Shareholder Report |
6 Months Ended | |||||||||||||||||||||
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Jun. 30, 2025
USD ($)
Holding
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Shareholder Report [Line Items] | ||||||||||||||||||||||
Document Type | N-CSRS | |||||||||||||||||||||
Amendment Flag | false | |||||||||||||||||||||
Registrant Name | SEQUOIA FUND INC | |||||||||||||||||||||
Entity Central Index Key | 0000089043 | |||||||||||||||||||||
Entity Investment Company Type | N-1A | |||||||||||||||||||||
Document Period End Date | Jun. 30, 2025 | |||||||||||||||||||||
C000033159 [Member] | ||||||||||||||||||||||
Shareholder Report [Line Items] | ||||||||||||||||||||||
Fund Name | Sequoia Fund, Inc. | |||||||||||||||||||||
Class Name | Sequoia Fund, Inc. | |||||||||||||||||||||
Trading Symbol | SEQUX | |||||||||||||||||||||
Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Sequoia Fund, Inc. (the “Fund”) for the period of January 1, 2025 to June 30, 2025. | |||||||||||||||||||||
Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |||||||||||||||||||||
Additional Information [Text Block] | You can find additional information about the Fund at www.sequoiafund.com/resources. You can also request this information by contacting us at 1-800-686-6884. | |||||||||||||||||||||
Additional Information Phone Number | 1-800-686-6884 | |||||||||||||||||||||
Additional Information Website | www.sequoiafund.com/resources | |||||||||||||||||||||
Expenses [Text Block] | Fund Expenses (Based on a hypothetical $10,000 investment)
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Expenses Paid, Amount | $ 54 | |||||||||||||||||||||
Expense Ratio, Percent | 1.00% | [1] | ||||||||||||||||||||
Net Assets | $ 3,895,115,489 | |||||||||||||||||||||
Holdings Count | Holding | 24 | |||||||||||||||||||||
Investment Company Portfolio Turnover | 5.00% | |||||||||||||||||||||
Additional Fund Statistics [Text Block] | Key Fund Statistics
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Holdings [Text Block] | Fund Holdings (as of June 30, 2025) The following table and graph show the investment makeup of the Fund as of June 30, 2025. Figures are expressed as percentages of the Fund’s net assets. Top Ten Holdings
Sector Allocation ![]() |
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Largest Holdings [Text Block] | Top Ten Holdings
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