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S000003897 [Member] Annual Fund Operating Expenses - Putnam VT Focused International Equity Fund
Dec. 31, 2025
Prospectus [Line Items]  
Fee Waiver or Reimbursement over Assets, Date of Termination April 30, 2027
Class IA Shares  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.67%
Distribution and Service (12b-1) Fees 0.00%
Other Expenses (as a percentage of Assets): 0.16%
Expenses (as a percentage of Assets) 0.83%
Fee Waiver or Reimbursement (0.05%) [1]
Net Expenses (as a percentage of Assets) 0.78%
Class IB Shares  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.67%
Distribution and Service (12b-1) Fees 0.25%
Other Expenses (as a percentage of Assets): 0.16%
Expenses (as a percentage of Assets) 1.08%
Fee Waiver or Reimbursement (0.05%) [1]
Net Expenses (as a percentage of Assets) 1.03%
[1] The Investment Manager, as defined below, has contractually agreed to waive 0.05% of its management fee. This obligation may not be modified or discontinued prior to April 30, 2027 without approval of the Board of Trustees.