S000003866 [Member] Average Annual Total Returns |
12 Months Ended | 60 Months Ended | 120 Months Ended |
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
|
| FTSE World Index (Reflects no deduction for fees, expenses or taxes) | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 23.48% | 12.52% | 12.67% |
| Reference Benchmark (Reflects no deduction for fees, expenses or taxes) | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 17.78% | 6.68% | 8.09% |
| BlackRock Global Allocation Portfolio | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 19.61% | 5.98% | 7.73% |