Average Annual Total Returns |
12 Months Ended | 60 Months Ended | 120 Months Ended |
|---|---|---|---|
Dec. 31, 2024 |
Dec. 31, 2024 |
Dec. 31, 2024 |
|
| SEQUOIA FUND INC | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 20.79% | 10.67% | 8.02% |
| SEQUOIA FUND INC | After Taxes on Distributions | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 19.43% | 8.89% | 5.53% |
| SEQUOIA FUND INC | After Taxes on Distributions and Sales | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 13.28% | 8.24% | 5.69% |
| S&P 500 Index (reflects no deduction for fees, expenses or taxes) | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 25.02% | 14.51% | 13.09% |