EQUITY INDEX FUND Average Annual Total Returns |
12 Months Ended | 60 Months Ended | 120 Months Ended | ||
|---|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
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| S&P 500® Index (reflects no deduction for fees, expenses or taxes)[Member] | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 17.88% | 14.43% | 14.82% | ||
| Institutional | Return Before Taxes[Member] | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 17.06% | 14.04% | 14.67% | ||
| Investor | After Taxes on Distributions | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | [1] | 16.37% | 12.94% | 13.67% | |
| Investor | After Taxes on Distributions and Sales | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | [1] | 10.17% | 10.83% | 11.89% | |
| Investor | Return Before Taxes[Member] | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 16.78% | 13.74% | 14.36% | ||
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