Investment Strategy - Voya Intermediate Bond Portfolio	Dec. 31, 2024
Prospectus [Line Items]
Strategy [Heading]	<span style="color:#000000;font-family:Arial;font-size:11.16pt;font-weight:bold;text-transform:uppercase;">Principal Investment Strategies</span>
Strategy Narrative [Text Block]	Under normal circumstances, the Portfolio invests at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in a portfolio of bonds. For purposes of this 80% policy, bonds include, without limitation, bonds, debt instruments, and other fixed income and income-producing debt instruments, of any kind, issued or guaranteed by governmental or private-sector entities. The Portfolio invests primarily in debt instruments rated investment grade, including, but not limited to, corporate, government and mortgage bonds. Investment grade refers to a rating given by one or more nationally recognized statistical rating organizations (“NRSROs”) (e.g., rated Baa3 or above by Moody’s Ratings (“Moody’s”), or BBB- or above by S&P Global Ratings (“S&P”) or Fitch Ratings, Inc. (“Fitch”)) or, if unrated, determined by the Portfolio to be of comparable quality. Although the Portfolio may invest a portion of its assets in debt instruments rated below investment grade (sometimes referred to as “high-yield securities”, “high-yield bonds”, or “junk bonds”), the Portfolio will seek to maintain a minimum weighted average portfolio quality rating of at least investment grade. Below investment grade refers to a rating given by one or more NRSROs (e.g., rated Ba1 or below by Moody’s, or BB+ or below by S&P or Fitch) or, if unrated, determined by the Portfolio to be of comparable quality. The dollar-weighted average duration of the Portfolio will generally range between three and ten years. Duration is a commonly used measure of risk in debt instruments as it incorporates multiple features of debt instruments (e.g., yield, coupon, maturity, etc.) into one number. Duration is a measure of sensitivity of the price of a debt instrument to a change in interest rates. Duration is a weighted average of the times that interest payments and the final return of principal are received. The weights are the amounts of the payments discounted by the yield-to-maturity of the debt instrument. Duration is expressed as a number of years. The bigger the duration number, the greater the interest rate risk or reward for the debt instrument prices. For example, the price of a bond with an average duration of 5 years would be expected to fall approximately 5% if market interest rates rose by 1%. Conversely, the price of a bond with an average duration of 5 years would be expected to rise approximately 5% if market interest rates dropped by 1%. The Portfolio may also invest in: preferred stock; high quality money market instruments; municipal bonds; debt instruments of foreign (non-U.S.) issuers (including those located in emerging market countries); securities denominated in foreign (non-U.S.) currencies; foreign (non-U.S.) currencies; mortgage-backed and asset-backed securities; bank loans and floating rate secured loans (“Senior Loans”); and derivatives including futures, options, and swaps (including credit default swaps, interest rate swaps and total return swaps) involving securities, securities indices and interest rates, which may be denominated in the U.S. dollar or foreign (non-U.S.) currencies. The Portfolio typically uses derivatives to reduce exposure to other risks, such as interest rate or currency risk, to substitute for taking a position in the underlying asset, and/or to enhance returns in the Portfolio. The Portfolio may seek to obtain exposure to the securities in which it invests by entering into a series of purchase and sale contracts or through other investment techniques such as buy backs and dollar rolls. Buy backs and dollar rolls involve selling securities and simultaneously entering into a commitment to purchase those or similar securities on a specified future date and price from the same party. The Portfolio may invest in other investment companies, including exchange-traded funds (“ETFs”), to the extent permitted under the Investment Company Act of 1940, as amended, and the rules and regulations thereunder, and under the terms of applicable no-action relief or exemptive orders granted thereunder. The sub-adviser (the “Sub-Adviser”) believes that relationships between the drivers of debt instrument returns change over time and that recognizing this is key to managing such assets. Therefore, the Sub-Adviser employs a dynamic investment process that seeks to balance top-down macro economic considerations and fundamental bottom-up analysis during the steps of its investment process - sector allocation, security selection, duration, and yield curve management. This includes utilizing proprietary qualitative analysis along with quantitative tools throughout the portfolio construction process. In evaluating investments for the Portfolio, the Sub-Adviser takes into account a wide variety of factors and considerations to determine whether any or all of those factors or considerations might have a material effect on the value, risks, or prospects of an investment. Among the factors considered, the Sub-Adviser expects typically to take into account environmental, social, and governance (“ESG”) factors to determine whether one or more factors may have a material effect. In considering ESG factors, the Sub-Adviser intends to rely primarily on factors identified through its proprietary empirical research and on third-party evaluations of an issuer’s ESG standing. ESG factors will be only one of many considerations in the Sub-Adviser’s evaluation of any potential investment; the extent to which ESG factors will affect the Sub-Adviser’s decision to invest in an issuer, if at all, will depend on the analysis and judgment of the Sub-Adviser. The Sub-Adviser may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into opportunities believed to be more promising. The Portfolio may lend portfolio securities on a short-term or long-term basis, up to 33 1∕3% of its total assets.

Investment Strategy - Voya Intermediate Bond Portfolio

Dec. 31, 2024

<span style="color:#000000;font-family:Arial;font-size:11.16pt;font-weight:bold;text-transform:uppercase;">Principal Investment Strategies</span>

Strategy Narrative [Text Block]

Under normal circumstances, the Portfolio invests at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in a portfolio of bonds. For purposes of this 80% policy, bonds include, without limitation, bonds, debt instruments, and other fixed income and income-producing debt instruments, of any kind, issued or guaranteed by governmental or private-sector entities. The Portfolio invests primarily in debt instruments rated investment grade, including, but not limited to, corporate, government and mortgage bonds. Investment grade refers to a rating given by one or more nationally recognized statistical rating organizations (“NRSROs”) (e.g., rated Baa3 or above by Moody’s Ratings (“Moody’s”), or BBB- or above by S&P Global Ratings (“S&P”) or Fitch Ratings, Inc. (“Fitch”)) or, if unrated, determined by the Portfolio to be of comparable quality. Although the Portfolio may invest a portion of its assets in debt instruments rated below investment grade (sometimes referred to as “high-yield securities”, “high-yield bonds”, or “junk bonds”), the Portfolio will seek to maintain a minimum weighted average portfolio quality rating of at least investment grade. Below investment grade refers to a rating given by one or more NRSROs (e.g., rated Ba1 or below by Moody’s, or BB+ or below by S&P or Fitch) or, if unrated, determined by the Portfolio to be of comparable quality. The dollar-weighted average duration of the Portfolio will generally range between three and ten years. Duration is a commonly used measure of risk in debt instruments as it incorporates multiple features of debt instruments (e.g., yield, coupon, maturity, etc.) into one number. Duration is a measure of sensitivity of the price of a debt instrument to a change in interest rates. Duration is a weighted average of the times that interest payments and the final return of principal are received. The weights are the amounts of the payments discounted by the yield-to-maturity of the debt instrument. Duration is expressed as a number of years. The bigger the duration number, the greater the interest rate risk or reward for the debt instrument prices. For example, the price of a bond with an average duration of 5 years would be expected to fall approximately 5% if market interest rates rose by 1%. Conversely, the price of a bond with an average duration of 5 years would be expected to rise approximately 5% if market interest rates dropped by 1%. The Portfolio may also invest in: preferred stock; high quality money market instruments; municipal bonds; debt instruments of foreign (non-U.S.) issuers (including those located in emerging market countries); securities denominated in foreign (non-U.S.) currencies; foreign (non-U.S.) currencies; mortgage-backed and asset-backed securities; bank loans and floating rate secured loans (“Senior Loans”); and derivatives including futures, options, and swaps (including credit default swaps, interest rate swaps and total return swaps) involving securities, securities indices and interest rates, which may be denominated in the U.S. dollar or foreign (non-U.S.) currencies. The Portfolio typically uses derivatives to reduce exposure to other risks, such as interest rate or currency risk, to substitute for taking a position in the underlying asset, and/or to enhance returns in the Portfolio. The Portfolio may seek to obtain exposure to the securities in which it invests by entering into a series of purchase and sale contracts or through other investment techniques such as buy backs and dollar rolls. Buy backs and dollar rolls involve selling securities and simultaneously entering into a commitment to purchase those or similar securities on a specified future date and price from the same party. The Portfolio may invest in other investment companies, including exchange-traded funds (“ETFs”), to the extent permitted under the Investment Company Act of 1940, as amended, and the rules and regulations thereunder, and under the terms of applicable no-action relief or exemptive orders granted thereunder. The sub-adviser (the “Sub-Adviser”) believes that relationships between the drivers of debt instrument returns change over time and that recognizing this is key to managing such assets. Therefore, the Sub-Adviser employs a dynamic investment process that seeks to balance top-down macro economic considerations and fundamental bottom-up analysis during the steps of its investment process - sector allocation, security selection, duration, and yield curve management. This includes utilizing proprietary qualitative analysis along with quantitative tools throughout the portfolio construction process. In evaluating investments for the Portfolio, the Sub-Adviser takes into account a wide variety of factors and considerations to determine whether any or all of those factors or considerations might have a material effect on the value, risks, or prospects of an investment. Among the factors considered, the Sub-Adviser expects typically to take into account environmental, social, and governance (“ESG”) factors to determine whether one or more factors may have a material effect. In considering ESG factors, the Sub-Adviser intends to rely primarily on factors identified through its proprietary empirical research and on third-party evaluations of an issuer’s ESG standing. ESG factors will be only one of many considerations in the Sub-Adviser’s evaluation of any potential investment; the extent to which ESG factors will affect the Sub-Adviser’s decision to invest in an issuer, if at all, will depend on the analysis and judgment of the Sub-Adviser. The Sub-Adviser may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into opportunities believed to be more promising. The Portfolio may lend portfolio securities on a short-term or long-term basis, up to 33 1∕3% of its total assets.