0000702149 2023-08-29 2023-08-29 0000702149 fmr:NCCMTGovernmentPortfolio-PROStandAloneMember fmr:S000007506Member 2023-08-29 2023-08-29 0000702149 fmr:NCCMTGovernmentPortfolio-PROStandAloneMember fmr:S000007506Member fmr:C000020486Member 2023-08-29 2023-08-29 0000702149 fmr:NCCMTGovernmentPortfolio-PROStandAloneMember fmr:S000007506Member fmr:ReturnBeforeTaxesMember fmr:C000020486Member 2023-08-29 2023-08-29 iso4217:USD pure 485BPOS 2023-06-30 false 0000702149 N-1A The North Carolina Capital Management Trust Fund Summary Fund: Government Portfolio Investment Objective Government Portfolio seeks to obtain as high a level of current income as is consistent with the preservation of capital and liquidity and to maintain a constant net asset value of $1.00 per share. Fee Table The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. In addition to the fees and expenses described below, you may pay other fees, such as fees to financial intermediaries. Shareholder fees 0 Annual Operating Expenses 0.00140 0.00065 0.00002 0.00207 -0.00065 0.00142 2027-10-31 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: 15 46 86 233 Principal Investment Strategies Normally investing at least 99.5% of total assets in cash, U.S. Government securities and/or repurchase agreements that are collateralized fully (i.e., collateralized by cash or government securities), as permitted by North Carolina General Statute 159-30, as amended (the Statute) and 20 North Carolina Administrative Code 3.0703, and, upon effectiveness, 20 North Carolina Administrative Code 3.0712, as amended (the Code).Investing in U.S. Government securities issued by entities that are chartered or sponsored by Congress but whose securities are neither issued nor guaranteed by the U.S. Treasury.Investing in compliance with industry-standard regulatory requirements for money market funds for the quality, maturity, liquidity, and diversification of investments.Investing only in securities that are authorized for investment by units of local governments pursuant to North Carolina General Statute 159-30(c)(8) and, upon effectiveness, 20 North Carolina Administrative Code 3.0712. In addition, the fund normally invests at least 80% of its assets in U.S. Government securities and repurchase agreements for those securities. Principal Investment Risks Interest Rate Changes. Interest rate increases can cause the price of a money market security to decrease. Income Risk. A low or negative interest rate environment can adversely affect the fund's yield. Issuer-Specific Changes. A decline in the credit quality of an issuer or a provider of credit support or a maturity-shortening structure for a security can cause the price of a money market security to decrease. You could lose money by investing in the fund. Although the fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so. An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.  Fidelity Investments and its affiliates, the fund's sponsor, have no legal obligation to provide financial support to the fund, and you should not expect that the sponsor will provide financial support to the fund at any time. The fund will not impose a fee upon the sale of your shares, nor temporarily suspend your ability to sell shares if the fund's weekly liquid assets fall below 30% of its total assets because of market conditions or other factors. You could lose money by investing in the fund. Although the fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so. An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.  Fidelity Investments and its affiliates, the fund's sponsor, have no legal obligation to provide financial support to the fund, and you should not expect that the sponsor will provide financial support to the fund at any time. Performance The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year. Past performance is not an indication of future performance. The information illustrates the changes in the performance of the fund's shares from year to year. Past performance is not an indication of future performance. Year-by-Year Returns 0.0002 0.0001 0.0006 0.0032 0.0074 0.0172 0.0208 0.0039 0.0001 0.0155    Highest Quarter Return 0.0087 2022-12-31    Lowest Quarter Return 0.0000 2014-03-31    Year-to-Date Return 0.0233 2023-06-30 Average Annual Returns Government Portfolio 0.0155 0.0114 0.0069 ANet rate retained by Fidelity Management & Research Company LLC (FMR) after payment of 12b-1 fees to the distributor. BFidelity Management & Research Company LLC (FMR) has contractually agreed to reimburse the fund to the extent that total operating expenses (excluding interest, certain taxes, fees and expenses of the Independent Trustees, extraordinary expenses, and acquired fund fees and expenses (including fees and expenses associated with a wholly owned subsidiary), if any, as well as non-operating expenses such as brokerage commissions and fees and expenses associated with the fund's securities lending program, if applicable), as a percentage of its average net assets, exceed 0.14% (the Expense Cap). If at any time during the current fiscal year expenses for the fund fall below the Expense Cap, FMR reserves the right to recoup through the end of the fiscal year any expenses that were reimbursed during the current fiscal year up to, but not in excess of, the Expense Cap. This arrangement will remain in effect through October 31, 2027. FMR may not terminate this arrangement before the expiration date without the approval of the Board of Trustees and may extend it in its discretion after that date.