v3.26.1
Fees and Expenses
Dec. 31, 2025
Midcap Stock Portfolio  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and examples below. These figures also do not reflect any fees or charges imposed by participating insurance companies under their Variable Annuity contracts (VA contracts) or Variable Life Insurance policies (VLI policies), and, if such fees and/or charges were included, the fees and expenses would be higher.
Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]
Annual Fund Operating Expenses - Midcap Stock Portfolio
Initial Shares
Service Shares
Management Fees (as a percentage of Assets) 0.75% 0.75%
Distribution and Service (12b-1) Fees 0.00% 0.25%
Other Expenses (as a percentage of Assets): 0.12% 0.12%
Expenses (as a percentage of Assets) 0.87% 1.12%
Fee Waiver or Reimbursement [1] (0.07%) (0.07%)
Net Expenses (as a percentage of Assets) 0.80% 1.05%
Fee Waiver or Reimbursement over Assets, Date of Termination May 1, 2027 May 1, 2027
[1] The fund's investment adviser, BNY Mellon Investment Adviser, Inc., has contractually agreed, until May 1, 2027, to waive receipt of its fees and/or assume the direct expenses of the fund so that the direct expenses of neither class of fund shares (excluding Rule 12b-1 fees, taxes, interest expense, brokerage commissions, commitment fees on borrowings and extraordinary expenses) exceed .80%. To the extent that it is necessary for BNY Mellon Investment Adviser, Inc. to waive receipt of its management fee or reimburse the fund's common expenses, the amount of the waiver or reimbursement will be applied equally to each share class of the fund. On or after May 1, 2027, BNY Mellon Investment Adviser, Inc. may terminate this expense limitation at any time.
Expense Example [Heading] Example
Expense Example Narrative [Text Block]

The 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 assumes that you invest $10,000 in the fund for the time periods indicated and then hold or redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the fund's operating expenses remain the same. The Example does not reflect fees and expenses incurred under VA contracts and VLI policies; if they were reflected, the figures in the Example would be higher. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
Expense Example - Midcap Stock Portfolio - USD ($)
Initial Shares
Service Shares
Expense Example, with Redemption, 1 Year $ 82 $ 107
Expense Example, with Redemption, 3 Years 271 349
Expense Example, with Redemption, 5 Years 475 610
Expense Example, with Redemption, 10 Years $ 1,066 $ 1,357
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block]

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover 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 65.24% of the average value of its portfolio.
Portfolio Turnover, Rate 65.24%
Small Cap Stock Index Portfolio  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and examples below. These figures also do not reflect any fees or charges imposed by participating insurance companies under their Variable Annuity contracts (VA contracts) or Variable Life Insurance policies (VLI policies), and, if such fees and/or charges were included, the fees and expenses would be higher.
Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]
Annual Fund Operating Expenses - Small Cap Stock Index Portfolio
Service Shares
Management Fees (as a percentage of Assets) 0.35%
Distribution and Service (12b-1) Fees 0.25%
Other Expenses (as a percentage of Assets): 0.01%
Expenses (as a percentage of Assets) 0.61%
Fee Waiver or Reimbursement (0.00%) [1]
Net Expenses (as a percentage of Assets) 0.61%
[1] The fund's investment adviser, BNY Mellon Investment Adviser, Inc., has agreed in its management agreement with the fund to pay all of the fund's expenses, except management fees, interest, taxes, brokerage fees and commissions, if any, fees pursuant to any distribution or shareholder services plan adopted by the fund, fees and expenses of the non-interested board members and their counsel and independent counsel to the fund, and any extraordinary expenses. BNY Mellon Investment Adviser, Inc. has further agreed to reduce its fees in an amount equal to the fund's allocable portion of the fees and expenses of the non-interested board members and the fees and expenses of counsel to the fund and to the non-interested board members (in the amount less than .01% for the past fiscal year). These provisions in the management agreement may not be amended without the approval of the fund's shareholders.
Expense Example [Heading] Example
Expense Example Narrative [Text Block]

The 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 assumes that you invest $10,000 in the fund for the time periods indicated and then hold or redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the fund's operating expenses remain the same. The Example does not reflect fees and expenses incurred under VA contracts and VLI policies; if they were reflected, the figures in the Example would be higher. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
Expense Example - Small Cap Stock Index Portfolio
Service Shares
USD ($)
Expense Example, with Redemption, 1 Year $ 62
Expense Example, with Redemption, 3 Years 195
Expense Example, with Redemption, 5 Years 340
Expense Example, with Redemption, 10 Years $ 762
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block]

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover 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 60.63% of the average value of its portfolio.
Portfolio Turnover, Rate 60.63%
Technology Growth Portfolio  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and examples below. These figures also do not reflect any fees or charges imposed by participating insurance companies under their Variable Annuity contracts (VA contracts) or Variable Life Insurance policies (VLI policies), and, if such fees and/or charges were included, the fees and expenses would be higher.
Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]
Annual Fund Operating Expenses - Technology Growth Portfolio
Initial Shares
Service Shares
Management Fees (as a percentage of Assets) 0.75% 0.75%
Distribution and Service (12b-1) Fees 0.00% 0.25%
Other Expenses (as a percentage of Assets): 0.07% 0.07%
Expenses (as a percentage of Assets) 0.82% 1.07%
Expense Example [Heading] Example
Expense Example Narrative [Text Block]

The 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 assumes that you invest $10,000 in the fund for the time periods indicated and then hold or redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the fund's operating expenses remain the same. The Example does not reflect fees and expenses incurred under VA contracts and VLI policies; if they were reflected, the figures in the Example would be higher. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
Expense Example - Technology Growth Portfolio - USD ($)
Initial Shares
Service Shares
Expense Example, with Redemption, 1 Year $ 84 $ 109
Expense Example, with Redemption, 3 Years 262 340
Expense Example, with Redemption, 5 Years 455 590
Expense Example, with Redemption, 10 Years $ 1,014 $ 1,306
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block]

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover 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 29.88% of the average value of its portfolio.
Portfolio Turnover, Rate 29.88%