v3.23.4
Label Element Value
American Funds Tax-Exempt Preservation Portfolio  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading American Funds Tax-Exempt Preservation Portfolio
Objective [Heading] rr_ObjectiveHeading Investment objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The fund’s investment objective is to provide current income that is exempt from regular federal income tax, consistent with preservation of capital.

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 or F-3 shares of the fund. You may qualify for a Class A sales charge discount if you and your family invest, or agree to invest in the future, at least $500,000 in American Funds. More information about these and other discounts is available from your financial professional, in the “Sales charge reductions and waivers” sections on page 86 of the prospectus and on page 109 of the fund’s statement of additional information, and in the sales charge waiver appendix to the 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)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The fund may pay transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the fund’s investment results. During the most recent fiscal year, the fund’s portfolio turnover rate was 5% of the average value of its portfolio.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 5.00%
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 or hold 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. You may be required to pay brokerage commissions on your purchases and sales of Class F-2 or F-3 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 attempt to achieve its investment objective by investing in a mix of American Funds fixed income funds. The fund will principally invest in funds that seek current income through investments in bonds or in other fixed income instruments.

Under normal circumstances, the fund will derive at least 80% of its income from securities that are exempt from regular federal income tax and will invest at least 80% of its assets in funds that predominately invest in securities that are exempt from regular federal income tax.

The fund will seek to generate a material portion of its current income from underlying funds that invest in bonds that are exempt from regular income tax, such as municipal bonds. Some of these bonds may have credit and liquidity support features, including guarantees and letters of credit. In addition, an underlying bond fund may invest significantly in municipal obligations of multiple issuers in the same state or backed by revenues of similar types of projects.

When determining in which bond funds to invest, the investment adviser will predominately seek exposure to higher quality bonds (rated A- or better or A3 or better by Nationally Recognized Statistical Rating Organizations designated by the fund’s investment adviser, or unrated but determined by the fund’s investment adviser to be of equivalent quality) with intermediate to short-term durations. The fund may, however, invest in underlying funds with exposure to lower quality, higher yielding securities rated BBB+ or below and Baa1 or below (including those rated BB+ or below and Ba1 or below) or unrated but determined by the fund’s investment adviser to be of equivalent quality, and to bonds with longer durations.

The underlying funds may hold securities issued and guaranteed by the U.S. government, securities issued by federal agencies and instrumentalities and securities backed by mortgages or other assets.

The fund’s investment adviser seeks to create combinations of underlying funds that complement each other with a goal of achieving the fund’s investment objective of providing current income that is exempt from regular federal income tax, consistent with preservation of capital. In making this determination, the fund’s investment adviser considers the historical volatility and returns of the underlying funds and how various combinations would have behaved in past market environments. It also considers, among other topics, current market conditions and the investment positions of the underlying funds.

The fund’s investment adviser periodically reviews the investment strategies and asset mix of the underlying funds. The investment adviser will also consider whether overall market conditions would favor a change in the exposure of the fund to various types of bonds or geographic regions. Based on these considerations, the investment adviser may make adjustments to underlying fund holdings by adjusting the percentage of individual underlying funds within the fund, or adding or removing underlying funds. The investment adviser may also determine not to change the underlying fund allocations, particularly in response to short-term market movements, if in its opinion the combination of underlying funds is appropriate to meet the fund’s investment objective.

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 Short-Intermediate Municipal Debt Funds Index includes funds that disclose investment objectives and/or strategies reasonably comparable to those of the fund. Past investment results (before and after taxes) are not predictive of future investment results. 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. This information provides some indication of the risks of investing in the fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The Lipper Short-Intermediate Municipal Debt Funds Index includes 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 (before and after taxes) are not predictive of future investment results.
Bar Chart [Heading] rr_BarChartHeading Calendar year total returns for Class F-2 shares (Class F-2 shares are not subject to sales charges.)
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 Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads (Class F-2 shares are not subject to sales charges.)
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

Highest/Lowest quarterly results during this period were:

Highest 2.24% (quarter ended June 30, 2020)

Lowest -3.71% (quarter ended March 31, 2022)

The fund's total return for the nine months ended September 30, 2023, was -0.39%.

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 (0.39%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 2.24%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2022
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (3.71%)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the highest individual federal income tax rates in effect during each year of the periods shown and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Your actual after-tax returns depend on your individual tax situation and likely will differ from the results shown above. In addition, after-tax returns are not relevant if you hold your fund shares through a tax-deferred arrangement, such as a 401(k) plan, individual retirement account (IRA) or 529 college savings plan.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown only for Class F-2 shares; after-tax returns for other share classes will vary.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock

After-tax returns are shown only for Class F-2 shares; after-tax returns for other share classes will vary. After-tax returns are calculated using the highest individual federal income tax rates in effect during each year of the periods shown and do not reflect the impact of state and local taxes. Your actual after-tax returns depend on your individual tax situation and likely will differ from the results shown above. In addition, after-tax returns are not relevant if you hold your fund shares through a tax-deferred arrangement, such as a 401(k) plan, individual retirement account (IRA) or 529 college savings plan.

Average Annual Return, Caption rr_AverageAnnualReturnCaption Average annual total returns For the periods ended December 31, 2022:
American Funds Tax-Exempt Preservation Portfolio | Risk Not Insured [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Your investment in the fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency, entity or person.
American Funds Tax-Exempt Preservation Portfolio | Risk Lose Money [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock You may lose money by investing in the fund.
American Funds Tax-Exempt Preservation Portfolio | Allocation risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Allocation risk — Investments in the fund are subject to risks related to the investment adviser’s allocation choices. The selection of the underlying funds and the allocation of the fund’s assets could cause the fund to lose value or its results to lag relevant benchmarks or other funds with similar objectives.
American Funds Tax-Exempt Preservation Portfolio | Fund structure [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Fund structure — The fund invests in underlying funds and incurs expenses related to the underlying funds. In addition, investors in the fund will incur fees to pay for certain expenses related to the operations of the fund. An investor holding the underlying funds directly and in the same proportions as the fund would incur lower overall expenses but would not receive the benefit of the portfolio management and other services provided by the fund. Additionally, in accordance with an exemption under the Investment Company Act of 1940, as amended, the investment adviser considers only proprietary funds when selecting underlying investment options and allocations. This means that the fund’s investment adviser does not, nor does it expect to, consider any unaffiliated funds as underlying investment options for the fund. This strategy could raise certain conflicts of interest when determining the overall asset allocation of the fund or choosing underlying investments for the fund, including the selection of funds that result in greater compensation to the adviser or funds with relatively lower historical investment results. The investment adviser has policies and procedures designed to mitigate material conflicts of interest that may arise in connection with its management of the fund.
American Funds Tax-Exempt Preservation Portfolio | Underlying fund risks [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Underlying fund risks — Because the fund’s investments consist of underlying funds, the fund’s risks are directly related to the risks of the underlying funds. For this reason, it is important to understand the risks associated with investing in the underlying funds, as described below.
American Funds Tax-Exempt Preservation Portfolio | Market conditions [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Market conditions — The prices of, and the income generated by, the common stocks, bonds and other securities held by the underlying funds 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 underlying funds invest in securities of issuers located in or with significant exposure to the countries affected, the value and liquidity of the underlying funds’ investments may be negatively affected by developments in other countries and regions.
American Funds Tax-Exempt Preservation Portfolio | Issuer risks [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Issuer risks — The prices of, and the income generated by, securities held by the underlying funds may decline in response to various factors directly related to the issuers of such securities, including reduced demand for an issuer’s goods or services, poor management performance, major litigation, investigations or other controversies related to the issuer, changes in the issuer’s financial condition or credit rating, changes in government regulations affecting the issuer or its competitive environment and strategic initiatives such as mergers, acquisitions or dispositions and the market response to any such initiatives. An individual security may also be affected by factors relating to the industry or sector of the issuer or the securities markets as a whole, and conversely an industry or sector or the securities markets may be affected by a change in financial condition or other event affecting a single issuer.
American Funds Tax-Exempt Preservation Portfolio | Investing in debt instruments [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Investing in debt instruments — The prices of, and the income generated by, bonds and other debt securities held by an underlying fund may be affected by factors such as the interest rates, maturities and credit quality of these securities. Rising interest rates will generally cause the prices of bonds and other debt securities to fall. Also, when interest rates rise, issuers of debt securities which may be prepaid at any time, such as mortgage- or other asset-backed securities, are less likely to refinance existing debt securities, causing the average life of such securities to extend. A general change in interest rates may cause investors to sell debt securities on a large scale, which could also adversely affect the price and liquidity of debt securities and could also result in increased redemptions from the fund. Falling interest rates may cause an issuer to redeem, call or refinance a debt security before its stated maturity, which may result in the fund having to reinvest the proceeds in lower yielding securities. 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. Bonds and other debt securities are also subject to credit risk, which is the possibility that the credit strength of an issuer or guarantor will weaken or be perceived to be weaker, and/or an issuer of a debt security will fail to make timely payments of principal or interest and the security will go into default. Changes in actual or perceived creditworthiness may occur quickly. A downgrade or default affecting any of the underlying funds’ securities could cause the value of the underlying funds’ shares to decrease. Credit risk is gauged, in part, by the credit ratings of the debt securities in which the underlying fund invests. However, ratings are only the opinions of the rating agencies issuing them and are not guarantees as to credit quality or an evaluation of market risk. The underlying funds’ investment adviser relies on its own credit analysts to research issuers and issues in assessing credit and default risks.
American Funds Tax-Exempt Preservation Portfolio | Investing in municipal securities [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Investing in municipal securities — Municipal securities are debt obligations that are exempt from federal, state and/or local income taxes. The yield and/or value of the fund’s investments in municipal securities may be adversely affected by events tied to the municipal securities markets, which can be very volatile and significantly impacted by unfavorable legislative or political developments and negative changes in the financial conditions of municipal securities issuers and the economy. To the extent the fund invests in obligations of a municipal issuer, the volatility, credit quality and performance of the fund may be adversely impacted by local political and economic conditions of the issuer. For example, a credit rating downgrade, bond default or bankruptcy involving an issuer within a particular state or territory could affect the market values and marketability of many or all municipal obligations of that state or territory. Income from municipal securities held by the fund could also be declared taxable because of changes in tax laws or interpretations by taxing authorities or as a result of noncompliant conduct of a municipal issuer. Additionally, the relative amount of publicly available information about municipal securities is generally less than that for corporate securities.
American Funds Tax-Exempt Preservation Portfolio | Investing in similar municipal bonds [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Investing in similar municipal bonds — Investing significantly in municipal obligations of multiple issuers in the same state or backed by revenues of similar types of projects or industries may make an underlying fund more susceptible to certain economic, political or regulatory occurrences. As a result, the underlying fund has greater risk of volatility, and greater risk of loss, from these investments.
American Funds Tax-Exempt Preservation Portfolio | Liquidity risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Liquidity risk — Certain underlying fund holdings may be or may become difficult or impossible to sell, particularly during times of market turmoil. Liquidity may be impacted by the lack of an active market for a holding, legal or contractual restrictions on resale, or the reduced number and capacity of market participants to make a market in such holding. Market prices for less liquid or illiquid holdings may be volatile or difficult to determine, and reduced liquidity may have an adverse impact on the market price of such holdings. Additionally, the sale of less liquid or illiquid holdings may involve substantial delays (including delays in settlement) and additional costs and the underlying fund may be unable to sell such holdings when necessary to meet its liquidity needs or to try to limit losses, or may be forced to sell at a loss.
American Funds Tax-Exempt Preservation Portfolio | Credit and liquidity support [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Credit and liquidity support — Changes in the credit quality of banks and financial institutions providing credit and liquidity support features with respect to securities held by the underlying fund could cause the values of these securities to decline.
American Funds Tax-Exempt Preservation Portfolio | Management [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Management — The investment adviser to the fund and to the underlying funds actively manages each underlying fund’s investments. Consequently, the underlying funds are 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. This could cause an underlying fund to lose value or its investment results to lag relevant benchmarks or other funds with similar objectives.
American Funds Tax-Exempt Preservation Portfolio | Bloomberg Municipal Bond 1-7 Year Blend Index (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 (4.11%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.21%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 1.37%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 1.39%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate May 18, 2012
American Funds Tax-Exempt Preservation Portfolio | Lipper Short-Intermediate Municipal Debt Funds Index (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 (4.40%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.05%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 1.10%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 1.16%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate May 18, 2012
American Funds Tax-Exempt Preservation Portfolio | Class A  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 2.50%
Maximum deferred sales charge (load) (as a percentage of the amount redeemed) rr_MaximumDeferredSalesChargeOverOfferingPrice 0.75% [1]
Maximum sales charge (load) imposed on reinvested dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption or exchange fees rr_RedemptionFeeOverRedemption none
Management fees rr_ManagementFeesOverAssets none
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.30%
Other expenses rr_OtherExpensesOverAssets 0.04%
Acquired (underlying) fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.24%
Total annual fund operating expenses rr_ExpensesOverAssets 0.58%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock A contingent deferred sales charge of 0.75% applies on certain redemptions made within 18 months following purchases of $250,000 or more made without an initial sales charge. Contingent deferred sales charge is calculated based on the lesser of the offering price and market value of shares being sold.
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for a Class A sales charge discount if you and your family invest, or agree to invest in the future, at least $500,000 in American Funds.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 500,000
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 308
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 431
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 566
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 958
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (6.78%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 0.28%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 0.92%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 1.08%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate May 18, 2012
American Funds Tax-Exempt Preservation Portfolio | 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 none
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.04%
Acquired (underlying) fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.24%
Total annual fund operating expenses rr_ExpensesOverAssets 1.28%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 230
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 406
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 702
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,352
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 130
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 406
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 702
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,352
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (5.88%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 0.09%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 0.61%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 0.79%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate May 18, 2012
American Funds Tax-Exempt Preservation Portfolio | Class T  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 2.50%
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 none
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.04% [2]
Acquired (underlying) fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.24%
Total annual fund operating expenses rr_ExpensesOverAssets 0.53%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 303
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 416
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 539
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 898
American Funds Tax-Exempt Preservation Portfolio | 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 none
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.14%
Acquired (underlying) fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.24%
Total annual fund operating expenses rr_ExpensesOverAssets 0.63%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 64
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 $ 786
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (4.42%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 0.75%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 1.17%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 1.33%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate May 18, 2012
American Funds Tax-Exempt Preservation Portfolio | 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 none
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.11%
Acquired (underlying) fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.24%
Total annual fund operating expenses rr_ExpensesOverAssets 0.35%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 36
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 113
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 197
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 443
Annual Return 2013 rr_AnnualReturn2013 (0.77%)
Annual Return 2014 rr_AnnualReturn2014 5.30%
Annual Return 2015 rr_AnnualReturn2015 2.05%
Annual Return 2016 rr_AnnualReturn2016 0.09%
Annual Return 2017 rr_AnnualReturn2017 2.71%
Annual Return 2018 rr_AnnualReturn2018 1.16%
Annual Return 2019 rr_AnnualReturn2019 4.29%
Annual Return 2020 rr_AnnualReturn2020 3.86%
Annual Return 2021 rr_AnnualReturn2021 0.19%
Annual Return 2022 rr_AnnualReturn2022 (4.15%)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (4.15%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.02%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 1.44%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 1.59%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate May 18, 2012
American Funds Tax-Exempt Preservation Portfolio | Class F-2 | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (4.15%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 0.99%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 1.42%
American Funds Tax-Exempt Preservation Portfolio | Class F-2 | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (1.94%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.14%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 1.57%
American Funds Tax-Exempt Preservation Portfolio | 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 none
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.01%
Acquired (underlying) fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.24%
Total annual fund operating expenses rr_ExpensesOverAssets 0.25%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 26
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 80
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 141
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 318
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (4.04%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.13%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 1.36%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jan. 27, 2017
[1] A contingent deferred sales charge of 0.75% applies on certain redemptions made within 18 months following purchases of $250,000 or more made without an initial sales charge. Contingent deferred sales charge is calculated based on the lesser of the offering price and market value of shares being sold.
[2] Restated to reflect current fees.