v3.24.4
Risk/Return Summary - FidelityGovernmentCashReserves-RetailPRO - FidelityGovernmentCashReserves-RetailPRO - Fidelity Government Cash Reserves
Jan. 29, 2025
Risk Lose Money [Text]  
Prospectus Line Items  
Risk Text Block You could lose money by investing in the fund .
Risk Money Market Fund May Not Preserve Dollar [Text]  
Prospectus Line Items  
Risk Text Block Although the fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so .
Risk Money Market Fund Sponsor May Not Provide Support [Text]  
Prospectus Line Items  
Risk Text Block   Fidelity   Investments and its affiliates, the fund's sponsor, is not required to reimburse the fund for losses , and you should not expect that the sponsor will provide financial support to the fund at any time , including during periods of market stress .
Risk Not Insured Depository Institution [Text]  
Prospectus Line Items  
Risk Text Block An investment in the fund is not a bank account and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency .
InterestRateChangesMember  
Prospectus Line Items  
Risk Text Block Interest Rate Changes. Interest rate increases can cause the price of a money market security to decrease.
IncomeRiskMember  
Prospectus Line Items  
Risk Text Block Income Risk. A low or negative interest rate environment can adversely affect the fund's yield.
IssuerSpecificChangesMember  
Prospectus Line Items  
Risk Text Block Issuer-Specific Changes. A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a money market security to decrease.