Index 400 Stock Portfolio Average Annual Total Returns |
12 Months Ended | 60 Months Ended | 120 Months Ended |
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
|
| S&P MidCap 400® Index(reflects no deduction for fees, expenses or taxes)[Member] | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 7.50% | 9.12% | 10.72% |
| S&P 500® Index(reflects no deduction for fees, expenses or taxes)[Member] | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 17.88% | 14.42% | 14.82% |
| Index 400 Stock Portfolio | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 7.24% | 8.85% | 10.44% |