Other Expenses Interest Expense [Member] Expense Example - Tax-Aware Overlay B Portfolio |
Sep. 30, 2025
USD ($)
|
|---|---|
| Class 1 | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | $ 93 |
| Expense Example, with Redemption, 3 Years | 292 |
| Expense Example, with Redemption, 5 Years | 508 |
| Expense Example, with Redemption, 10 Years | 1,130 |
| Class 2 | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 79 |
| Expense Example, with Redemption, 3 Years | 248 |
| Expense Example, with Redemption, 5 Years | 432 |
| Expense Example, with Redemption, 10 Years | $ 965 |