S000002887 [Member] Annual Fund Operating Expenses - BlackRock Global Allocation V.I. Fund |
Dec. 31, 2025 |
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| 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) | 0.65% | [1] | ||||||||
| Distribution and Service (12b-1) Fees | 0.00% | |||||||||
| Other Expenses (as a percentage of Assets): | 0.13% | [2] | ||||||||
| Acquired Fund Fees and Expenses | 0.02% | |||||||||
| Expenses (as a percentage of Assets) | 0.80% | [3] | ||||||||
| Fee Waiver or Reimbursement | (0.04%) | [1],[4] | ||||||||
| Net Expenses (as a percentage of Assets) | 0.76% | [1],[4] | ||||||||
| Class II | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Management Fees (as a percentage of Assets) | 0.65% | [1] | ||||||||
| Distribution and Service (12b-1) Fees | 0.15% | |||||||||
| Other Expenses (as a percentage of Assets): | 0.23% | [2] | ||||||||
| Acquired Fund Fees and Expenses | 0.02% | |||||||||
| Expenses (as a percentage of Assets) | 1.05% | [3] | ||||||||
| Fee Waiver or Reimbursement | (0.14%) | [1],[4] | ||||||||
| Net Expenses (as a percentage of Assets) | 0.91% | [1],[4] | ||||||||
| Class III | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Management Fees (as a percentage of Assets) | 0.65% | [1] | ||||||||
| Distribution and Service (12b-1) Fees | 0.25% | |||||||||
| Other Expenses (as a percentage of Assets): | 0.23% | [2] | ||||||||
| Acquired Fund Fees and Expenses | 0.02% | |||||||||
| Expenses (as a percentage of Assets) | 1.15% | [3] | ||||||||
| Fee Waiver or Reimbursement | (0.14%) | [1],[4] | ||||||||
| Net Expenses (as a percentage of Assets) | 1.01% | [1],[4] | ||||||||
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