S000016937 [Member] Expense Example, No Redemption - ClearBridge Variable Mid Cap Portfolio |
Dec. 31, 2025
USD ($)
|
|---|---|
| Class I | |
| Prospectus [Line Items] | |
| Expense Example, No Redemption, 1 Year | $ 84 |
| Expense Example, No Redemption, 3 Years | 262 |
| Expense Example, No Redemption, 5 Years | 456 |
| Expense Example, No Redemption, 10 Years | 1,015 |
| Class II | |
| Prospectus [Line Items] | |
| Expense Example, No Redemption, 1 Year | 109 |
| Expense Example, No Redemption, 3 Years | 340 |
| Expense Example, No Redemption, 5 Years | 589 |
| Expense Example, No Redemption, 10 Years | $ 1,304 |