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Shareholder Report
 12 Months Ended
Jun. 30, 2024
USD ($)
$ / shares
Shareholder Report [Line Items]  
Document Type N-CSR
Amendment Flag false
Registrant Name The Money Market Portfolios
Entity Central Index Key 0000890089
Entity Investment Company Type N-1A
Document Period End Date Jun. 30, 2024
Class A  
Shareholder Report [Line Items]  
Fund Name The U.S. Government Money Market Portfolio
Class Name Class A
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about The U.S. Government Money Market Portfolio for the period July 1, 2023, to June 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-masterfunds-documents. You can also request this information by contacting us at (800) DIAL BEN/342-5236.
Additional Information Phone Number (800) DIAL BEN/342-5236
Additional Information Website https://www.franklintempleton.com/regulatory-masterfunds-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
$15
0.15%
Expenses Paid, Amount $ 15
Expense Ratio, Percent 0.15%
Net Assets $ 11,497,744,717
Holdings Count | $ / shares 88
Advisory Fees Paid, Amount $ 15,854,804
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of June 30, 2024)
Total Net Assets
$11,497,744,717
Total Number of Portfolio Holdings
88
Total Management Fee Paid
$15,854,804
Holdings [Text Block]
image
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-masterfunds-documents