Daily Income Fund Investment Risks - Daily Income Fund	Dec. 31, 2024
Market Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Market Risk The risk that markets will perform poorly or that the returns from the securities in which the Fund invests will underperform returns from the general securities markets or other types of investments. Markets may experience periods of high volatility and reduced liquidity in response to governmental actions or intervention, political, economic or market developments, or other external factors, such as outbreaks of infectious illnesses or other widespread public health issues, outbreaks of war or sanctions in response to military incursions and natural disasters such as floods, droughts, fires, extreme storms, earthquakes or volcanic eruptions. During those periods, the Fund may experience high levels of shareholder redemptions, and may have to sell securities at times when the Fund would otherwise not do so, and potentially at unfavorable prices. Certain securities may be difficult to value during such periods. These risks may be heightened for fixed income securities in low interest rate environments.
Money Market Securities Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Money Market Securities Risk The value of a money market instrument typically will decline during periods of rising interest rates, and can also decline in response to changes in the financial condition of the issuer, borrower, counterparty, or underlying collateral assets, or changes in market, economic, industry, political, and regulatory conditions affecting a particular type of security or issuer or fixed income securities generally. Money market funds are not designed to offer capital appreciation. Certain money market funds in which the Fund may invest may impose a fee upon the sale of shares which may adversely affect the Fund’s returns or liquidity.
Credit Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Credit risk: The risk that an issuer or counterparty will fail to pay its obligations to the Fund when they are due. As a result, the Fund’s income might be reduced, the value of the Fund’s investment might fall, and/or the Fund could lose the entire amount of its investment. Changes in the financial condition of an issuer or counterparty, changes in specific economic, social or political conditions that affect a particular type of security or other instrument or an issuer, and changes in economic, social or political conditions generally can increase the risk of default by an issuer or counterparty, which can affect a security’s or other instrument’s credit quality or value and an issuer’s or counterparty’s ability to pay interest and principal when due.
Income Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Income Risk:  The risk that the value of the Fund’s fixed-income investments may be adversely affected by changes in interest rates and/or inflation. The value of the fund’s investments may decline due to falling or rising interest rates or other factors. In a rising interest rate environment, investors in fixed income securities may leave the fixed income investment market on a large scale, which could adversely affect the price of the fixed-income securities and reduce their liquidity. Increased redemption requests may force the fund to liquidate investments when it is not advantageous to do so. Issuers of securities held by the Fund may call or redeem the securities during periods of falling interest rates, and the Fund would likely be required to reinvest in securities paying lower interest rates. During market conditions in which short-term interest rates are at low levels it is possible that the Fund will generate an insufficient amount of income to pay its expenses, and that it will not be able to pay a daily dividend and may have a negative yield (i.e., it may lose money on an operating basis). It is possible that the Fund would, during these conditions, maintain a substantial portion of its assets in cash, on which it may earn little, if any, income. If an obligation held by the Fund is prepaid, the Fund may have to reinvest the prepayment in other obligations paying income at lower rates.
Interest Rate Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Interest rate risk: The risk that debt instruments will change in value because of actual or expected changes in interest rates. The value of an instrument with a longer duration (whether positive or negative) will be more sensitive to changes in interest rates than a similar instrument with a shorter duration. Bonds and other debt instruments typically have a positive duration, which means the value of the instrument will generally decline if interest rates increase. The value of debt instruments will also generally decline if inflation increases because the purchasing power of the future income and repaid principal is expected to be worth less when received by the Fund. Inflation rates may change frequently and significantly as a result of changes in the domestic or global economy or changes in fiscal or monetary policies.
Investing in the United States Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Investing in the United States Risk A decrease in imports or exports, changes in trade regulations, tariffs, inflation and/or an economic recession in the United States may have a material adverse effect on the U.S. economy and the securities listed on U.S. exchanges. Proposed and adopted policy and legislative changes in the United States are changing many aspects of financial, commercial, public health, environmental, and other regulation and may have a significant effect on U.S. markets generally, as well as on the value of certain securities. Governmental agencies project that the United States will continue to maintain elevated public debt levels for the foreseeable future. Although elevated debt levels do not necessarily indicate or cause economic problems, elevated public debt service costs may constrain future economic growth.The United States has developed increasingly strained relations with a number of foreign countries. If relations with certain countries deteriorate, it could adversely affect U.S. issuers as well as non-U.S. issuers that rely on the United States for trade. The United States has also experienced increased internal political instability. If these trends were to continue, it may have an adverse impact on the U.S. economy and the issuers in which the Fund invests.
US Government Securities Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	U.S. Government Securities Risk The risk that the value of U.S. Government securities can decrease due to changes in interest rates, statutory debt limit negotiations, default or changes to the financial condition or credit rating of the U.S. Government.
Money Market Fund Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Money Market Fund RiskYou could lose money investing in the Fund.Although the Fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it. The share price of money market funds can fall below the $1.00 share price.The Fund’s sponsor is not required to reimburse the Fund for losses, and you should not rely on or expect that the sponsor will enter into support agreements or take other actions to provide financial support to the Fund or maintain the Fund’s $1.00 share price at any time, including during periods of market stress. The credit quality of the Fund’s holdings can change rapidly in certain markets, and the default of a single holding could have an adverse impact on the Fund’s share price. The Fund’s share price can also be negatively affected during periods of high redemption pressures, illiquid markets, and/or significant market volatility.
Yield Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Yield Risk The Fund’s yield will vary as the short-term securities in its portfolio mature or are sold and the proceeds are reinvested in other securities. When interest rates are very low or negative, the Fund may not be able to maintain a positive yield or pay Fund expenses out of current income without impairing the Fund’s ability to maintain a stable net asset value. Additionally, inflation may outpace and diminish investment returns over time. Recent and potential future changes in monetary policy made by central banks and/or their governments may affect interest rates.
Repurchase Agreements Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Repurchase Agreements Risk The Fund’s investment return on repurchase agreements will depend on the counterparty’s willingness and ability to perform its obligations under a repurchase agreement. If the Fund’s counterparty should default on its obligations, becomes subject to a bankruptcy or other insolvency proceeding or if the value of the collateral is insufficient, the Fund could (i) experience delays in recovering cash or the securities sold (and during such delay the value of the underlying securities may change in a manner adverse to the fund) and/or (ii) lose all or part of the income, proceeds or rights in the securities to which the Fund would otherwise be entitled.
Variable and Floating Rate Securities Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Variable and Floating-Rate Securities Risk The value of these securities may decline if their interest rates do not rise as much, or as quickly, as other interest rates. Conversely, these securities will not generally increase in value to the same extent as other fixed income securities, or at all, if interest rates decline.
Investments in Other Investment Companies Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Investments in Other Investment Companies Risk The risk that an investment company or other pooled investment vehicle in which the Fund invests will not achieve its investment objective or execute its investment strategies effectively or that significant purchase or redemption activity by shareholders of such an investment company might negatively affect the value of the investment company’s shares. There will be some duplication of expenses because the Fund also must pay its pro-rata share of that investment company’s fees and expenses.
Issuer Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Issuer Risk The risk that the value of a security may decline because of adverse events or circumstances that directly relate to the issuer.
Manager Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Manager Risk  The risk that the subadviser's decisions, including security selection, will cause the Fund to underperform relative to the Fund’s peers. There can be no assurance that the subadviser’s investment techniques and decisions will produce the desired results. The Fund’s ability to achieve its investment objective is dependent upon the subadviser’s ability to identify profitable investment opportunities for the Fund. The past experience of the portfolio manager(s), including with other strategies and funds, does not guarantee future results for the Fund.
Financial Markets Regulatory Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Financial Markets Regulatory Risk  Policy changes by the U.S. Government or its regulatory agencies and other governmental actions and political events within the United States and abroad may, among other things, affect investor and consumer confidence and increase volatility in the financial markets, perhaps suddenly and to a significant degree, which may adversely impact the Fund, including adversely impacting the Fund’s operations, universe of potential investment options, and return potential.
Changing Fixed Income Market Conditions Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Changing Fixed Income Market Conditions Risk  Increases in the federal funds and equivalent foreign rates or other changes to monetary policy or regulatory actions may expose fixed income markets to heightened volatility, perhaps suddenly and to a significant degree, and to reduced liquidity for certain fixed income investments, particularly those with longer maturities. Such changes and resulting increased volatility may adversely impact the Fund, including its operations, universe of potential investment options, and return potential. It is difficult to predict the impact of interest rate changes on various markets. In addition, decreases in fixed income dealer market-making capacity may also potentially lead to heightened volatility and reduced liquidity in the fixed income markets. As a result, the value of the Fund’s investments may decline. Changes in central bank policies and other governmental actions and political events within the U.S. and abroad may also, among other things, affect investor and consumer expectations and confidence in the financial markets, which could result in higher than normal redemptions by shareholders, which could potentially increase the Fund’s transaction costs.
Risk Lose Money [Member]
Prospectus [Line Items]
Risk [Text Block]	You could lose money by investing in the Fund.You could lose money investing in the Fund.
Risk Not Insured Depository Institution [Member]
Prospectus [Line Items]
Risk [Text Block]	An investment in the Fund is not a bank account and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Risk Money Market Fund May Not Preserve Dollar [Member]
Prospectus [Line Items]
Risk [Text Block]	Although the Fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it. The share price of money market funds can fall below the $1.00 share price.
Risk Money Market Fund Sponsor May Not Provide Support [Member]
Prospectus [Line Items]
Risk [Text Block]	Although the Fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do soThe Fund’s sponsor has no legal obligation to provide financial support to the Fund, and you should not expect that the sponsor will provide financial support to the Fund at any time.The Fund’s sponsor is not required to reimburse the Fund for losses, and you should not rely on or expect that the sponsor will enter into support agreements or take other actions to provide financial support to the Fund or maintain the Fund’s $1.00 share price at any time, including during periods of market stress