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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName FIDELITY CHARLES STREET TRUST
09.30 Fidelity Asset Manager Funds AMCIZ Combo PRO-16 | Fidelity Asset Manager 50%  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Fund Summary Fund/Class:Fidelity Asset Manager® 50%/Fidelity Advisor Asset Manager® 50% A, M, C, I, Z
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The fund seeks high total return with reduced risk over the long term by allocating its assets among stocks, bonds, and short-term instruments.
Expense [Heading] rr_ExpenseHeading Fee Table
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund. In addition to the fees and expenses described below, your broker may also require you to pay brokerage commissions on purchases and sales of certain share classes of the fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or certain other Fidelity® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 50 of the prospectus. Different intermediaries may provide additional waivers or reductions of the sales charge. Please see “Sales Charge Waiver Policies Applied by Certain Intermediaries” in the “Appendix” section of the prospectus.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Operating Expenses (expenses that you pay each year as a % of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The fund pays 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 operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 17% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 17.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or certain other Fidelity® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 50 of the prospectus.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This example helps compare the cost of investing in the fund with the cost of investing in other funds. Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated and if you hold your shares:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock Allocating the fund's assets among three main asset classes: the stock class (equity securities of all types, including funds that invest in such securities), the bond class (fixed-income securities of all types maturing in more than one year, including lower-quality debt securities which are sometimes referred to as high yield debt securities or junk bonds, and funds that invest in such securities), and the short-term/money market class (fixed-income securities of all types maturing in one year or less, including funds that invest in such securities). Maintaining a neutral mix over time of 50% of assets in stocks, 40% of assets in bonds, and 10% of assets in short-term and money market instruments. Adjusting allocation among asset classes gradually within the following ranges: stock class (30%-70%), bond class (20%-60%), and short-term/money market class (0%-50%). Investing in domestic and foreign issuers. Investing in Fidelity's central funds (specialized investment vehicles used by Fidelity® funds to invest in particular security types or investment disciplines) consistent with the asset classes discussed above.
Risk [Heading] rr_RiskHeading Principal Investment Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments. Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease. Income Risk. A low or negative interest rate environment can adversely affect an underlying fund's yield. Foreign Exposure. Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. The extent of economic development; political stability; market depth, infrastructure, and capitalization; and regulatory oversight can be less than in more developed markets. Emerging markets typically have less established legal, accounting and financial reporting systems than those in more developed markets, which may reduce the scope or quality of financial information available to investors. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile. Prepayment. The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change. Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities and certain types of other securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments. An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in the fund.
Risk Lose Money [Text] rr_RiskLoseMoney You could lose money by investing in the fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance. Visit institutional.fidelity.com for more recent performance information.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress institutional.fidelity.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not an indication of future performance.
Bar Chart [Heading] rr_BarChartHeading Year-by-Year Returns
Bar Chart Narrative [Text Block] rr_BarChartNarrativeTextBlock The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.
Performance Table Heading rr_PerformanceTableHeading Average Annual Returns
Performance Table Does Reflect Sales Loads rr_PerformanceTableDoesReflectSalesLoads Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges.
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.
09.30 Fidelity Asset Manager Funds AMCIZ Combo PRO-16 | Fidelity Asset Manager 50% | Fidelity Advisor Asset Manager 50%: Class A  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) on purchases (as a % of offering price) rr_MaximumCumulativeSalesChargeOverOfferingPrice 5.75%
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none [1]
Management fee rr_ManagementFeesOverAssets 0.48%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.18%
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total annual operating expenses rr_ExpensesOverAssets 0.92% [2]
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.
1 year rr_ExpenseExampleYear01 $ 663
3 years rr_ExpenseExampleYear03 851
5 years rr_ExpenseExampleYear05 1,055
10 years rr_ExpenseExampleYear10 1,641
1 Year rr_ExpenseExampleNoRedemptionYear01 663
3 Years rr_ExpenseExampleNoRedemptionYear03 851
5 Years rr_ExpenseExampleNoRedemptionYear05 1,055
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,641
2011 rr_AnnualReturn2011 (1.02%)
2012 rr_AnnualReturn2012 11.05%
2013 rr_AnnualReturn2013 13.58%
2014 rr_AnnualReturn2014 5.18%
2015 rr_AnnualReturn2015 (0.75%)
2016 rr_AnnualReturn2016 6.07%
2017 rr_AnnualReturn2017 13.76%
2018 rr_AnnualReturn2018 (5.69%)
2019 rr_AnnualReturn2019 17.91%
2020 rr_AnnualReturn2020 14.36%
Year to Date Return, Label rr_YearToDateReturnLabel Year-to-Date Return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2021
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 6.18%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarter Return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 13.80%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarter Return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (11.91%)
09.30 Fidelity Asset Manager Funds AMCIZ Combo PRO-16 | Fidelity Asset Manager 50% | Fidelity Advisor Asset Manager 50%: Class M  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) on purchases (as a % of offering price) rr_MaximumCumulativeSalesChargeOverOfferingPrice 3.50%
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none [1]
Management fee rr_ManagementFeesOverAssets 0.48%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Other expenses rr_OtherExpensesOverAssets 0.17%
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total annual operating expenses rr_ExpensesOverAssets 1.16% [2]
1 year rr_ExpenseExampleYear01 $ 464
3 years rr_ExpenseExampleYear03 706
5 years rr_ExpenseExampleYear05 966
10 years rr_ExpenseExampleYear10 1,710
1 Year rr_ExpenseExampleNoRedemptionYear01 464
3 Years rr_ExpenseExampleNoRedemptionYear03 706
5 Years rr_ExpenseExampleNoRedemptionYear05 966
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,710
09.30 Fidelity Asset Manager Funds AMCIZ Combo PRO-16 | Fidelity Asset Manager 50% | Fidelity Advisor Asset Manager 50%: Class C  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) on purchases (as a % of offering price) rr_MaximumCumulativeSalesChargeOverOfferingPrice none
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther 1.00% [3]
Management fee rr_ManagementFeesOverAssets 0.48%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.19%
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total annual operating expenses rr_ExpensesOverAssets 1.68% [2]
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock On Class C shares redeemed less than one year after purchase.
1 year rr_ExpenseExampleYear01 $ 271
3 years rr_ExpenseExampleYear03 530
5 years rr_ExpenseExampleYear05 913
10 years rr_ExpenseExampleYear10 1,785
1 Year rr_ExpenseExampleNoRedemptionYear01 171
3 Years rr_ExpenseExampleNoRedemptionYear03 530
5 Years rr_ExpenseExampleNoRedemptionYear05 913
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,785
09.30 Fidelity Asset Manager Funds AMCIZ Combo PRO-16 | Fidelity Asset Manager 50% | Fidelity Advisor Asset Manager 50%: Class I  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) on purchases (as a % of offering price) rr_MaximumCumulativeSalesChargeOverOfferingPrice none
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none
Management fee rr_ManagementFeesOverAssets 0.48%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.16%
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total annual operating expenses rr_ExpensesOverAssets 0.65% [2]
1 year rr_ExpenseExampleYear01 $ 66
3 years rr_ExpenseExampleYear03 208
5 years rr_ExpenseExampleYear05 362
10 years rr_ExpenseExampleYear10 810
1 Year rr_ExpenseExampleNoRedemptionYear01 66
3 Years rr_ExpenseExampleNoRedemptionYear03 208
5 Years rr_ExpenseExampleNoRedemptionYear05 362
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 810
09.30 Fidelity Asset Manager Funds AMCIZ Combo PRO-16 | Fidelity Asset Manager 50% | Fidelity Advisor Asset Manager 50%: Class Z  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) on purchases (as a % of offering price) rr_MaximumCumulativeSalesChargeOverOfferingPrice none
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none
Management fee rr_ManagementFeesOverAssets 0.48%
Distribution and/or Service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.06%
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total annual operating expenses rr_ExpensesOverAssets 0.55% [2]
1 year rr_ExpenseExampleYear01 $ 56
3 years rr_ExpenseExampleYear03 176
5 years rr_ExpenseExampleYear05 307
10 years rr_ExpenseExampleYear10 689
1 Year rr_ExpenseExampleNoRedemptionYear01 56
3 Years rr_ExpenseExampleNoRedemptionYear03 176
5 Years rr_ExpenseExampleNoRedemptionYear05 307
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 689
09.30 Fidelity Asset Manager Funds AMCIZ Combo PRO-16 | Fidelity Asset Manager 50% | Return Before Taxes | Fidelity Advisor Asset Manager 50%: Class A  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Class A - Return Before Taxes
Past 1 year rr_AverageAnnualReturnYear01 7.79%
Past 5 years rr_AverageAnnualReturnYear05 7.66%
Past 10 years rr_AverageAnnualReturnYear10 6.54%
09.30 Fidelity Asset Manager Funds AMCIZ Combo PRO-16 | Fidelity Asset Manager 50% | Return Before Taxes | Fidelity Advisor Asset Manager 50%: Class M  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Class M - Return Before Taxes
Past 1 year rr_AverageAnnualReturnYear01 10.11%
Past 5 years rr_AverageAnnualReturnYear05 7.89%
Past 10 years rr_AverageAnnualReturnYear10 6.53%
09.30 Fidelity Asset Manager Funds AMCIZ Combo PRO-16 | Fidelity Asset Manager 50% | Return Before Taxes | Fidelity Advisor Asset Manager 50%: Class C  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Class C - Return Before Taxes
Past 1 year rr_AverageAnnualReturnYear01 12.44%
Past 5 years rr_AverageAnnualReturnYear05 8.11%
Past 10 years rr_AverageAnnualReturnYear10 6.37%
09.30 Fidelity Asset Manager Funds AMCIZ Combo PRO-16 | Fidelity Asset Manager 50% | Return Before Taxes | Fidelity Advisor Asset Manager 50%: Class I  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Class I - Return Before Taxes
Past 1 year rr_AverageAnnualReturnYear01 14.65%
Past 5 years rr_AverageAnnualReturnYear05 9.23%
Past 10 years rr_AverageAnnualReturnYear10 7.47%
09.30 Fidelity Asset Manager Funds AMCIZ Combo PRO-16 | Fidelity Asset Manager 50% | Return Before Taxes | Fidelity Advisor Asset Manager 50%: Class Z  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Class Z - Return Before Taxes
Past 1 year rr_AverageAnnualReturnYear01 14.79%
Past 10 years rr_AverageAnnualReturnYear10
Since Inception rr_AverageAnnualReturnSinceInception 10.52% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 02, 2018
09.30 Fidelity Asset Manager Funds AMCIZ Combo PRO-16 | Fidelity Asset Manager 50% | After Taxes on Distributions | Fidelity Advisor Asset Manager 50%: Class A  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
Past 1 year rr_AverageAnnualReturnYear01 7.03%
Past 5 years rr_AverageAnnualReturnYear05 6.61%
Past 10 years rr_AverageAnnualReturnYear10 5.35%
09.30 Fidelity Asset Manager Funds AMCIZ Combo PRO-16 | Fidelity Asset Manager 50% | After Taxes on Distributions and Sales | Fidelity Advisor Asset Manager 50%: Class A  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares
Past 1 year rr_AverageAnnualReturnYear01 4.78%
Past 5 years rr_AverageAnnualReturnYear05 5.69%
Past 10 years rr_AverageAnnualReturnYear10 4.83%
09.30 Fidelity Asset Manager Funds AMCIZ Combo PRO-16 | Fidelity Asset Manager 50% | SP001  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel S&P 500® Index
Past 1 year rr_AverageAnnualReturnYear01 18.40%
Past 5 years rr_AverageAnnualReturnYear05 15.22%
Past 10 years rr_AverageAnnualReturnYear10 13.88%
09.30 Fidelity Asset Manager Funds AMCIZ Combo PRO-16 | Fidelity Asset Manager 50% | F0001  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Fidelity Asset Manager 50% Composite Index℠
Past 1 year rr_AverageAnnualReturnYear01 12.71%
Past 5 years rr_AverageAnnualReturnYear05 8.89%
Past 10 years rr_AverageAnnualReturnYear10 7.55%
[1]

(a)Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

[2]

(a)Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.

[3]

(b)On Class C shares redeemed less than one year after purchase.

[4]

(a)Since inception October 2, 2018.