Brighthouse Wellington Large Cap Research Portfolio Investment Strategy - Brighthouse Wellington Large Cap Research 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]	Wellington Management Company LLP (“Wellington Management” or “Subadviser”), subadviser to the Portfolio, invests the Portfolio’s assets, under normal circumstances, primarily in equity securities of U.S. companies and, to a lesser extent, of foreign companies. Under normal circumstances, the Portfolio invests at least 80% of its net assets in securities of large-capitalization companies. The Portfolio considers a company to be a large-capitalization company if it has a market capitalization at the time of purchase that falls within the market capitalization range of companies included in the Russell 1000® Index or the S&P 500® Index. As of December 31, 2025, the lowest capitalization of companies in the Russell 1000 Index was $144.9 million, while the lowest capitalization of companies in the S&P 500 Index was $5.5 billion as of that date. The market capitalization limits will vary with market fluctuations. Equity securities may include common stocks, preferred stocks, American Depositary Receipts (“ADRs”), rights and warrants. In managing the Portfolio, Wellington Management allocates the Portfolio’s assets across a variety of industries, selecting companies in each industry based on the research of Wellington Management’s team of global industry analysts. The Portfolio typically seeks to maintain representation in each major industry represented by broad-based, large cap U.S. equity indices. The Portfolio may, from time to time, emphasize one or more sectors. Wellington Management may invest up to 15% of the Portfolio’s total net assets in securities of foreign issuers and non-dollar denominated securities. In analyzing a prospective investment for the Portfolio, Wellington Management utilizes a “bottom-up” approach, which is the use of fundamental analysis to identify specific securities for purchase or sale. Fundamental analysis of a company involves the assessment of a variety of factors, including the company’s business environment, management quality, balance sheet, income statement, anticipated earnings, revenues and dividends, and other related measures or indicators of valuation and growth potential.

Brighthouse Wellington Large Cap Research Portfolio Investment Strategy - Brighthouse Wellington Large Cap Research 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]

Wellington Management Company LLP (“Wellington Management” or “Subadviser”), subadviser to the Portfolio, invests the Portfolio’s assets, under normal circumstances, primarily in equity securities of U.S. companies and, to a lesser extent, of foreign companies. Under normal circumstances, the Portfolio invests at least 80% of its net assets in securities of large-capitalization companies. The Portfolio considers a company to be a large-capitalization company if it has a market capitalization at the time of purchase that falls within the market capitalization range of companies included in the Russell 1000® Index or the S&P 500® Index. As of December 31, 2025, the lowest capitalization of companies in the Russell 1000 Index was $144.9 million, while the lowest capitalization of companies in the S&P 500 Index was $5.5 billion as of that date. The market capitalization limits will vary with market fluctuations. Equity securities may include common stocks, preferred stocks, American Depositary Receipts (“ADRs”), rights and warrants. In managing the Portfolio, Wellington Management allocates the Portfolio’s assets across a variety of industries, selecting companies in each industry based on the research of Wellington Management’s team of global industry analysts. The Portfolio typically seeks to maintain representation in each major industry represented by broad-based, large cap U.S. equity indices. The Portfolio may, from time to time, emphasize one or more sectors. Wellington Management may invest up to 15% of the Portfolio’s total net assets in securities of foreign issuers and non-dollar denominated securities. In analyzing a prospective investment for the Portfolio, Wellington Management utilizes a “bottom-up” approach, which is the use of fundamental analysis to identify specific securities for purchase or sale. Fundamental analysis of a company involves the assessment of a variety of factors, including the company’s business environment, management quality, balance sheet, income statement, anticipated earnings, revenues and dividends, and other related measures or indicators of valuation and growth potential.