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Shareholder Report
 12 Months Ended
Sep. 30, 2024
USD ($)
$ / shares
Shareholder Report [Line Items]  
Document Type N-CSR
Amendment Flag false
Registrant Name PUTNAM MONEY MARKET FUND
Entity Central Index Key 0000081248
Entity Investment Company Type N-1A
Document Period End Date Sep. 30, 2024
Class A  
Shareholder Report [Line Items]  
Fund Name Putnam Money Market Fund
Class Name Class A
Trading Symbol PDDXX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Putnam Money Market Fund for the period October 1, 2023, to September 30, 2024.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents. You can also request this information by contacting us at (800) 225-1581.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number (800) 225-1581
Additional Information Website https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class A
$46
0.45%
Expenses Paid, Amount $ 46
Expense Ratio, Percent 0.45%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE?
As of September 30, 2024, the seven-day current yield for Class A shares of the Putnam Money Market Fund was 4.62% and the seven-day effective yield was 4.62%. The seven-day current yield represents net interest income generated by the Fund’s investments for the past seven days and assumes income is generated each week over a 365-day period. The seven-day effective yield assumes reinvestment of the coupon (interest payments) and will typically be slightly higher than the current yield because of the compounding effect on investment returns.
The Fund has maintained a shorter weighted average maturity (WAM) posture due to our view that the U.S. Federal Reserve (Fed) rate cutting cycle will be slower and shallower relative to market expectations. As a result, the Fund has focused on owning secured overnight financing rate (SOFR)-based floating-rate securities as spreads are more favorable relative to fixed rate, in our view. We selectively purchased fixed-rate commercial paper and certificates of deposit in the six-month to one-year range when interest rates reached levels that offered enough positive carry against shorter-dated paper. We continued to like asset-backed commercial paper backed by what we believe are diverse, high-quality financial assets, such as trade receivables and consumer loans.
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.
Material Change Date Oct. 01, 2023
Updated Performance Information Location [Text Block]
For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/money-market-funds.
Net Assets $ 895,230,118
Holdings Count | $ / shares 66 [1]
Advisory Fees Paid, Amount $ 2,329,592
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of September 30, 2024)
Total Net Assets
$895,230,118
Total Number of Portfolio Holdings*
66
Total Management Fee Paid
$2,329,592
[1]
Holdings [Text Block]
image
 [2]
Material Fund Change [Text Block]
HOW HAS THE FUND CHANGED?
On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes.
Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement.
Effective October 2, 2023, pursuant to amendments to Rule 2a-7 under the Investment Company Act of 1940, as amended, the Fund may no longer impose a redemption gate and the application of liquidity fees, if any, is no longer tied to the Fund’s weekly liquid assets.
This is a summary of certain changes to the Fund since October 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements and the Fund’s next prospectus, which we expect to be available by February 1, 2025, at https://www.franklintempleton.com/regulatory-fund-documents or upon request at (800) 225-1581 or       
funddocuments@putnam.com.
Updated Prospectus Phone Number (800) 225-1581
Updated Prospectus Email Address funddocuments@putnam.com
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class C  
Shareholder Report [Line Items]  
Fund Name Putnam Money Market Fund
Class Name Class C
Trading Symbol PFCXX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Putnam Money Market Fund for the period October 1, 2023, to September 30, 2024.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents. You can also request this information by contacting us at (800) 225-1581.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number (800) 225-1581
Additional Information Website https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class C
$46
0.45%
Expenses Paid, Amount $ 46
Expense Ratio, Percent 0.45%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE?
As of September 30, 2024, the seven-day current yield for Class C shares of the Putnam Money Market Fund was 4.62% and the seven-day effective yield was 4.62%. The seven-day current yield represents net interest income generated by the Fund’s investments for the past seven days and assumes income is generated each week over a 365-day period. The seven-day effective yield assumes reinvestment of the coupon (interest payments) and will typically be slightly higher than the current yield because of the compounding effect on investment returns.
The Fund has maintained a shorter weighted average maturity (WAM) posture due to our view that the U.S. Federal Reserve (Fed) rate cutting cycle will be slower and shallower relative to market expectations. As a result, the Fund has focused on owning secured overnight financing rate (SOFR)-based floating-rate securities as spreads are more favorable relative to fixed rate, in our view. We selectively purchased fixed-rate commercial paper and certificates of deposit in the six-month to one-year range when interest rates reached levels that offered enough positive carry against shorter-dated paper. We continued to like asset-backed commercial paper backed by what we believe are diverse, high-quality financial assets, such as trade receivables and consumer loans.
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.
Material Change Date Oct. 01, 2023
Updated Performance Information Location [Text Block]
For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/money-market-funds.
Net Assets $ 895,230,118
Holdings Count | $ / shares 66 [3]
Advisory Fees Paid, Amount $ 2,329,592
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of September 30, 2024)
Total Net Assets
$895,230,118
Total Number of Portfolio Holdings*
66
Total Management Fee Paid
$2,329,592
[3]
Holdings [Text Block]
image
 [4]
Material Fund Change [Text Block]
HOW HAS THE FUND CHANGED?
On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes.
Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement.
Effective October 2, 2023, pursuant to amendments to Rule 2a-7 under the Investment Company Act of 1940, as amended, the Fund may no longer impose a redemption gate and the application of liquidity fees, if any, is no longer tied to the Fund’s weekly liquid assets.
This is a summary of certain changes to the Fund since October 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements and the Fund’s next prospectus, which we expect to be available by February 1, 2025, at https://www.franklintempleton.com/regulatory-fund-documents or upon request at (800) 225-1581 or       
funddocuments@putnam.com.
Updated Prospectus Phone Number (800) 225-1581
Updated Prospectus Email Address funddocuments@putnam.com
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
Class R  
Shareholder Report [Line Items]  
Fund Name Putnam Money Market Fund
Class Name Class R
Trading Symbol PURXX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about Putnam Money Market Fund for the period October 1, 2023, to September 30, 2024.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents. You can also request this information by contacting us at (800) 225-1581.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number (800) 225-1581
Additional Information Website https://www.franklintempleton.com/regulatory-fund-documents
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class R
$46
0.45%
Expenses Paid, Amount $ 46
Expense Ratio, Percent 0.45%
Factors Affecting Performance [Text Block]
HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE?
As of September 30, 2024, the seven-day current yield for Class R shares of the Putnam Money Market Fund was 4.62% and the seven-day effective yield was 4.62%. The seven-day current yield represents net interest income generated by the Fund’s investments for the past seven days and assumes income is generated each week over a 365-day period. The seven-day effective yield assumes reinvestment of the coupon (interest payments) and will typically be slightly higher than the current yield because of the compounding effect on investment returns.
The Fund has maintained a shorter weighted average maturity (WAM) posture due to our view that the U.S. Federal Reserve (Fed) rate cutting cycle will be slower and shallower relative to market expectations. As a result, the Fund has focused on owning secured overnight financing rate (SOFR)-based floating-rate securities as spreads are more favorable relative to fixed rate, in our view. We selectively purchased fixed-rate commercial paper and certificates of deposit in the six-month to one-year range when interest rates reached levels that offered enough positive carry against shorter-dated paper. We continued to like asset-backed commercial paper backed by what we believe are diverse, high-quality financial assets, such as trade receivables and consumer loans.
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.
Material Change Date Oct. 01, 2023
Updated Performance Information Location [Text Block]
For current month-end performance, please call Franklin Templeton at (800) 225-1581 or visit https://www.franklintempleton.com/investments/options/money-market-funds.
Net Assets $ 895,230,118
Holdings Count | $ / shares 66 [5]
Advisory Fees Paid, Amount $ 2,329,592
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of September 30, 2024)
Total Net Assets
$895,230,118
Total Number of Portfolio Holdings*
66
Total Management Fee Paid
$2,329,592
[5]
Holdings [Text Block]
image
 [6]
Material Fund Change [Text Block]
HOW HAS THE FUND CHANGED?
On May 31, 2023, Franklin Resources, Inc. (“Franklin Resources”) and Great-West Lifeco Inc., the parent company of Putnam U.S. Holdings I, LLC (“Putnam Holdings”), announced that they had entered into a definitive agreement for a subsidiary of Franklin Resources to acquire Putnam Holdings in a stock and cash transaction (the “Transaction”). The Transaction was completed on January 1, 2024. As part of the Transaction, your Fund’s then-current investment advisor, Putnam Investment Management, LLC (“Putnam Management”), a wholly-owned subsidiary of Putnam Holdings, and your Fund’s sub-advisor, Putnam Investments Limited (“PIL”), an indirect, wholly-owned subsidiary of Putnam Holdings, became indirect, wholly-owned subsidiaries of Franklin Resources. In connection with the Transaction, shareholders of your Fund approved a new management contract with Putnam Management and a new sub-advisory contract with PIL. The new contracts are identical to the previous contracts, except for the effective dates, initial terms, updates to fund names as necessary to reflect previous name changes, and certain non-substantive changes.
Effective July 15, 2024, Putnam Management transferred its management contract for your Fund to Franklin Advisers, Inc. (“Franklin Advisers”), and Franklin Advisers replaced Putnam Management as the investment advisor to your Fund. In connection with the transfer, your Fund’s portfolio managers, along with supporting research analysts and certain other investment staff of Putnam Management, also became employees of Franklin Advisers. Putnam Management also transferred to Franklin Advisers its sub-management agreement with PIL in respect of your Fund. Franklin Advisers is an indirect, wholly-owned subsidiary of Franklin Resources. In addition, effective July 15, 2024, Franklin Advisers retained Putnam Management as a sub-advisor to your Fund pursuant to a new subadvisory agreement.
Effective October 2, 2023, pursuant to amendments to Rule 2a-7 under the Investment Company Act of 1940, as amended, the Fund may no longer impose a redemption gate and the application of liquidity fees, if any, is no longer tied to the Fund’s weekly liquid assets.
This is a summary of certain changes to the Fund since October 1, 2023. For more complete information, you may review the Fund’s current prospectus and any applicable supplements and the Fund’s next prospectus, which we expect to be available by February 1, 2025, at https://www.franklintempleton.com/regulatory-fund-documents or upon request at (800) 225-1581 or       
funddocuments@putnam.com.
Updated Prospectus Phone Number (800) 225-1581
Updated Prospectus Email Address funddocuments@putnam.com
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
[1]
* Includes derivatives, if applicable.
[2]
Cash and Equivalents, if any, represent the market value weights of cash and other unclassified assets in the portfolio and may show a negative market value percentage as a result of the timing of trade-date and settlement-date transactions. Holdings and allocations may vary over time.
[3]
* Includes derivatives, if applicable.
[4]
Cash and Equivalents, if any, represent the market value weights of cash and other unclassified assets in the portfolio and may show a negative market value percentage as a result of the timing of trade-date and settlement-date transactions. Holdings and allocations may vary over time.
[5]
* Includes derivatives, if applicable.
[6]
Cash and Equivalents, if any, represent the market value weights of cash and other unclassified assets in the portfolio and may show a negative market value percentage as a result of the timing of trade-date and settlement-date transactions. Holdings and allocations may vary over time.