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S000002884 [Member] Annual Fund Operating Expenses - BlackRock Government Money Market V.I. Fund
Dec. 31, 2025
Prospectus [Line Items]  
Fee Waiver or Reimbursement over Assets, Date of Termination June 30, 2027
Class I  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.50%
Distribution and Service (12b-1) Fees 0.00%
Other Expenses (as a percentage of Assets): 0.14%
Expenses (as a percentage of Assets) 0.64%
Fee Waiver or Reimbursement (0.34%) [1]
Net Expenses (as a percentage of Assets) 0.30% [1]
[1]
As described in the “Management of the Funds” section of the Fund’s prospectus, BlackRock Advisors, LLC (“BlackRock”) has contractually agreed to waive and/or reimburse fees or expenses in order to limit Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements (excluding Dividend Expense, Interest Expense, Acquired Fund Fees and Expenses and certain other Fund expenses) to 0.30% (for Class I Shares) of average daily net assets through June 30, 2027. This contractual agreement may be terminated upon 90 days’ notice by a majority of the non‑interested directors of BlackRock Variable Series Funds, Inc. or by a vote of a majority of the outstanding voting securities of the Fund.