Average Annual Total Returns |
12 Months Ended | 60 Months Ended | 120 Months Ended |
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
|
| SEQUOIA FUND INC | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 22.13% | 10.46% | 11.04% |
| SEQUOIA FUND INC | After Taxes on Distributions | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 19.30% | 8.84% | 8.36% |
| SEQUOIA FUND INC | After Taxes on Distributions and Sales | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 14.83% | 8.04% | 8.10% |
| S&P 500 Index (reflects no deduction for fees, expenses or taxes) | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 17.88% | 14.42% | 14.82% |