| T. Rowe Price Cash Reserves Fund | |||||||||||||||
| T. Rowe Price Cash Reserves Fund SUMMARY | |||||||||||||||
| Investment Objective | |||||||||||||||
| The fund seeks preservation of capital and liquidity and, consistent with these, the highest possible current income. | |||||||||||||||
| Fees and Expenses | |||||||||||||||
| This table describes the fees and expenses that you may pay if you buy and hold shares of the fund. You may also incur brokerage commissions and other charges when buying or selling shares of the fund, which are not reflected in the table. | |||||||||||||||
| Fees and Expenses of the Fund Shareholder fees (fees paid directly from your investment) | |||||||||||||||
| |||||||||||||||
| Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment) | |||||||||||||||
| |||||||||||||||
| Example | |||||||||||||||
| This example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem all of your shares at the end of those periods, that your investment has a 5% return each year, and that the fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be: | |||||||||||||||
| |||||||||||||||
| Investments, Risks, and Performance Principal Investment Strategies | |||||||||||||||
| The fund is a retail money market fund managed in compliance with Rule 2a-7 under the Investment Company Act of 1940, as amended (1940 Act). The securities purchased by the fund are subject to the maturity, quality, diversification, and other requirements of Rule 2a-7. All securities purchased by the fund present minimal credit risk in the opinion of T. Rowe Price. The fund is managed to provide a stable share price of $1.00 by investing in high-quality, U.S. dollar-denominated money market securities. Money market securities are generally high-quality, short-term obligations issued by companies or governmental entities. The fund’s weighted average maturity will not exceed 60 calendar days, the fund’s weighted average life will not exceed 120 calendar days, and the fund will not purchase any security with a remaining maturity longer than 397 calendar days (unless otherwise permitted by Rule 2a-7, such as certain variable and floating rate instruments). When calculating its weighted average maturity, the fund may shorten its maturity by using the interest rate resets of certain adjustable rate securities. The fund may not take into account these resets when calculating its weighted average life. In addition to investing in money market securities issued by corporations and financial institutions, the fund may also invest in U.S. Treasury securities and other U.S. government securities, and repurchase agreements thereon; municipal money market securities issued by state and local governments; and money market securities issued by foreign companies and financial institutions, which include U.S. dollar-denominated money market securities traded outside of the U.S. and U.S. dollar-denominated money market securities of foreign issuers traded in the U.S. There is no limit to the fund’s investments in U.S. dollar-denominated money market securities of foreign issuers. The fund may invest in repurchase agreements. A repurchase agreement is a contract under which the fund (buyer) purchases a security, usually a U.S. government or agency security, from a bank or well-established securities dealer (seller) that requires the seller to repurchase the securities from the fund at a specific price on a designated date (which is often the next business day). The fund may sell holdings for a variety of reasons, such as to adjust the portfolio’s average maturity or to shift assets into and out of higher-yielding securities. In accordance with the requirements for “retail money market funds” under Rule 2a-7, the fund has implemented policies and procedures designed to limit accounts to only those beneficially owned by natural persons. The fund has also obtained assurances from its intermediaries that they have developed adequate procedures to limit accounts to only those beneficially owned by natural persons. Any new investors wishing to purchase shares will be required to demonstrate eligibility (for example, by providing their Social Security number). Pursuant to Rule 2a-7, if the fund’s weekly liquid assets fall below 30% of its total assets, the fund’s Board of Directors, in its discretion, may impose liquidity fees of up to 2% of the value of the shares redeemed or temporarily suspend redemptions from the fund for up to 10 business days during any 90–day period (i.e., a “redemption gate”). In addition, if the fund’s weekly liquid assets fall below 10% of its total assets at the end of any business day, the fund must impose a 1% liquidity fee on shareholder redemptions unless the fund’s Board of Directors determines that not doing so is in the best interests of the fund. Pursuant to Rule 2a-7, weekly liquid assets include cash, U.S. Treasuries, other government securities with remaining maturities of 60 days or less, or securities that mature or are subject to a demand feature within five business days. | |||||||||||||||
| Principal Risks | |||||||||||||||
| As with any mutual fund, there can be no guarantee the fund will achieve its objective. You could lose money by investing in the fund. Although the fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so. The fund may impose a fee upon the sale of your shares or may temporarily suspend your ability to sell shares if the fund’s liquidity falls below required minimums because of market conditions or other factors. An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. T. Rowe Price Associates, Inc. has no legal obligation to provide financial support to the fund, and you should not expect that T. Rowe Price Associates, Inc. will provide financial support to the fund at any time. Money market funds have experienced significant pressures from shareholder redemptions, issuer credit downgrades, illiquid markets, and historically low yields on the securities they can hold. There have been a very small number of money market funds in other fund complexes that have “broken the buck,” which means that those funds’ investors did not receive $1.00 per share for their investment in those funds. The potential for realizing a loss of principal in the fund could derive from: Credit risks An issuer of a debt instrument , or counterparty to a repurchase agreement entered into by the fund, could suffer an adverse change in financial condition that results in a payment default (a failure to make scheduled interest or principal payments), rating downgrade, or inability to meet a financial obligation. Although the fund only purchases securities that present minimal credit risk in the opinion of T. Rowe Price, the credit quality of the fund’s holdings could change rapidly during periods of market stress. Interest rate risks A decline in interest rates may lower the fund's yield, or a rise in the overall level of interest rates may cause a decline in the prices of fixed income securities held by the fund. The fund's yield will vary; it is not fixed for a specific period like the yield on a bank certificate of deposit. This is a disadvantage when interest rates are falling because the fund would have to reinvest at lower interest rates. The fund may face a heightened level of interest rate risk due to historically low interest rates and the potential effect of any government fiscal policy initiatives; for example, the U.S. Federal Reserve Board has ended its quantitative easing program and may continue to raise interest rates. A sharp and unexpected rise in interest rates could increase the likelihood that the fund's share price will drop below a dollar. Liquidity risks The fund may not be able to sell a holding in a timely manner at its current carrying value. The fund may experience heavy redemptions, particularly during periods of declining or illiquid markets, which could cause the fund to liquidate its assets at inopportune times or at a depressed value and affect the fund’s ability to maintain a $1.00 share price. In addition, the fund’s Board of Directors has discretion to impose a liquidity fee, to temporarily suspend fund redemptions when permitted by applicable regulations, or to liquidate the fund if the fund’s weekly liquid assets fall below 10%. Stable net asset value risks The fund may not be able to maintain a stable $1.00 share price at all times. If a money market fund fails to maintain a stable net asset value, or if there is a perceived threat that a money market fund is likely to fail to maintain a stable net asset value, money market funds in general, including the fund, could experience significant redemption activity. This could reduce the market prices of securities held by the fund and make it more difficult for the fund to maintain a stable $1.00 share price. The fund’s shareholders should not rely on or expect the fund’s investment adviser or an affiliate to purchase distressed assets from the fund, enter into capital support agreements with the fund, make capital infusions into the fund, or take other actions to help the fund maintain a stable $1.00 share price. Redemption risks The fund may be subject to periods of increased redemptions that could cause the fund to sell its assets at disadvantageous times or at a depressed value or loss, particularly during periods of declining or illiquid markets, and that could affect the fund’s ability to maintain a stable $1.00 share price. Periods of heavy redemptions may result in the fund’s level of weekly liquid assets falling below certain minimums required by Rule 2a-7, which may result in the fund’s Board of Directors imposing a liquidity fee or redemption gate. Municipal securities risks The fund's investments in municipal securities may be adversely affected by changes in the financial condition of certain municipal securities issuers and the economy, as well as by events such as unfavorable legislative or political developments that impact the overall municipal securities markets or certain sectors of the municipal securities market. Tax reform, including a lowering of individual or corporate tax rates, could reduce the attractiveness and overall demand for municipal bonds. The secondary market for certain municipal securities tends to be less developed and liquid than many other securities markets. Repurchase agreement risks A counterparty to a repurchase agreement may become insolvent or fail to repurchase securities from the fund as required, which could increase the fund's costs or prevent the fund from immediately accessing its collateral. Foreign investing risks The fund’s investments in foreign securities may be adversely affected by local, political, social, and economic conditions overseas, greater volatility, reduced liquidity, or differences in settlement and regulatory standards. | |||||||||||||||
| Performance | |||||||||||||||
| The following performance information provides some indication of the risks of investing in the fund. The fund’s performance information represents only past performance and is not necessarily an indication of future results. The following bar chart illustrates how much returns can differ from year to year by showing calendar year returns and the best and worst calendar quarter returns during those years for the fund. | |||||||||||||||
| Cash Reserves FundCalendar Year Returns | |||||||||||||||
| |||||||||||||||
| |||||||||||||||
| Average Annual Total Returns Periods ended December 31, 2017 | |||||||||||||||
| |||||||||||||||
| Updated performance information is available through troweprice.com. | |||||||||||||||