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TOUCHSTONE VARIABLE SERIES TRUST | Touchstone Bond Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Touchstone Bond Fund
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock
TOUCHSTONE VARIABLE SERIES TRUST

Touchstone Bond Fund (the "Fund")

Supplement dated November 29, 2022 to the current Prospectus and Summary Prospectus for the Fund dated April 29, 2022, as may be supplemented from time to time

Reduction in Advisory Fee

The Board of Trustees of the Touchstone Variable Series Trust (the “Trust”), including those Trustees who are not “interested persons” of the Trust as such term is defined in the Investment Company Act of 1940, as amended, has approved a reduction in the Fund’s advisory fee.

Effective January 1, 2023, the Fund will pay its investment adviser, Touchstone Advisors, Inc. (the “Adviser”), an advisory fee at an annualized rate of 0.38% on the first $200 million of assets and 0.30% on assets over $200 million. Prior to January 1, 2023, the Fund paid the Adviser an advisory fee at an annualized rate of 0.40% on the first $300 million of assets and 0.35% on assets over $300 million. The Fund’s advisory fee is accrued daily and paid monthly, based on the Fund’s average net assets during the month.

Operating Expense Reductions

Effective January 1, 2023, the Adviser has agreed to 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 0.61% and 0.91% of average daily net assets for Class I and Class SC shares, respectively. This contractual expense limitation agreement will be effective through April 29, 2024. Prior to January 1, 2023, the Fund’s contractual expense limitations were 0.67% and 0.97% of average daily net assets for Class I and Class SC shares, respectively.

Accordingly, effective January 1, 2023, the Annual Fund Operating Expense table and the Expense Example in the Summary Prospectus and in the summary section of the Prospectus are hereby restated as follows:
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, 2024
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Management Fees have been restated to reflect contractual changes to the Fund's Investment Advisory Agreement effective January 1, 2023.
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees 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.
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:
Supplement Closing Text Block ck0000920547_SupplementClosingTextBlock
Please contact your financial adviser or Touchstone at 800.543.0407 if you have any questions.


P.O. Box 9878 · Providence, RI 02940-8078
Ph: 800.543.0407 · TouchstoneInvestments.com

Touchstone Funds are distributed by Touchstone Securities, Inc.*
*A registered broker-dealer and member FINRA and SIPC
A Member of Western & Southern Financial Group

Please retain this Supplement for future reference.
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 0.38% [1]
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 0.77% [2]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.14%) [3]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.63% [2],[3],[4]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 64
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 232
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 414
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 941
TOUCHSTONE VARIABLE SERIES TRUST | Touchstone Bond Fund | Class SC  
Prospectus [Line Items] rr_ProspectusLineItems  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.38% [1]
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 0.79% [2]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets none [3]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.79% [2],[3],[4]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 81
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 252
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 439
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 978
[1] Management Fees have been restated to reflect contractual changes to the Fund's Investment Advisory Agreement effective January 1, 2023.
[2] 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.
[3] Touchstone Advisors, Inc. (the "Adviser" 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 0.61% and 0.91% of average daily net assets for Class I and Class SC shares, respectively. This contractual expense limitation is effective through April 29, 2024, 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 Adviser reduced its compensation or assumed expenses for the Fund. The Fund will make repayments to the Adviser 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.
[4] 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 are included in the Fund's annual report for the fiscal year ended December 31, 2021 due to contractual changes in the Fund's expense limitation agreement effective January 1, 2023.