S000002877 [Member] Investment Strategy - BlackRock Large Cap Focus Growth V.I. Fund |
Dec. 31, 2025 |
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| Prospectus [Line Items] | |
| Strategy [Heading] | Principal Investment Strategies of the Fund |
| Strategy Narrative [Text Block] | Under normal circumstances, the Fund seeks to invest at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in large cap growth equity securities and derivatives that provide investment exposure to such securities or to one or more market risk factors associated with such securities. For purposes of the Fund’s 80% policy, large cap growth equity securities are equity securities that (i) at the time of purchase have a market capitalization within the range of companies included in the Russell 1000® Growth Index (the “Russell 1000 Growth Index”) and (ii) are included within at least one growth index, as determined by BlackRock (the “Growth Indices”). Currently, such Growth Indices are the Russell 3000® Growth Index, the S&P Composite 1500® Growth Index and the MSCI World Growth Index. The Russell 1000 Growth Index is a capitalization-weighted index from a broad range of industries chosen for market size, liquidity and industry group representation. Equity securities consist of common stock, preferred stock, other financial instruments that are components of, or have characteristics similar to, the securities included in the Growth Indices, and American Depositary Receipts (“ADRs”). The Fund is an aggressive growth fund that generally invests in not less than 25 to not more than 60 aggressive growth companies. The Fund emphasizes large companies that exhibit above-average growth and accelerating earnings. The Fund may invest without limitation in the securities of foreign companies in the form of ADRs. In addition to ADRs, the Fund may also invest up to 20% of its total assets in other forms of securities of foreign companies, including European Depositary Receipts, which are receipts typically issued in Europe evidencing an ownership arrangement with the foreign company or other securities of foreign companies. The Fund may invest across different market sectors and industries, and at times may have material investment exposure to one or more sectors or industries.
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