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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName Fidelity Phillips Street Trust
Prospectus Date rr_ProspectusDate Jan. 29, 2016
11.30 Fidelity Government Cash Reserves PRO-03 | Fidelity® Government Cash Reserves  
Risk/Return: rr_RiskReturnAbstract  
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
  • Investing in compliance with industry-standard regulatory requirements for money market funds for the quality, maturity, liquidity, and diversification of investments.
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

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.

Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution 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.