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Disclosure - S000003887 [Member] N-1A Cover link:presentationLink link:definitionLink link:calculationLink 2010001 - Disclosure - S000003887 [Member] N-1A Supplement link:presentationLink link:definitionLink link:calculationLink Putnam VT Core Equity Fund S000003880 [Member] Russell 3000 Index (no deduction for fees, expenses or taxes) Russell 3000 Index [Member] Class IA Shares C000010855 [Member] Class IB Shares C000010856 [Member] Market risks [Member] Common stock risk [Member] Liquidity and illiquid investments risk [Member] Short sales risk [Member] Large shareholder transaction risk [Member] Management and operational risk [Member] Putnam VT Diversified Income Fund S000003893 [Member] Bloomberg U.S. Aggregate Index (no deduction for fees, expenses or taxes) Bloomberg U S Aggregate Index [Member] C000010881 [Member] C000010882 [Member] Fixed income investments risk [Member] Focused investment risk [Member] Foreign investments risk [Member] Derivatives risks [Member] Frequent trading risk [Member] Putnam VT Emerging Markets Equity Fund S000003879 [Member] MSCI All Country World Ex-U.S. Index-NR (reflects no deduction for fees, expenses or taxes but are net of dividend tax withholdings) MSCI All Country World Ex U S Index NR [Member] MSCI Emerging Markets Index-NR (index reflects no deduction for fees, expenses or taxes but are net of dividend tax withholding) MSCI Emerging Markets Index NR [Member] Putnam VT Emerging Markets Equity Linked Benchmark (no deduction for fees, expenses or taxes) Putnam VT Emerging Markets Equity Linked Benchmark [Member] C000010853 [Member] C000010854 [Member] Geographic focus risk [Member] Putnam VT Focused International Equity Fund S000003897 [Member] MSCI ACWI ex USA Index-NR (index reflects no deduction for fees, expenses or taxes but are net of dividend tax withholding) MSCI ACWI ex USA Index NR [Member] Putnam VT Focused International Equity Linked Benchmark (no deduction for fees, expenses or taxes) Putnam VT Focused 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[Member] MSCI EAFE Index-NR (index reflects no deduction for fees, expenses or taxes but are net of dividend tax withholding) MSCI EAFE Index NR [Member] C000010849 [Member] C000010850 [Member] Putnam VT International Value Fund S000003878 [Member] S000003878 MSCI All Country World Ex U S Index NR [Member] MSCI EAFE Value Index-NR (index reflects no deduction for fees, expenses or taxes but are net of dividend tax withholding) MSCI EAFE Value Index NR [Member] C000010851 [Member] C000010852 [Member] Putnam VT Large Cap Growth Fund S000003873 [Member] S000003873 Russell 3000 Index [Member] Russell 1000 Growth Index (no deduction for fees, expenses or taxes) Russell 1000 Growth Index [Member] C000010841 [Member] C000010842 [Member] Putnam VT Large Cap Value Fund S000003894 [Member] S000003894 Russell 3000 Index [Member] Russell 1000 Value Index (no deduction for fees, expenses or taxes) Russell 1000 Value Index [Member] C000010883 [Member] C000010884 [Member] Putnam VT Mortgage 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