Brighthouse Small Cap Value Portfolio Investment Strategy - Brighthouse Small Cap Value 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]	Allspring Global Investments, LLC (“Allspring Investments”), the subadviser to the Portfolio (the “Subadviser”), invests the Portfolio’s assets, under normal circumstances, in equity securities of small companies whose stock price appears to be below their underlying value and who exhibit the potential for above average capital growth. Under normal circumstances, the Portfolio expects to invest at least 80% of its net assets in securities of companies that are considered small. The Portfolio considers a “small company” to be one whose market capitalization is within the range of capitalizations during the most recent 12-month period of companies in the Russell 2000® Index or the S&P Small Cap 600® Index at the time of investment (based on month-end data). The Portfolio may invest up to 25% of its assets in foreign securities and up to 15% of its assets in real estate investment trusts (“REITs”). The Portfolio may, from time to time, emphasize one or more sectors. In identifying companies in which to invest, the Subadviser may consider, among other factors, a company’s financial strength, its management, its cash flow, its use of financial leverage, and its price-to-earnings ratio. The Subadviser also may consider the prospects for a company’s industry, whether or not the company is out of favor in the marketplace as reflected in the company’s stock price, and whether or not the company is undergoing a reorganization or other change that may create a more favorable outlook going forward. The Portfolio will generally sell an investment when there has been a fundamental change in the business or capital structure of the company which significantly affects the investment’s inherent value, when a portfolio holding’s stock price nears its intrinsic value appreciation target, the industry or general market environment becomes unfavorable, or the Subadviser identifies a more attractive investment opportunity.

Brighthouse Small Cap Value Portfolio Investment Strategy - Brighthouse Small Cap Value 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]

Allspring Global Investments, LLC (“Allspring Investments”), the subadviser to the Portfolio (the “Subadviser”), invests the Portfolio’s assets, under normal circumstances, in equity securities of small companies whose stock price appears to be below their underlying value and who exhibit the potential for above average capital growth. Under normal circumstances, the Portfolio expects to invest at least 80% of its net assets in securities of companies that are considered small. The Portfolio considers a “small company” to be one whose market capitalization is within the range of capitalizations during the most recent 12-month period of companies in the Russell 2000® Index or the S&P Small Cap 600® Index at the time of investment (based on month-end data). The Portfolio may invest up to 25% of its assets in foreign securities and up to 15% of its assets in real estate investment trusts (“REITs”). The Portfolio may, from time to time, emphasize one or more sectors. In identifying companies in which to invest, the Subadviser may consider, among other factors, a company’s financial strength, its management, its cash flow, its use of financial leverage, and its price-to-earnings ratio. The Subadviser also may consider the prospects for a company’s industry, whether or not the company is out of favor in the marketplace as reflected in the company’s stock price, and whether or not the company is undergoing a reorganization or other change that may create a more favorable outlook going forward. The Portfolio will generally sell an investment when there has been a fundamental change in the business or capital structure of the company which significantly affects the investment’s inherent value, when a portfolio holding’s stock price nears its intrinsic value appreciation target, the industry or general market environment becomes unfavorable, or the Subadviser identifies a more attractive investment opportunity.