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American Funds U.S. Government Money Market Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading American Funds U.S. Government Money Market Fund
Objective [Heading] rr_ObjectiveHeading Investment objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The investment objective of the fund is to provide you with a way to earn income on your cash reserves while preserving capital and maintaining liquidity. The fund is a government money market fund that seeks to preserve the value of your investment at $1.00 per share.
Expense [Heading] rr_ExpenseHeading Fees and expenses of the fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. For example, in addition to the fees and expenses described below, you may also be required to pay brokerage commissions on purchases and sales of Class F-2, F-3, 529-F-2, 529-F-3 or ABLE-F-2 shares of the fund. Upon selling shares of the fund or exchanging those shares for shares of other American Funds, you may qualify for certain sales charge discounts. More information about these and other discounts is available from your financial professional and in the sales charge waiver appendix to this prospectus.

Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination Dec. 01, 2024
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Restated to reflect current fees.
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

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. The example also assumes that your investment has a 5% return each year and that the fund’s operating expenses remain the same. The example reflects the fee waiver described above through the expiration date of such fee waiver and total annual fund operating expenses thereafter. You may be required to pay brokerage commissions on your purchases and sales of Class F-2, F-3, 529-F-2, 529-F-3 or ABLE-F-2 shares of the fund, which are not reflected in the example.

Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption For the share classes listed to the right, you would pay the following if you did not redeem your shares:
Strategy [Heading] rr_StrategyHeading Principal investment strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

The fund will invest at least 99.5% of its total assets in cash, U.S. Treasury securities and other government securities guaranteed or issued by an agency or instrumentality of the U.S. government, and repurchase agreements that are fully collateralized by cash or government securities. Additionally, at least 80% of the fund’s assets will normally be invested in securities that are issued or guaranteed by the U.S. government, its agencies and instrumentalities, and repurchase agreements that are fully collateralized by government securities.

Repurchase agreements are agreements under which the fund purchases a security from a bank or broker-dealer and obtains a simultaneous commitment from the seller to repurchase the security at a specified time and price. Because the security purchased by the fund constitutes collateral for the seller’s repurchase obligation, a repurchase agreement is effectively a loan by the fund that is collateralized by the security purchased. The fund will only enter into repurchase agreements involving securities of the type (excluding any maturity limitations) in which it could otherwise invest. In practice, the fund expects to enter only into repurchase agreements that are fully collateralized by cash or U.S. government securities.

The fund relies on the professional judgment of its investment adviser to make decisions about the fund’s portfolio investments. The basic investment philosophy of the investment adviser is to seek to provide current income while preserving capital and maintaining liquidity.
Risk [Heading] rr_RiskHeading Principal risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Investment results
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The following bar chart shows how the fund’s investment results have varied from year to year, and the following table shows how the fund’s average annual total returns for various periods compare with a broad measure of securities market results and other applicable measures of market results. This information provides some indication of the risks of investing in the fund. The Lipper U.S. Government Money Market Funds Average includes the fund and other funds that disclose investment objectives and/or strategies reasonably comparable to those of the fund. Prior to April 1, 2016, the fund operated as a prime money market fund and may have invested in certain types of securities that the fund is no longer permitted to hold. Consequently, the results information below may have been different if the current investment limitations had been in effect during the period prior to the fund’s conversion to a government money market fund. Past investment results are not predictive of future investment results. Prior to October 30, 2020, certain fees, such as 12b-1 fees, were not charged on Class 529-F-1 shares. If these expenses had been deducted, results would have been lower. Updated information on the fund’s investment results can be obtained by visiting capitalgroup.com.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following bar chart shows how the fund’s investment results have varied from year to year, and the following table shows how the fund’s average annual total returns for various periods compare with a broad measure of securities market results and other applicable measures of market results.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The Lipper U.S. Government Money Market Funds Average includes the fund and other funds that disclose investment objectives and/or strategies reasonably comparable to those of the fund.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress capitalgroup.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past investment results are not predictive of future investment results.
Bar Chart [Heading] rr_BarChartHeading Calendar year total returns for Class F-2 shares
Bar Chart Narrative [Text Block] rr_BarChartNarrativeTextBlock

The following bar chart shows how the fund’s investment results have varied from year to year, and the following table shows how the fund’s average annual total returns for various periods compare with a broad measure of securities market results and other applicable measures of market results.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

Highest/Lowest quarterly results during this period were:

 

Highest 0.83% (quarter ended December 31, 2022)

 

Lowest 0.00%

The fund's total return for the nine months ended September 30, 2023, was 3.49%.
Year to Date Return, Label rr_YearToDateReturnLabel The fund's total return for the nine months ended
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2023
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 3.49%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2022
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 0.83%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn none
Average Annual Return, Caption rr_AverageAnnualReturnCaption Average annual total returns For the periods ended December 31, 2022:
Money Market Seven Day Yield Phone rr_MoneyMarketSevenDayYieldPhone (800) 421-4225
American Funds U.S. Government Money Market Fund | Risk Money Market Fund Price Fluctuates [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Accordingly, the current market values for these securities will fluctuate with changes in interest rates and the credit rating of the U.
American Funds U.S. Government Money Market Fund | Risk Not Insured [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock 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.
American Funds U.S. Government Money Market Fund | Risk Money Market Fund Sponsor May Not Provide Support [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock 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.
American Funds U.S. Government Money Market Fund | Risk Money Market Fund May Not Preserve Dollar [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock 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.
American Funds U.S. Government Money Market Fund | Market conditions [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock 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; 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.
American Funds U.S. Government Money Market Fund | Investing in securities backed by the U.S. government [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Investing in securities backed by the U.S. government — 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 at $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. U.S. government securities are subject to market risk, interest rate risk and credit risk.
American Funds U.S. Government Money Market Fund | Interest rate risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock 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.
American Funds U.S. Government Money Market Fund | Investing in repurchase agreements [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock 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.
American Funds U.S. Government Money Market Fund | Management [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock 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.
American Funds U.S. Government Money Market Fund | Risk Lose Money [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock You could lose money by investing in the fund.
American Funds U.S. Government Money Market Fund | USTREAS T-Bill Auction Ave 3 Mon (reflects no deductions for sales charges, account fees, expenses or U.S. federal income taxes)  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 2.13%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.34%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 0.82%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 0.62%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2009
American Funds U.S. Government Money Market Fund | Lipper U.S. Government Money Market Funds Average (reflects no deductions for sales charges, account fees or U.S. federal income taxes)  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 1.23%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 0.88%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 0.47%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 0.35%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2009
American Funds U.S. Government Money Market Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of the amount redeemed) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum sales charge (load) imposed on reinvested dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption or exchange fees rr_RedemptionFeeOverRedemption none
Management fees rr_ManagementFeesOverAssets 0.27%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other expenses rr_OtherExpensesOverAssets 0.11% [1]
Total annual fund operating expenses rr_ExpensesOverAssets 0.53%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 54
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 170
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 296
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 665
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 1.33%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 0.98%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 0.54%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 0.40%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2009
American Funds U.S. Government Money Market Fund | Class 529-A  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of the amount redeemed) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum sales charge (load) imposed on reinvested dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption or exchange fees rr_RedemptionFeeOverRedemption none
Management fees rr_ManagementFeesOverAssets 0.27%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other expenses rr_OtherExpensesOverAssets 0.16% [1]
Total annual fund operating expenses rr_ExpensesOverAssets 0.58%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 59
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 186
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 324
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 726
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 1.29%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 0.93%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 0.51%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 0.37%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2009
American Funds U.S. Government Money Market Fund | Class ABLE-A  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of the amount redeemed) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum sales charge (load) imposed on reinvested dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption or exchange fees rr_RedemptionFeeOverRedemption none
Management fees rr_ManagementFeesOverAssets 0.27%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other expenses rr_OtherExpensesOverAssets 0.14% [1]
Total annual fund operating expenses rr_ExpensesOverAssets 0.56%
Fee waiver rr_FeeWaiverOrReimbursementOverAssets 0.06% [2]
Total annual fund operating expenses after fee waiver rr_NetExpensesOverAssets 0.50%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 51
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 173
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 307
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 696
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 1.34%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 0.95%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jul. 13, 2018
American Funds U.S. Government Money Market Fund | Class C  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of the amount redeemed) rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00%
Maximum sales charge (load) imposed on reinvested dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption or exchange fees rr_RedemptionFeeOverRedemption none
Management fees rr_ManagementFeesOverAssets 0.27%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.11% [1]
Total annual fund operating expenses rr_ExpensesOverAssets 0.63%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 164
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 202
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 351
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 757
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 64
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 202
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 351
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 757
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 0.33%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 0.97%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 0.53%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 0.39%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2009
American Funds U.S. Government Money Market Fund | Class 529-C  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of the amount redeemed) rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00%
Maximum sales charge (load) imposed on reinvested dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption or exchange fees rr_RedemptionFeeOverRedemption none
Management fees rr_ManagementFeesOverAssets 0.27%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.16% [1]
Total annual fund operating expenses rr_ExpensesOverAssets 0.68%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 169
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 218
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 379
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 779
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 69
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 218
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 379
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 779
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 0.29%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 0.93%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 0.50%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 0.37%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2009
American Funds U.S. Government Money Market Fund | Class 529-E  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of the amount redeemed) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum sales charge (load) imposed on reinvested dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption or exchange fees rr_RedemptionFeeOverRedemption none
Management fees rr_ManagementFeesOverAssets 0.27%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.15% [1]
Total annual fund operating expenses rr_ExpensesOverAssets 0.67%
Total annual fund operating expenses after fee waiver rr_NetExpensesOverAssets 0.67%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 68
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 214
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 373
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 835
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 1.29%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 0.94%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 0.51%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 0.37%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2009
American Funds U.S. Government Money Market Fund | Class T  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of the amount redeemed) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum sales charge (load) imposed on reinvested dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption or exchange fees rr_RedemptionFeeOverRedemption none
Management fees rr_ManagementFeesOverAssets 0.27%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.10% [1]
Total annual fund operating expenses rr_ExpensesOverAssets 0.37%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 287
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 366
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 452
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 706
American Funds U.S. Government Money Market Fund | Class 529-T  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of the amount redeemed) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum sales charge (load) imposed on reinvested dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption or exchange fees rr_RedemptionFeeOverRedemption none
Management fees rr_ManagementFeesOverAssets 0.27%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.17% [1]
Total annual fund operating expenses rr_ExpensesOverAssets 0.44%
Total annual fund operating expenses after fee waiver rr_NetExpensesOverAssets 0.44%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 294
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 388
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 490
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 791
American Funds U.S. Government Money Market Fund | Class F-1  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of the amount redeemed) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum sales charge (load) imposed on reinvested dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption or exchange fees rr_RedemptionFeeOverRedemption none
Management fees rr_ManagementFeesOverAssets 0.27%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.15% [1]
Total annual fund operating expenses rr_ExpensesOverAssets 0.67%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 68
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 214
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 373
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 835
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 1.15%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 0.80%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 0.42%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 0.31%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2009
American Funds U.S. Government Money Market Fund | Class F-2  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of the amount redeemed) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum sales charge (load) imposed on reinvested dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption or exchange fees rr_RedemptionFeeOverRedemption none
Management fees rr_ManagementFeesOverAssets 0.27%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.10% [1]
Total annual fund operating expenses rr_ExpensesOverAssets 0.37%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 38
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 119
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 208
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 468
Annual Return 2013 rr_AnnualReturn2013 none
Annual Return 2014 rr_AnnualReturn2014 none
Annual Return 2015 rr_AnnualReturn2015 none
Annual Return 2016 rr_AnnualReturn2016 none
Annual Return 2017 rr_AnnualReturn2017 0.44%
Annual Return 2018 rr_AnnualReturn2018 1.44%
Annual Return 2019 rr_AnnualReturn2019 1.82%
Annual Return 2020 rr_AnnualReturn2020 0.27%
Annual Return 2021 rr_AnnualReturn2021 none
Annual Return 2022 rr_AnnualReturn2022 1.36%
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 1.36%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 0.98%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 0.53%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 0.39%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2009
American Funds U.S. Government Money Market Fund | Class F-3  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of the amount redeemed) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum sales charge (load) imposed on reinvested dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption or exchange fees rr_RedemptionFeeOverRedemption none
Management fees rr_ManagementFeesOverAssets 0.27%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.04% [1]
Total annual fund operating expenses rr_ExpensesOverAssets 0.31%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 32
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 100
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 174
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 393
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 1.39%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.02%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 0.94%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jan. 27, 2017
American Funds U.S. Government Money Market Fund | Class 529-F-1  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of the amount redeemed) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum sales charge (load) imposed on reinvested dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption or exchange fees rr_RedemptionFeeOverRedemption none
Management fees rr_ManagementFeesOverAssets 0.27%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.21% [1]
Total annual fund operating expenses rr_ExpensesOverAssets 0.73%
Total annual fund operating expenses after fee waiver rr_NetExpensesOverAssets 0.73%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 75
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 233
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 406
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 906
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 1.27%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 0.93%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 0.50%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 0.37%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2009
American Funds U.S. Government Money Market Fund | Class 529-F-2  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of the amount redeemed) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum sales charge (load) imposed on reinvested dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption or exchange fees rr_RedemptionFeeOverRedemption none
Management fees rr_ManagementFeesOverAssets 0.27%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.16% [1]
Total annual fund operating expenses rr_ExpensesOverAssets 0.43%
Total annual fund operating expenses after fee waiver rr_NetExpensesOverAssets 0.43%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 44
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 138
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 241
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 542
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 1.31%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 0.60%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Oct. 30, 2020
American Funds U.S. Government Money Market Fund | Class 529-F-3  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of the amount redeemed) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum sales charge (load) imposed on reinvested dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption or exchange fees rr_RedemptionFeeOverRedemption none
Management fees rr_ManagementFeesOverAssets 0.27%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.10% [1]
Total annual fund operating expenses rr_ExpensesOverAssets 0.37%
Total annual fund operating expenses after fee waiver rr_NetExpensesOverAssets 0.37%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 38
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 119
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 208
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 468
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 1.34%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 0.62%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Oct. 30, 2020
American Funds U.S. Government Money Market Fund | Class ABLE-F-2  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of the amount redeemed) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum sales charge (load) imposed on reinvested dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption or exchange fees rr_RedemptionFeeOverRedemption none
Management fees rr_ManagementFeesOverAssets 0.27%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.15% [1]
Total annual fund operating expenses rr_ExpensesOverAssets 0.42%
Fee waiver rr_FeeWaiverOrReimbursementOverAssets 0.06% [2]
Total annual fund operating expenses after fee waiver rr_NetExpensesOverAssets 0.36%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 37
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 129
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 229
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 524
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 1.36%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 0.62%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Oct. 30, 2020
American Funds U.S. Government Money Market Fund | Class R-1  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of the amount redeemed) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum sales charge (load) imposed on reinvested dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption or exchange fees rr_RedemptionFeeOverRedemption none
Management fees rr_ManagementFeesOverAssets 0.27%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.11% [1]
Total annual fund operating expenses rr_ExpensesOverAssets 0.38%
Total annual fund operating expenses after fee waiver rr_NetExpensesOverAssets 0.38%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 39
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 122
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 213
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 480
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 1.34%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 0.96%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 0.52%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 0.38%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2009
American Funds U.S. Government Money Market Fund | Class R-2  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of the amount redeemed) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum sales charge (load) imposed on reinvested dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption or exchange fees rr_RedemptionFeeOverRedemption none
Management fees rr_ManagementFeesOverAssets 0.27%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.75%
Other expenses rr_OtherExpensesOverAssets 0.38% [1]
Total annual fund operating expenses rr_ExpensesOverAssets 1.40%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 143
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 443
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 766
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,680
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 0.74%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 0.39%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 0.20%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 0.14%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2009
American Funds U.S. Government Money Market Fund | Class R-3  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of the amount redeemed) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum sales charge (load) imposed on reinvested dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption or exchange fees rr_RedemptionFeeOverRedemption none
Management fees rr_ManagementFeesOverAssets 0.27%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Other expenses rr_OtherExpensesOverAssets 0.19% [1]
Total annual fund operating expenses rr_ExpensesOverAssets 0.96%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 98
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 306
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 531
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,178
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 0.98%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 0.65%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 0.32%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 0.24%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2009
American Funds U.S. Government Money Market Fund | Class R-4  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of the amount redeemed) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum sales charge (load) imposed on reinvested dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption or exchange fees rr_RedemptionFeeOverRedemption none
Management fees rr_ManagementFeesOverAssets 0.27%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.14% [1]
Total annual fund operating expenses rr_ExpensesOverAssets 0.66%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 67
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 211
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 368
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 822
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 1.15%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 0.80%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 0.43%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 0.31%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2009
American Funds U.S. Government Money Market Fund | Class R-5  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of the amount redeemed) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum sales charge (load) imposed on reinvested dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption or exchange fees rr_RedemptionFeeOverRedemption none
Management fees rr_ManagementFeesOverAssets 0.27%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.09% [1]
Total annual fund operating expenses rr_ExpensesOverAssets 0.36%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 37
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 116
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 202
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 456
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 1.36%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 0.98%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 0.54%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 0.39%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2009
American Funds U.S. Government Money Market Fund | Class R-6  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of the amount redeemed) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum sales charge (load) imposed on reinvested dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption or exchange fees rr_RedemptionFeeOverRedemption none
Management fees rr_ManagementFeesOverAssets 0.27%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.04% [1]
Total annual fund operating expenses rr_ExpensesOverAssets 0.31%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 32
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 100
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 174
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 393
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 1.39%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.01%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 0.56%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 0.41%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2009
American Funds U.S. Government Money Market Fund | Class R-2E  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of the amount redeemed) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum sales charge (load) imposed on reinvested dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption or exchange fees rr_RedemptionFeeOverRedemption none
Management fees rr_ManagementFeesOverAssets 0.27%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.60%
Other expenses rr_OtherExpensesOverAssets 0.24% [1]
Total annual fund operating expenses rr_ExpensesOverAssets 1.11%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 113
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 353
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 612
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,352
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 0.90%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 0.56%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 0.33%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Aug. 29, 2014
American Funds U.S. Government Money Market Fund | Class R-5E  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of the amount redeemed) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum sales charge (load) imposed on reinvested dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption or exchange fees rr_RedemptionFeeOverRedemption none
Management fees rr_ManagementFeesOverAssets 0.27%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.19% [1]
Total annual fund operating expenses rr_ExpensesOverAssets 0.46%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 47
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 148
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 258
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 579
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 1.29%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 0.93%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 0.70%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Nov. 20, 2015
[1] Restated to reflect current fees.
[2] Virginia529, as program administrator of ABLEAmerica, is currently waiving the fee owed to it as compensation for its oversight and administration of ABLEAmerica. This waiver will be in effect through at least December 1, 2024. Subject to the terms of its contractual arrangement with the investment adviser, Virginia529 may elect to extend, modify or terminate the waiver at that time.