Other Expenses Interest Expense [Member] Expense Example - Overlay B Portfolio |
Sep. 30, 2025
USD ($)
|
|---|---|
| Class 1 | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | $ 97 |
| Expense Example, with Redemption, 3 Years | 313 |
| Expense Example, with Redemption, 5 Years | 548 |
| Expense Example, with Redemption, 10 Years | 1,220 |
| Class 2 | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 83 |
| Expense Example, with Redemption, 3 Years | 269 |
| Expense Example, with Redemption, 5 Years | 472 |
| Expense Example, with Redemption, 10 Years | $ 1,056 |