S000003883 [Member] Investment Strategy - Putnam VT Small Cap Growth Fund |
Dec. 31, 2025 |
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| Prospectus [Line Items] | |
| Strategy [Heading] | Investments, risks, and performance Investments |
| Strategy Narrative [Text Block] | The fund invests mainly in common stocks of small U.S. companies, with a focus on growth stocks. Growth stocks are stocks of companies whose earnings are expected to grow faster than those of similar firms, and whose business growth and other characteristics may lead to an increase in stock price. Under normal circumstances, the fund invests at least 80% of the fund’s net assets in companies of a size similar to those in the Russell 2000® Growth Index. This policy may be changed only after 60 days’ notice to shareholders. As of March 31, 2026, the index was composed of companies having market capitalizations of between approximately $4.4 million and $38.3 billion. The Investment Manager, as defined below, may consider, among other factors, a company’s valuation, financial strength, growth potential, competitive position in its industry, projected future earnings, cash flows and dividends when deciding whether to buy or sell investments.
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