S000006018 [Member] Expense Example, No Redemption - Versatile Bond Portfolio - Class C |
Jan. 31, 2026
USD ($)
|
|---|---|
| Prospectus [Line Items] | |
| Expense Example, No Redemption, 1 Year | $ 169 |
| Expense Example, No Redemption, 3 Years | 643 |
| Expense Example, No Redemption, 5 Years | 1,144 |
| Expense Example, No Redemption, 10 Years | $ 2,521 |