Service Fees

rr_Component1OtherExpensesOverAssets

0.19%

Other Operating Expenses

rr_Component2OtherExpensesOverAssets

0.23%

Other Expenses (as a percentage of Assets):

rr_OtherExpensesOverAssets

0.42%

Expenses (as a percentage of Assets)

rr_ExpensesOverAssets

0.91%

Fee Waiver or Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

none

^[7]

Net Expenses (as a percentage of Assets)

rr_NetExpensesOverAssets

0.91%

^[7]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 93

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

290

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

504

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

$ 1,120

Label

rr_AverageAnnualReturnLabel

Common Stock Fund - Class SC

1 Year

rr_AverageAnnualReturnYear01

27.57%

5 Years

rr_AverageAnnualReturnYear05

17.52%

10 Years

rr_AverageAnnualReturnYear10

15.19%

TOUCHSTONE VARIABLE SERIES TRUST | Touchstone Small Company Fund

Prospectus [Line Items]

rr_ProspectusLineItems

Risk/Return [Heading]

rr_RiskReturnHeading

Touchstone Small Company Fund

Objective [Heading]

rr_ObjectiveHeading

The Fund’s Investment Goal

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The Touchstone Small Company Fund (the “Fund”) seeks to provide investors with growth of capital.

Expense [Heading]

rr_ExpenseHeading

The Fund’s Fees and Expenses

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Fund 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

April 29, 2023

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover.

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

67.00%

Expense Example [Heading]

rr_ExpenseExampleHeading

Example.

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Strategy [Heading]

rr_StrategyHeading

The Fund’s Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

The Fund normally invests at least 80% of its assets in small-capitalization companies. This is a non–fundamental investment policy that can be changed by the Fund upon 60 days' prior notice to shareholders. For this purpose, small capitalization companies are companies that have market capitalizations within the range represented in the Russell 2000® Index (between approximately $22 million and $14.2 billion as of March 31, 2022). The market cap range of the Russell 2000® Index will change with market conditions. For these purposes, an issuer's market cap is determined at the time of purchase.

The Fund seeks to invest primarily in common stocks of small companies that Fort Washington Investment Advisors, Inc., the Fund's sub-advisor, believes are high quality, have superior business models, solid management teams, sustainable growth potential and are attractively valued. The Fund may invest without limitation in foreign securities, although only where the securities are trading in the U.S. or Canada and only where trading is denominated in U.S. or Canadian dollars.

Up to 25% of the Fund's assets may be invested in securities within a single industry. Although the Fund may invest in any economic sector, at times it may emphasize one or more particular sectors. At times the Fund may have less than 80% of its investments in companies within the market cap range of the Russell 2000® Index due to market appreciation.

The Fund typically sells a security if the portfolio manager believes it is overvalued, if the original investment premise is no longer true, if the holding size exceeds the portfolio manager's company or sector weighting guidelines and/or to take advantage of a more attractive investment opportunity. The Fund may also sell a partial position in a security in order to manage the size of the position. A security may also be sold to meet redemptions.

Risk [Heading]

rr_RiskHeading

The Fund’s Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

The Fund’s share price will fluctuate. You could lose money on your investment in the Fund and the Fund could also return less than other investments. Investments in the Fund are not bank guaranteed, are not deposits, and are not insured by the FDIC or any other federal government agency. As with any mutual fund, there is no guarantee that the Fund will achieve its investment goal. You can find more information about the Fund’s investments and risks under the “Principal Investment Strategies and Risks” section of the Fund’s prospectus. The Fund is subject to the principal risks summarized below.

•Small-Cap Risk: Stocks of smaller companies may be subject to more abrupt or erratic market movements than stocks of larger, more established companies. Small companies may have limited product lines or financial resources and may be dependent upon a small or inexperienced management group.

service providers are susceptible to operational and information or cyber security risks that could result in losses to the Fund and its shareholders. Cyber security breaches are either intentional or unintentional events that allow an unauthorized party to gain access to Fund assets, customer data, or proprietary information, or cause the Fund or Fund service provider to suffer data corruption or lose operational functionality. A cyber security breach could result in the loss or theft of customer data or funds, loss or theft of proprietary information or corporate data, physical damage to a computer or network system, or costs associated with system repairs, any of which could have a substantial impact on the Fund. Such incidents could affect issuers in which the Fund invests, thereby causing the Fund’s investments to lose value.

Sector and Industry Focus Risk: The Fund may invest a high percentage of its assets in specific sectors and/or industries of the market in order to achieve a potentially greater investment return. As a result, the Fund may be more susceptible to economic, political, and regulatory developments in a particular sector or industry of the market, positive or negative, than a fund that does not invest a high percentage of its assets in specific sectors or industries.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could lose money on your investment in the Fund and the Fund could also return less than other investments.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

Investments in the Fund are not bank guaranteed, are not deposits, and are not insured by the FDIC or any other federal government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

The Fund’s Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

On October 27, 2017, the Sentinel Variable Products Small Company Fund, previously a series of Sentinel Variable Products Trust (the "Predecessor Fund"), was reorganized into the Fund. As a result of the reorganization, the performance history of the Predecessor Fund was assumed by the Fund. Performance information prior to October 27, 2017 is that of the Predecessor Fund.

The bar chart and the performance table below illustrate some indication of the risks and volatility of an investment in the Fund by showing changes in the Fund’s performance from calendar year to calendar year and by showing how the Fund’s average annual total returns for one year, five years, and ten years compare with the Russell 2000® Index. The performance information shown does not reflect fees that are paid by the separate accounts through which shares of the Fund are sold. Inclusion of those fees would reduce the total return figures for all periods. Past performance does not necessarily indicate how the Fund will perform in the future. More recent performance information is available at no cost by visiting TouchstoneInvestments.com or by calling 1.800.543.0407.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

1.800.543.0407

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

TouchstoneInvestments.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance does not necessarily indicate how the Fund will perform in the future.

Bar Chart [Heading]

rr_BarChartHeading

Touchstone Small Company Fund - Performance as of December 31

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock


Best Quarter: Fourth Quarter 2020 35.53%						Worst Quarter: First Quarter 2020 (30.10)%

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total ReturnsFor the Periods Ended December 31, 2021

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

After-tax returns are not relevant to investors who hold their Fund shares through tax-deferred arrangements.

Performance Table Closing [Text Block]

rr_PerformanceTableClosingTextBlock

TOUCHSTONE VARIABLE SERIES TRUST | Touchstone Small Company Fund | Russell 2000 Index

Prospectus [Line Items]

rr_ProspectusLineItems

Index No Deduction for Fees, Expenses, Taxes [Text]

rr_IndexNoDeductionForFeesExpensesTaxes

(reflects no deductions for fees, expenses or taxes)

Label

rr_AverageAnnualReturnLabel

Russell 2000® Index (reflects no deductions for fees, expenses or taxes)

1 Year

rr_AverageAnnualReturnYear01

14.82%

5 Years

rr_AverageAnnualReturnYear05

12.02%

10 Years

rr_AverageAnnualReturnYear10

13.23%

TOUCHSTONE VARIABLE SERIES TRUST | Touchstone Small Company Fund | Touchstone Small Company Fund

Prospectus [Line Items]

rr_ProspectusLineItems

Management Fees (as a percentage of Assets)

rr_ManagementFeesOverAssets

0.50%

Other Expenses (as a percentage of Assets):

rr_OtherExpensesOverAssets

0.29%

Expenses (as a percentage of Assets)

rr_ExpensesOverAssets

0.79%

Fee Waiver or Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.03%)

^[8]

Net Expenses (as a percentage of Assets)

rr_NetExpensesOverAssets

0.76%

^[8]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 78

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

249

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

436

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

$ 975

Annual Return 2012

rr_AnnualReturn2012

11.44%

Annual Return 2013

rr_AnnualReturn2013

34.72%

Annual Return 2014

rr_AnnualReturn2014

6.68%

Annual Return 2015

rr_AnnualReturn2015

(1.34%)

Annual Return 2016

rr_AnnualReturn2016

20.23%

Annual Return 2017

rr_AnnualReturn2017

19.12%

Annual Return 2018

rr_AnnualReturn2018

(7.98%)

Annual Return 2019

rr_AnnualReturn2019

21.40%

Annual Return 2020

rr_AnnualReturn2020

18.70%

Annual Return 2021

rr_AnnualReturn2021

24.18%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Best Quarter:

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Dec. 31, 2020

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

35.53%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Worst Quarter:

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Mar. 31, 2020

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(30.10%)

Label

rr_AverageAnnualReturnLabel

Small Company Fund

1 Year

rr_AverageAnnualReturnYear01

24.18%

5 Years

rr_AverageAnnualReturnYear05

14.42%

10 Years

rr_AverageAnnualReturnYear10

14.06%

[1]	Total Annual Fund Operating Expenses include Acquired Fund Fees and Expenses and will differ from the ratios of expenses to average net assets that are included in the Fund’s annual report for the fiscal year ended December 31, 2021.
[2]	Touchstone Advisors, Inc. (the "Advisor" or "Touchstone Advisors") and Touchstone Variable Series Trust (the “Trust”) have entered into a contractual expense limitation agreement whereby Touchstone Advisors will waive a portion of its fees or reimburse certain Fund expenses (excluding dividend and interest expenses relating to short sales; interest; taxes; brokerage commissions and other transaction costs; portfolio transaction and investment related expenses, including expenses associated with the Fund's liquidity providers; other expenditures which are capitalized in accordance with U.S. generally accepted accounting principles; the cost of “Acquired Fund Fees and Expenses,” if any; and other extraordinary expenses not incurred in the ordinary course of business) in order to limit annual Fund operating expenses to 0.79% of average daily net assets for both Class I and Class SC shares. This contractual expense limitation is effective through April 29, 2023, but can be terminated by a vote of the Board of Trustees of the Trust (the "Board") if it deems the termination to be beneficial to the Fund's shareholders. The terms of the contractual expense limitation agreement provide that Touchstone Advisors is entitled to recoup, subject to approval by the Board, such amounts waived or reimbursed for a period of up to three years from the date on which the Advisor reduced its compensation or assumed expenses for the Fund. The Fund will make repayments to the Advisor only if such repayment does not cause the annual Fund operating expenses (after the repayment is taken into account) to exceed both (1) the expense cap in place when such amounts were waived or reimbursed and (2) the Fund’s current expense limitation.
[3]	Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement will differ from the ratio of net expenses to average net assets that is included in the Fund's annual report for the fiscal year ended December 31, 2021 due to a contractual change in the Fund's expense limitation agreement effective April 13, 2021.
[4]	Returns are not presented for Class SC shares. That share class commenced operations on April 13, 2021. Performance information for Class SC shares will be shown when that share class has a full calendar year of operations.
[5]	Total Annual Fund Operating Expenses include Acquired Fund Fees and Expenses and will differ from the ratios of expenses to average net assets that are included in the Fund’s annual report for the fiscal year ended December 31, 2021.
[6]	Touchstone Advisors, Inc. (the "Advisor" or "Touchstone Advisors") and Touchstone Variable Series Trust (the “Trust”) have entered into a contractual expense limitation agreement whereby Touchstone Advisors will waive a portion of its fees or reimburse certain Fund expenses (excluding dividend and interest expenses relating to short sales; interest; taxes; brokerage commissions and other transaction costs; portfolio transaction and investment related expenses, including expenses associated with the Fund's liquidity providers; other expenditures which are capitalized in accordance with U.S. generally accepted accounting principles; the cost of “Acquired Fund Fees and Expenses,” if any; and other extraordinary expenses not incurred in the ordinary course of business) in order to limit annual Fund operating expenses to 0.67% and 0.97% of average daily net assets for Class I and Class SC shares, respectively. This contractual expense limitation is effective through April 29, 2023, but can be terminated by a vote of the Board of Trustees of the Trust (the "Board") if it deems the termination to be beneficial to the Fund's shareholders. The terms of the contractual expense limitation agreement provide that Touchstone Advisors is entitled to recoup, subject to approval by the Board, such amounts waived or reimbursed for a period of up to three years from the date on which the Advisor reduced its compensation or assumed expenses for the Fund. The Fund will make repayments to the Advisor only if such repayment does not cause the annual Fund operating expenses (after the repayment is taken into account) to exceed both (1) the expense cap in place when such amounts were waived or reimbursed and (2) the Fund’s current expense limitation.
[7]	Touchstone Advisors, Inc. (the "Advisor" or "Touchstone Advisors") and Touchstone Variable Series Trust (the "Trust") have entered into a contractual expense limitation agreement whereby Touchstone Advisors will waive a portion of its fees or reimburse certain Fund expenses (excluding dividend and interest expenses relating to short sales; interest; taxes; brokerage commissions and other transaction costs; portfolio transaction and investment related expenses, including expenses associated with the Fund's liquidity providers; other expenditures which are capitalized in accordance with U.S. generally accepted accounting principles; the cost of "Acquired Fund Fees and Expenses," if any; and other extraordinary expenses not incurred in the ordinary course of business) in order to limit annual Fund operating expenses to 0.73% and 1.06% of average daily net assets for Class I and Class SC shares, respectively. This contractual expense limitation is effective through April 29, 2023, but can be terminated by a vote of the Board of Trustees of the Trust (the "Board") if it deems the termination to be beneficial to the Fund's shareholders. The terms of the contractual expense limitation agreement provide that Touchstone Advisors is entitled to recoup, subject to approval by the Board, such amounts waived or reimbursed for a period of up to three years from the date on which the Advisor reduced its compensation or assumed expenses for the Fund. The Fund will make repayments to the Advisor only if such repayment does not cause the annual Fund operating expenses (after the repayment is taken into account) to exceed both (1) the expense cap in place when such amounts were waived or reimbursed and (2) the Fund’s current expense limitation.
[8]	Touchstone Advisors, Inc. (the "Advisor" or "Touchstone Advisors") and Touchstone Variable Series Trust (the "Trust") have entered into a contractual expense limitation agreement whereby Touchstone Advisors will waive a portion of its fees or reimburse certain Fund expenses (excluding dividend and interest expenses relating to short sales; interest; taxes; brokerage commissions and other transaction costs; portfolio transaction and investment related expenses, including expenses associated with the Fund's liquidity providers; other expenditures which are capitalized in accordance with U.S. generally accepted accounting principles; the cost of "Acquired Fund Fees and Expenses," if any; and other extraordinary expenses not incurred in the ordinary course of business) in order to limit annual Fund operating expenses to 0.76% of average daily net assets. This contractual expense limitation is effective through April 29, 2023, but can be terminated by a vote of the Board of Trustees of the Trust (the "Board") if it deems the termination to be beneficial to the Fund's shareholders. The terms of the contractual expense limitation agreement provide that the Advisor is entitled to recoup, subject to approval by the Board, such amounts waived or reimbursed for a period of up to three years from the date on which the Advisor reduced its compensation or assumed expenses for the Fund. The Fund will make repayments to the Advisor only if such repayment does not cause the annual Fund operating expenses (after the repayment is taken into account) to exceed both (1) the expense cap in place when such amounts were waived or reimbursed and (2) the Fund’s current expense limitation.