Investment Risks - UBS Liquid Reserves Fund	Aug. 12, 2026
Interest rate risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Interest rate risk: The value of the fund’s investments generally will fall when short-term interest rates rise, and its yield will tend to lag behind prevailing rates. Securities with longer maturities generally are subject to greater fluctuations in value. Changes in interest rates will likely affect the value of higher-quality securities more than lower-quality securities. The fund may face a heightened level of interest rate risk due to certain changes in general economic conditions, inflation and monetary policy, such as certain types of interest rate changes by the Federal Reserve. Any such changes could be sudden and could expose debt markets to significant volatility and reduced liquidity for fund investments.
US Government securities risk [Member]
Prospectus [Line Items]
Risk [Text Block]	US Government securities risk: There are different types of US government securities with different levels of credit risk, including the risk of default, depending on the nature of the particular government support for that security. Securities issued or guaranteed by the US Treasury are backed by the full faith and credit of the United States, but are guaranteed only as to the timely payment of interest and principal when held to maturity, and the market prices for such securities will fluctuate. Notwithstanding that these securities are backed by the full faith and credit of the United States, circumstances could arise that would prevent the timely payment of interest or principal, which could result in losses to the fund (e.g., Congressional debt ceiling impasses).
Repurchase agreements risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Repurchase agreements risk: Repurchase agreements carry certain risks not associated with direct investments in securities, including a possible decline in the market value of the underlying obligations and the risk that the counterparty does not meet its obligations under the agreement.
Market risks [Member]
Prospectus [Line Items]
Risk [Text Block]	Market risk: The risk that the market value of the fund’s investments may fluctuate, sometimes rapidly or unpredictably, as the markets fluctuate, which may affect the fund’s share price. Market risk may affect a single issuer, industry, or sector of the economy, or it may affect the market as a whole. Moreover, changing market, economic, political and social conditions in one country or geographic region could adversely impact market, economic, political and social conditions in other countries or regions.
Stablecoin issuer reserves risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Stablecoin issuer reserves risk: Shares of the fund are expected to be held primarily by one or more stablecoin issuers as all or a portion of the reserve assets that back the outstanding stablecoins issued to their customers. Stablecoins generally are a type of cryptocurrency that are designed to maintain a stable value by pegging their value to another asset, such as a fiat currency like the US dollar, and stablecoin holders generally are permitted to redeem their stablecoins for a fixed amount of value. Although the fund does not invest in stablecoins or stablecoin issuers, the assets of the fund are expected to fluctuate depending on the creation (minting) of additional stablecoins or the redemption (burning) of outstanding stablecoins. Stablecoins and other digital assets that stablecoins may be used to purchase or sell may face periods of uncertainty and volatility that result in the potential for rapid or unexpected requests by one or more stablecoin issuers to redeem or purchase the fund’s shares. Such redemption requests could adversely affect remaining fund shareholders, the fund’s liquidity, and the fund’s ability to maintain a stable price per share, particularly if such redemptions occur in times of overall market turmoil or declining prices. Uncertainty or volatility may result from events that are not specifically related to a stablecoin issuer, such as changes in general market conditions, economic, technological or legal trends or changes to the laws or regulation of stablecoins, or events that are specifically related to a particular stablecoin issuer, such as uncertainty about the stablecoin issuer’s ability to maintain a consistent peg between the stablecoins issued to its customers and another asset, such as a fiat currency like the US dollar. Because the fund intends to invest only in certain eligible reserve assets that payment stablecoin issuers are permitted to maintain under the GENIUS Act, the fund’s yield may be lower than other money market funds that are permitted to invest in a wider universe of investments and with longer maturities.
Liquidity risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Liquidity risk: Although the fund invests in a diversified portfolio of high quality instruments, the fund’s investments may become less liquid as a result of market developments or adverse investor perception. If this happens, the fund’s ability to redeem its shares for cash may be affected.
Management risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Management risk: The risk that the investment strategies, techniques and risk analyses employed by the advisor may not produce the desired results. Consequently, the fund may underperform in comparison to other funds with similar objectives and investment strategies.
Credit risks [Member]
Prospectus [Line Items]
Risk [Text Block]	Credit risk: Issuers of money market instruments or financial institutions that have entered into repurchase agreements with the fund may fail to make payments when due or complete transactions, or they may become less willing or less able to do so.
Risk Lose Money [Member]
Prospectus [Line Items]
Risk [Text Block]	You could lose money by 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 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 will do so.
Risk Money Market Fund Sponsor May Not Provide Support [Member]
Prospectus [Line Items]
Risk [Text Block]	The fund’s sponsor is not required to reimburse the fund for losses, and you should not expect that the sponsor will provide financial support to the fund at any time, including during periods of market stress.

Investment Risks - UBS Liquid Reserves Fund

Aug. 12, 2026

Interest rate risk: The value of the fund’s investments generally will fall when short-term interest rates rise, and its yield will tend to lag behind prevailing rates. Securities with longer maturities generally are subject to greater fluctuations in value. Changes in interest rates will likely affect the value of higher-quality securities more than lower-quality securities. The fund may face a heightened level of interest rate risk due to certain changes in general economic conditions, inflation and monetary policy, such as certain types of interest rate changes by the Federal Reserve. Any such changes could be sudden and could expose debt markets to significant volatility and reduced liquidity for fund investments.

Prospectus [Line Items]

Risk [Text Block]

US Government securities risk: There are different types of US government securities with different levels of credit risk, including the risk of default, depending on the nature of the particular government support for that security. Securities issued or guaranteed by the US Treasury are backed by the full faith and credit of the United States, but are guaranteed only as to the timely payment of interest and principal when held to maturity, and the market prices for such securities will fluctuate. Notwithstanding that these securities are backed by the full faith and credit of the United States, circumstances could arise that would prevent the timely payment of interest or principal, which could result in losses to the fund (e.g., Congressional debt ceiling impasses).

Repurchase agreements risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Repurchase agreements risk: Repurchase agreements carry certain risks not associated with direct investments in securities, including a possible decline in the market value of the underlying obligations and the risk that the counterparty does not meet its obligations under the agreement.

Market risks [Member]

Prospectus [Line Items]

Risk [Text Block]

Market risk: The risk that the market value of the fund’s investments may fluctuate, sometimes rapidly or unpredictably, as the markets fluctuate, which may affect the fund’s share price. Market risk may affect a single issuer, industry, or sector of the economy, or it may affect the market as a whole. Moreover, changing market, economic, political and social conditions in one country or geographic region could adversely impact market, economic, political and social conditions in other countries or regions.

Stablecoin issuer reserves risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Stablecoin issuer reserves risk: Shares of the fund are expected to be held primarily by one or more stablecoin issuers as all or a portion of the reserve assets that back the outstanding stablecoins issued to their customers. Stablecoins generally are a type of cryptocurrency that are designed to maintain a stable value by pegging their value to another asset, such as a fiat currency like the US dollar, and stablecoin holders generally are permitted to redeem their stablecoins for a fixed amount of value. Although the fund does not invest in stablecoins or stablecoin issuers, the assets of the fund are expected to fluctuate depending on the creation (minting) of additional stablecoins or the redemption (burning) of outstanding stablecoins. Stablecoins and other digital assets that stablecoins may be used to purchase or sell may face periods of uncertainty and volatility that result in the potential for rapid or unexpected requests by one or more stablecoin issuers to redeem or purchase the fund’s shares. Such redemption requests could adversely affect remaining fund shareholders, the fund’s liquidity, and the fund’s ability to maintain a stable price per share, particularly if such redemptions occur in times of overall market turmoil or declining prices. Uncertainty or volatility may result from events that are not specifically related to a stablecoin issuer, such as changes in general market conditions, economic, technological or legal trends or changes to the laws or regulation of stablecoins, or events that are specifically related to a particular stablecoin issuer, such as uncertainty about the stablecoin issuer’s ability to maintain a consistent peg between the stablecoins issued to its customers and another asset, such as a fiat currency like the US dollar. Because the fund intends to invest only in certain eligible reserve assets that payment stablecoin issuers are permitted to maintain under the GENIUS Act, the fund’s yield may be lower than other money market funds that are permitted to invest in a wider universe of investments and with longer maturities.

Liquidity risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Liquidity risk: Although the fund invests in a diversified portfolio of high quality instruments, the fund’s investments may become less liquid as a result of market developments or adverse investor perception. If this happens, the fund’s ability to redeem its shares for cash may be affected.

Management risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Management risk: The risk that the investment strategies, techniques and risk analyses employed by the advisor may not produce the desired results. Consequently, the fund may underperform in comparison to other funds with similar objectives and investment strategies.

Credit risks [Member]

Prospectus [Line Items]

Risk [Text Block]

Credit risk: Issuers of money market instruments or financial institutions that have entered into repurchase agreements with the fund may fail to make payments when due or complete transactions, or they may become less willing or less able to do so.

Risk Lose Money [Member]

Prospectus [Line Items]

Risk [Text Block]

You could lose money by 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 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 will do so.

Risk Money Market Fund Sponsor May Not Provide Support [Member]

Prospectus [Line Items]

Risk [Text Block]

The fund’s sponsor is not required to reimburse the fund for losses, and you should not expect that the sponsor will provide financial support to the fund at any time, including during periods of market stress.