S000003874 [Member] Average Annual Total Returns |
12 Months Ended | 60 Months Ended | 120 Months Ended |
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
|
| MSCI All Country World Index-NR (index reflects no deduction for fees, expenses or taxes but are net of dividend tax withholding) | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 22.34% | 11.19% | 11.72% |
| MSCI World Health Care Index-NR (index reflects no deduction for fees, expenses or taxes but are net of dividend tax withholding) | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 14.83% | 6.43% | 8.14% |
| Class IA Shares | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 15.34% | 7.99% | 8.63% |
| Class IB Shares | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 15.05% | 7.71% | 8.36% |