S000003866 [Member] Annual Fund Operating Expenses - BlackRock Global Allocation Portfolio |
Dec. 31, 2025 |
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| Prospectus [Line Items] | ||||||||||
| Fee Waiver or Reimbursement over Assets, Date of Termination | June 30, 2027 | |||||||||
| BlackRock Global Allocation Portfolio | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Management Fees (as a percentage of Assets) | 0.37% | [1] | ||||||||
| Distribution and Service (12b-1) Fees | 0.00% | |||||||||
| Other Expenses (as a percentage of Assets): | 0.56% | [2] | ||||||||
| Acquired Fund Fees and Expenses | 0.03% | |||||||||
| Expenses (as a percentage of Assets) | 0.96% | [3] | ||||||||
| Fee Waiver or Reimbursement | (0.36%) | [1],[4] | ||||||||
| Net Expenses (as a percentage of Assets) | 0.60% | [1],[4] | ||||||||
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