Brighthouse Eaton Vance Floating Rate Portfolio Investment Strategy - Brighthouse Eaton Vance Floating Rate Portfolio	Dec. 31, 2025
Prospectus [Line Items]
Strategy [Heading]	<span style="color:#000000;font-family:Times New Roman;font-size:11.5pt;font-weight:bold;">Principal Investment Strategies</span>
Strategy Narrative [Text Block]	Eaton Vance Management (“Eaton Vance” or “Subadviser”), subadviser to the Portfolio, invests, under normal circumstances, at least 80% of the Portfolio’s net assets in income producing floating rate loans and other floating rate debt securities. The Portfolio invests primarily in senior floating rate loans of domestic and foreign borrowers (“Senior Loans”). Senior Loans typically are secured with specific collateral and have a claim on the assets and/or stock of the borrower that is senior to subordinated debtholders and stockholders of the borrower. Loans typically are of below investment grade quality and have below investment grade credit ratings, which ratings are associated with securities having high yield/high risk, speculative characteristics. The Portfolio may also invest in secured and unsecured subordinated loans, second lien loans and subordinated bridge loans (“Junior Loans”). In addition, the Portfolio may invest in other floating rate debt securities, fixed income debt obligations and money market instruments, which may include bonds, notes and debentures issued by corporations; debt securities issued or guaranteed by the U.S. Government or one of its agencies or instrumentalities; and commercial paper. Those money market instruments with a remaining maturity of less than 60 days will be deemed floating rate debt securities. Senior Loans and Junior Loans are referred to together herein as “loans.” The Portfolio may invest up to 20% of its total assets in foreign Senior Loans and foreign securities. Foreign Senior Loans must be U.S. dollar denominated or be denominated in Euros, British pounds, Swiss francs, or Canadian dollars (each such foreign currency, an “Authorized Foreign Currency”). Eaton Vance’s portfolio managers seek to maintain broad borrower and industry diversification among the Portfolio’s loans. When selecting loans, the portfolio managers seek to implement a systematic risk-weighted approach that utilizes fundamental analysis of risk/return characteristics. Loans may be sold if, in the opinion of Eaton Vance’s portfolio managers, the risk-return profile deteriorates or if the portfolio managers wish to pursue more attractive investment opportunities. In managing the Portfolio, Eaton Vance seeks to invest in a portfolio of loans that it believes will be less volatile over time than the general loan market. Preservation of capital is considered when consistent with the Portfolio’s objective. For more information about the types of investments in which the Portfolio may invest, please see “Investment Strategies and Risks” in the Statement of Additional Information.

Brighthouse Eaton Vance Floating Rate Portfolio Investment Strategy - Brighthouse Eaton Vance Floating Rate Portfolio

Dec. 31, 2025

<span style="color:#000000;font-family:Times New Roman;font-size:11.5pt;font-weight:bold;">Principal Investment Strategies</span>

Strategy Narrative [Text Block]

Eaton Vance Management (“Eaton Vance” or “Subadviser”), subadviser to the Portfolio, invests, under normal circumstances, at least 80% of the Portfolio’s net assets in income producing floating rate loans and other floating rate debt securities. The Portfolio invests primarily in senior floating rate loans of domestic and foreign borrowers (“Senior Loans”). Senior Loans typically are secured with specific collateral and have a claim on the assets and/or stock of the borrower that is senior to subordinated debtholders and stockholders of the borrower. Loans typically are of below investment grade quality and have below investment grade credit ratings, which ratings are associated with securities having high yield/high risk, speculative characteristics. The Portfolio may also invest in secured and unsecured subordinated loans, second lien loans and subordinated bridge loans (“Junior Loans”). In addition, the Portfolio may invest in other floating rate debt securities, fixed income debt obligations and money market instruments, which may include bonds, notes and debentures issued by corporations; debt securities issued or guaranteed by the U.S. Government or one of its agencies or instrumentalities; and commercial paper. Those money market instruments with a remaining maturity of less than 60 days will be deemed floating rate debt securities. Senior Loans and Junior Loans are referred to together herein as “loans.” The Portfolio may invest up to 20% of its total assets in foreign Senior Loans and foreign securities. Foreign Senior Loans must be U.S. dollar denominated or be denominated in Euros, British pounds, Swiss francs, or Canadian dollars (each such foreign currency, an “Authorized Foreign Currency”). Eaton Vance’s portfolio managers seek to maintain broad borrower and industry diversification among the Portfolio’s loans. When selecting loans, the portfolio managers seek to implement a systematic risk-weighted approach that utilizes fundamental analysis of risk/return characteristics. Loans may be sold if, in the opinion of Eaton Vance’s portfolio managers, the risk-return profile deteriorates or if the portfolio managers wish to pursue more attractive investment opportunities. In managing the Portfolio, Eaton Vance seeks to invest in a portfolio of loans that it believes will be less volatile over time than the general loan market. Preservation of capital is considered when consistent with the Portfolio’s objective. For more information about the types of investments in which the Portfolio may invest, please see “Investment Strategies and Risks” in the Statement of Additional Information.