Fees and Expenses - Fidelity Reserves Digital Fund |
Oct. 31, 2025 |
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| Prospectus [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Heading [Optional Text] | Fee Table | |||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Narrative [Text Block] | The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
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| Other Expenses, New Fund, Based on Estimates [Text] | Based on estimated amounts for the current fiscal year. | |||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Fees Caption [Optional Text] | Shareholder fees (fees paid directly from your investment) | |||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Fees [Table] |
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| Operating Expenses Caption [Optional Text] | Annual Operating Expenses (expenses that you pay each year as a % of the value of your investment) | |||||||||||||||||||||||||||||||||||||||||||||||||
| Annual Fund Operating Expenses [Table] |
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| Expense Example Narrative [Text Block] | This example helps compare the cost of investing in the fund with the cost of investing in other funds. Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:
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| Expense Example, With Redemption [Table] |
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