Label

Element

Value

MM S&P 500 Index Fund

Prospectus [Line Items]

oef_ProspectusLineItems

Risk/Return [Heading]

oef_RiskReturnHeading

MM S&P 500 ® Index Fund

Objective, Primary [Text Block]

oef_ObjectivePrimaryTextBlock

The following information will replace the information for the Fund found in the section titled Investment Objective (on page 17 of the Prospectus):

The Fund seeks to provide investment results that correspond to the total return performance of publicly traded common stocks in the aggregate as represented by the S&P 500® Index.

Strategy Narrative [Text Block]

oef_StrategyNarrativeTextBlock

The reference to “Northern Trust Investments, Inc. (“NTI”)” under the heading Principal Investment Strategies in the section titled Investments, Risks, And Performance (on page 18 of the Prospectus) will be deleted and replaced with a reference to “BlackRock Investment Management, LLC (“BlackRock”)”.

PLEASE RETAIN THIS SUPPLEMENT FOR FUTURE REFERENCE