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Shareholder Report
 6 Months Ended
May 31, 2024
USD ($)
shares
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name Fidelity Phillips Street Trust
Entity Central Index Key 0000278001
Entity Investment Company Type N-1A
Document Period End Date May 31, 2024
Fidelity Government Cash Reserves  
Shareholder Report [Line Items]  
Fund Name Fidelity® Government Cash Reserves
Class Name Fidelity® Government Cash Reserves
Trading Symbol FDRXX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Government Cash Reserves for the period December 1, 2023 to May 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-800-544-8544
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Fidelity® Government Cash Reserves
$ 20 
0.40%
 
  
Expenses Paid, Amount $ 20
Expense Ratio, Percent 0.40%
Net Assets $ 218,855,553,492
Holdings Count | shares 464
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of May 31, 2024)
 
KEY FACTS 
  
  
Fund Size
$218,855,553,492
 
  
Number of Holdings
464
 
  
Holdings [Text Block]   EFFECTIVE MATURITY DIVERSIFICATION (% of Fund's net assets)   Days   1-7 63.1   8-30 7.5   31-60 13.2   61-90 6.3   91-180 8.1   >180 3.6         Repurchase Agreements 44.6 U.S. Treasury Obligations 31.6 U.S. Government Agency - Debt 25.6 ASSET ALLOCATION (% of Fund's net assets) Net Other Assets (Liabilities) - (1.8)%