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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock
Supplement to the
Fidelity® Government Cash Reserves
January 29, 2024
Prospectus
The following information replaces similar information found in the “Fund Summary” section under the “Principal Investment Risks” heading.
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 a bank account and 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, 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.
The fund will not impose a fee upon the sale of your shares.
Effective March 1, 2024, the fund’s management contract was amended to incorporate administrative services previously covered under separate services agreements. The amended contract incorporates a basic fee rate that may vary by class (subject to an income component). The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class’s management fee.
The following information replaces similar information found in the “Fund Summary” section under the “Fee Table” heading.
Annual Operating Expenses
(expenses that you pay each year as a % of the value of your investment)
Management fee
  0.38%A,B
Distribution and/or Service (12b‑1) fees
  None
Other expenses
  0.00%B
 
 
Total annual operating expenses
  0.38%
A The management fee covers administrative services previously provided under separate services agreements with the fund, for which 0.19% was previously charged under the services agreements.
B Adjusted to reflect current fees.
1 year
  $39
3 years
  $122 
5 years
  $213
10 years
  $480
Fidelity Government Cash Reserves  
Risk/Return: rr_RiskReturnAbstract  
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock
Supplement to the
Fidelity® Government Cash Reserves
January 29, 2024
Prospectus
The following information replaces similar information found in the “Fund Summary” section under the “Principal Investment Risks” heading.
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 a bank account and 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, 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.
The fund will not impose a fee upon the sale of your shares.
Effective March 1, 2024, the fund’s management contract was amended to incorporate administrative services previously covered under separate services agreements. The amended contract incorporates a basic fee rate that may vary by class (subject to an income component). The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class’s management fee.
The following information replaces similar information found in the “Fund Summary” section under the “Fee Table” heading.
Annual Operating Expenses
(expenses that you pay each year as a % of the value of your investment)
Management fee
  0.38%A,B
Distribution and/or Service (12b‑1) fees
  None
Other expenses
  0.00%B
 
 
Total annual operating expenses
  0.38%
A The management fee covers administrative services previously provided under separate services agreements with the fund, for which 0.19% was previously charged under the services agreements.
B Adjusted to reflect current fees.
1 year
  $39
3 years
  $122 
5 years
  $213
10 years
  $480
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Operating Expenses (expenses that you pay each year as a % of the value of your investment)
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Adjusted to reflect current fees.
Fidelity Government Cash Reserves | Risk Lose Money [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock You could lose money by investing in the fund.
Fidelity Government Cash Reserves | Risk Money Market Fund May Not Preserve Dollar [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Although the fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so.
Fidelity Government Cash Reserves | Risk Money Market Fund Sponsor May Not Provide Support [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock 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.
Fidelity Government Cash Reserves | Risk Not Insured Depository Institution [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock 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.
Fidelity Government Cash Reserves | Fidelity Government Cash Reserves  
Risk/Return: rr_RiskReturnAbstract  
Management fee rr_ManagementFeesOverAssets 0.38% [1],[2]
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets none [1]
Total annual operating expenses rr_ExpensesOverAssets 0.38%
1 year rr_ExpenseExampleYear01 $ 39
3 years rr_ExpenseExampleYear03 122
5 years rr_ExpenseExampleYear05 213
10 years rr_ExpenseExampleYear10 $ 480
[1] Adjusted to reflect current fees.
[2] The management fee covers administrative services previously provided under separate services agreements with the fund, for which 0.19% was previously charged under the services agreements.