v3.26.1
Performance Management - Prospectus Summary - Dreyfus Money Market Fund
Nov. 30, 2025
Prospectus [Line Items]  
Bar Chart and Performance Table [Heading] Performance
Performance Narrative [Text Block]

The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the performance of the fund's Premier shares from year to year. The table shows the average annual total returns of the fund's Premier shares over time. The fund's past performance is not necessarily an indication of how the fund will perform in the future. More recent performance information may be available at www.dreyfus.com.
Performance Past Does Not Indicate Future [Text] The fund's past performance is not necessarily an indication of how the fund will perform in the future.
Performance Information Illustrates Variability of Returns [Text] The following bar chart and table provide some indication of the risks of investing in the fund.
Bar Chart [Heading] Year-by-Year Total Returns as of 12/31 each year (%)
Bar Chart Closing [Text Block]

During the periods shown in the chart:
Best Quarter
2023, Q4: 1.35
Worst Quarter
2021, Q4: 0.00
Performance [Table]
Average Annual Total Returns
 12 Months Ended 60 Months Ended 120 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Prospectus Summary | Dreyfus Money Market Fund | Premier Shares | Average Annual Return, Percent 4.26% 3.21% 2.02%
Average Annual Return, Caption [Optional Text] Average Annual Total Returns as of 12/31/25
Performance Table Closing [Text Block] For the fund's current yield for Premier shares, call toll-free 1-800-373-9387 (inside the U.S. only).
Money Market Seven Day Yield Phone 1-800-373-9387
Performance Availability Website Address [Text] www.dreyfus.com
Premier Shares  
Prospectus [Line Items]  
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 1.35%
Highest Quarterly Return, Date Dec. 31, 2023
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return none
Lowest Quarterly Return, Date Dec. 31, 2021
Bar Chart and Performance Table [Heading] Performance
Performance Narrative [Text Block]

The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the performance of the fund's Service shares from year to year. The table shows the average annual total returns of the fund's Service shares over time. The fund's past performance is not necessarily an indication of how the fund will perform in the future. More recent performance information may be available at www.dreyfus.com.
Performance Past Does Not Indicate Future [Text] The fund's past performance is not necessarily an indication of how the fund will perform in the future.
Performance Information Illustrates Variability of Returns [Text] The following bar chart and table provide some indication of the risks of investing in the fund.
Bar Chart [Heading] Year-by-Year Total Returns as of 12/31 each year (%)
Bar Chart Closing [Text Block]

During the periods shown in the chart:
Best Quarter
2023, Q4: 1.16
Worst Quarter
2022, Q1: 0.00
Performance [Table]
Average Annual Total Returns
 12 Months Ended 60 Months Ended 120 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Prospectus Summary | Dreyfus Money Market Fund | Service Shares | Average Annual Return, Percent 3.46% 2.65% 1.60%
Average Annual Return, Caption [Optional Text] Average Annual Total Returns as of 12/31/25
Performance Table Closing [Text Block] For the fund's current yield for Service shares, call toll-free 1-800-373-9387 (inside the U.S. only).
Money Market Seven Day Yield Phone 1-800-373-9387
Performance Availability Website Address [Text] www.dreyfus.com
Service Shares  
Prospectus [Line Items]  
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 1.16%
Highest Quarterly Return, Date Dec. 31, 2023
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return none
Lowest Quarterly Return, Date Mar. 31, 2022
Bar Chart and Performance Table [Heading] Performance
Performance Narrative [Text Block]

The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the performance of the fund's Wealth shares from year to year. The table shows the average annual total returns of the fund's Wealth shares over time. The fund's past performance is not necessarily an indication of how the fund will perform in the future. More recent performance information may be available at www.dreyfus.com.
Performance Past Does Not Indicate Future [Text] The fund's past performance is not necessarily an indication of how the fund will perform in the future.
Performance Information Illustrates Variability of Returns [Text] The following bar chart and table provide some indication of the risks of investing in the fund.
Bar Chart [Heading] Year-by-Year Total Returns as of 12/31 each year (%)
Bar Chart Closing [Text Block]

During the periods shown in the chart:
Best Quarter
2023, Q4: 1.27
Worst Quarter
2022, Q1: 0.00
Performance [Table]
Average Annual Total Returns
 12 Months Ended 60 Months Ended 120 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Prospectus Summary | Dreyfus Money Market Fund | Wealth Shares | Average Annual Return, Percent 3.99% 2.99% 1.84%
Average Annual Return, Caption [Optional Text] Average Annual Total Returns as of 12/31/25
Performance Table Closing [Text Block] For the fund's current yield for Wealth shares, call toll-free 1-800-373-9387 (inside the U.S. only).
Money Market Seven Day Yield Phone 1-800-373-9387
Performance Availability Website Address [Text] www.dreyfus.com
Wealth Shares  
Prospectus [Line Items]  
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 1.27%
Highest Quarterly Return, Date Dec. 31, 2023
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return none
Lowest Quarterly Return, Date Mar. 31, 2022