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Label Element Value
Class A Prospectus | GENERAL GOVERNMENT SECURITIES MONEY MARKET FUNDS, INC. | General Government Securities Money Market Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] ck0000353560_SupplementTextBlock

May 31, 2019


General Money Funds


General Government Securities Money Market Fund


Class A Shares


Supplement to Current Summary Prospectus and Prospectus


Effective May 31, 2019 (the "Effective Date"), the following information supersedes and replaces any contrary information contained in the section of the funds' summary prospectus and prospectus entitled "Fees and Expenses":

Risk/Return [Heading] rr_RiskReturnHeading General Government Securities Money Market Fund
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold shares of the fund.

Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Restated to reflect current fees.
Class A Prospectus | GENERAL GOVERNMENT SECURITIES MONEY MARKET FUNDS, INC. | General Government Securities Money Market Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Management fees rr_ManagementFeesOverAssets 0.50%
Shareholder services fees rr_Component1OtherExpensesOverAssets 0.25% [1]
Miscellaneous other expenses rr_Component2OtherExpensesOverAssets 0.12%
Other expenses rr_OtherExpensesOverAssets 0.37%
Total annual fund operating expenses rr_ExpensesOverAssets 0.87%
[1] Restated to reflect current fees.