Investment Risks - American Funds U.S. Government Money Market Fund	Nov. 28, 2025
Risk Lose Money [Member]
Prospectus [Line Items]
Risk [Text Block]	You could lose money by investing in the fund.
Risk Not Insured [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 Price Fluctuates [Member]
Prospectus [Line Items]
Risk [Text Block]	Accordingly, the current market values for these securities will fluctuate with changes in interest rates and the credit rating of the U.
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 is possible to lose money by investing in the fund.
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.
Market conditions [Member]
Prospectus [Line Items]
Risk [Text Block]	Market conditions — The prices of, and the income generated by, the securities held by the fund may decline – sometimes rapidly or unpredictably – due to various factors, including events or conditions affecting the general economy or particular industries or companies; overall market changes; local, regional or global political, social or economic instability; governmental, governmental agency or central bank responses to economic conditions; levels of public debt and deficits; changes in inflation rates; and currency exchange rate, interest rate and commodity price fluctuations. Economies and financial markets throughout the world are highly interconnected. Economic, financial or political events, trading and tariff arrangements, wars, terrorism, cybersecurity events, natural disasters, public health emergencies (such as the spread of infectious disease), bank failures and other circumstances in one country or region, including actions taken by governmental or quasi-governmental authorities in response to any of the foregoing, could have impacts on global economies or markets. As a result, whether or not the fund invests in securities of issuers located in or with significant exposure to the countries affected, the value and liquidity of the fund’s investments may be negatively affected by developments in other countries and regions.
Investing in securities backed by the U.S. government [Member]
Prospectus [Line Items]
Risk [Text Block]	Investing in securities backed by the U.S. government — U.S. government securities are subject to market risk, interest rate risk and credit risk. Securities backed by the U.S. Treasury or the full faith and credit of the U.S. government are guaranteed only as to the timely payment of interest and principal when held to maturity. Accordingly, the current market values for these securities will fluctuate with changes in interest rates and the credit rating of the U.S. government. Notwithstanding that these securities are backed by the full faith and credit of the U.S. government, circumstances could arise that would prevent or delay the payment of interest or principal on these securities, which could adversely affect their value and the fund's ability to preserve the value of your investment. In such a situation, the fund may not be able to preserve its net asset value of $1.00 per share. Such an event could lead to significant disruptions in U.S. and global markets. Securities issued by U.S. government-sponsored entities and federal agencies and instrumentalities that are not backed by the full faith and credit of the U.S. government are neither issued nor guaranteed by the U.S. government.
Interest Rate Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Interest rate risk — The values and liquidity of the securities held by the fund may be affected by changing interest rates. For example, the values of these securities may decline when interest rates rise and increase when interest rates fall. Longer maturity debt securities generally have greater sensitivity to changes in interest rates and may be subject to greater price fluctuations than shorter maturity debt securities. The fund may invest in variable and floating rate securities. When the fund holds variable or floating rate securities, a decrease in market interest rates will adversely affect the income received from such securities and the net asset value of the fund’s shares. Although the values of such securities are generally less sensitive to interest rate changes than those of other debt securities, the value of variable and floating rate securities may decline if their interest rates do not rise as quickly, or as much, as market interest rates. Conversely, floating rate securities will not generally increase in value if interest rates decline. During periods of extremely low or negative short-term interest rates, the fund may not be able to maintain a positive yield or total return or be able to preserve the value of your investment at $1.00 per share and, in relatively low interest rate environments, there are heightened risks associated with rising interest rates.
Investing in repurchase agreements [Member]
Prospectus [Line Items]
Risk [Text Block]	Investing in repurchase agreements — Upon entering into a repurchase agreement, the fund purchases a security from a bank or broker-dealer, which simultaneously commits to repurchase the security within a specified time at the fund’s cost with interest. The security purchased by the fund constitutes collateral for the seller’s repurchase obligation. If the party agreeing to repurchase should default, the fund may seek to sell the security it holds as collateral. The fund may incur a loss if the value of the collateral securing the repurchase obligation falls below the repurchase price. The fund may also incur disposition costs and encounter procedural delays in connection with liquidating the collateral.
Management [Member]
Prospectus [Line Items]
Risk [Text Block]	Management — The investment adviser to the fund actively manages the fund’s investments. Consequently, the fund is subject to the risk that the methods and analyses, including models, tools and data, employed by the investment adviser in this process may be flawed or incorrect and may not produce the desired results.

Investment Risks - American Funds U.S. Government Money Market Fund

Nov. 28, 2025

You could lose money by investing in the fund.

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 Price Fluctuates [Member]

Prospectus [Line Items]

Risk [Text Block]

Accordingly, the current market values for these securities will fluctuate with changes in interest rates and the credit rating of the U.

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 is possible to lose money by investing in the fund.

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.

Market conditions [Member]

Prospectus [Line Items]

Risk [Text Block]

Market conditions — The prices of, and the income generated by, the securities held by the fund may decline – sometimes rapidly or unpredictably – due to various factors, including events or conditions affecting the general economy or particular industries or companies; overall market changes; local, regional or global political, social or economic instability; governmental, governmental agency or central bank responses to economic conditions; levels of public debt and deficits; changes in inflation rates; and currency exchange rate, interest rate and commodity price fluctuations.

Economies and financial markets throughout the world are highly interconnected. Economic, financial or political events, trading and tariff arrangements, wars, terrorism, cybersecurity events, natural disasters, public health emergencies (such as the spread of infectious disease), bank failures and other circumstances in one country or region, including actions taken by governmental or quasi-governmental authorities in response to any of the foregoing, could have impacts on global economies or markets. As a result, whether or not the fund invests in securities of issuers located in or with significant exposure to the countries affected, the value and liquidity of the fund’s investments may be negatively affected by developments in other countries and regions.

Investing in securities backed by the U.S. government [Member]

Prospectus [Line Items]

Risk [Text Block]

Investing in securities backed by the U.S. government — U.S. government securities are subject to market risk, interest rate risk and credit risk. Securities backed by the U.S. Treasury or the full faith and credit of the U.S. government are guaranteed only as to the timely payment of interest and principal when held to maturity. Accordingly, the current market values for these securities will fluctuate with changes in interest rates and the credit rating of the U.S. government. Notwithstanding that these securities are backed by the full faith and credit of the U.S. government, circumstances could arise that would prevent or delay the payment of interest or principal on these securities, which could adversely affect their value and the fund's ability to preserve the value of your investment. In such a situation, the fund may not be able to preserve its net asset value of $1.00 per share. Such an event could lead to significant disruptions in U.S. and global markets.

Securities issued by U.S. government-sponsored entities and federal agencies and instrumentalities that are not backed by the full faith and credit of the U.S. government are neither issued nor guaranteed by the U.S. government.

Interest Rate Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Interest rate risk — The values and liquidity of the securities held by the fund may be affected by changing interest rates. For example, the values of these securities may decline when interest rates rise and increase when interest rates fall. Longer maturity debt securities generally have greater sensitivity to changes in interest rates and may be subject to greater price fluctuations than shorter maturity debt securities. The fund may invest in variable and floating rate securities. When the fund holds variable or floating rate securities, a decrease in market interest rates will adversely affect the income received from such securities and the net asset value of the fund’s shares. Although the values of such securities are generally less sensitive to interest rate changes than those of other debt securities, the value of variable and floating rate securities may decline if their interest rates do not rise as quickly, or as much, as market interest rates. Conversely, floating rate securities will not generally increase in value if interest rates decline. During

periods of extremely low or negative short-term interest rates, the fund may not be able to maintain a positive yield or total return or be able to preserve the value of your investment at $1.00 per share and, in relatively low interest rate environments, there are heightened risks associated with rising interest rates.

Investing in repurchase agreements [Member]

Prospectus [Line Items]

Risk [Text Block]

Investing in repurchase agreements — Upon entering into a repurchase agreement, the fund purchases a security from a bank or broker-dealer, which simultaneously commits to repurchase the security within a specified time at the fund’s cost with interest. The security purchased by the fund constitutes collateral for the seller’s repurchase obligation. If the party agreeing to repurchase should default, the fund may seek to sell the security it holds as collateral. The fund may incur a loss if the value of the collateral securing the repurchase obligation falls below the repurchase price. The fund may also incur disposition costs and encounter procedural delays in connection with liquidating the collateral.

Management [Member]

Prospectus [Line Items]

Risk [Text Block]

Management — The investment adviser to the fund actively manages the fund’s investments. Consequently, the fund is subject to the risk that the methods and analyses, including models, tools and data, employed by the investment adviser in this process may be flawed or incorrect and may not produce the desired results.