XML 150 R28.htm IDEA: XBRL DOCUMENT v3.25.3
Investment Risks
Nov. 29, 2025
FidelityHealthSavingsFunds-RetailComboPRO | Fidelity Health Savings Fund | Risk Lose Money [Member]  
Prospectus Line Items  
Risk [Text Block]   You could lose money by investing in the fund.
FidelityHealthSavingsFunds-RetailComboPRO | Fidelity Health Savings Fund | Risk Not Insured Depository Institution [Member]  
Prospectus Line Items  
Risk [Text Block] 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 .
FidelityHealthSavingsFunds-RetailComboPRO | Fidelity Health Savings Fund | IncomeRiskMember  
Prospectus Line Items  
Risk [Text Block] Income Risk. A low or negative interest rate environment can adversely affect an underlying fund's yield.
FidelityHealthSavingsFunds-RetailComboPRO | Fidelity Health Savings Fund | GeographicExposureToThePacificBasinMember  
Prospectus Line Items  
Risk [Text Block] Geographic Exposure to the Pacific Basin. Because an underlying fund invests a meaningful portion of its assets in the Pacific Basin, the underlying fund's performance is expected to be closely tied to social, political, and economic conditions within the Pacific Basin and to be more volatile than the performance of more geographically diversified funds.
FidelityHealthSavingsFunds-RetailComboPRO | Fidelity Health Savings Fund | AssetAllocationRiskMember  
Prospectus Line Items  
Risk [Text Block] Asset Allocation Risk. The fund is subject to risks resulting from the Adviser's asset allocation decisions. The selection of underlying funds and the allocation of the fund's assets among various asset classes could cause the fund to lose value or its results to lag relevant benchmarks or other funds with similar objectives.
FidelityHealthSavingsFunds-RetailComboPRO | Fidelity Health Savings Fund | CorrelationToIndexMember  
Prospectus Line Items  
Risk [Text Block] Correlation to Index. The performance of an underlying index fund and its index may vary somewhat due to factors such as fees and expenses of the underlying fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on an underlying fund and its shareholders.
FidelityHealthSavingsFunds-RetailComboPRO | Fidelity Health Savings Fund | InterestRateChangesMember  
Prospectus Line Items  
Risk [Text Block] Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.
FidelityHealthSavingsFunds-RetailComboPRO | Fidelity Health Savings Fund | ForeignCurrencyTransactionsMember  
Prospectus Line Items  
Risk [Text Block] Foreign Currency Transactions. Although a forward foreign currency exchange contract is used to reduce or hedge a fund's exposure to changes in the value of the currency, suitable hedging transactions may not be available in all circumstances, may not be successful, and may eliminate any chance for the fund to benefit from favorable fluctuations in relevant foreign currencies.
FidelityHealthSavingsFunds-RetailComboPRO | Fidelity Health Savings Fund | CommodityLinkedInvestingMember  
Prospectus Line Items  
Risk [Text Block] Commodity-Linked Investing. The value of commodities and commodity-linked investments may be affected by the performance of the overall commodities markets as well as weather, political, tax, and other regulatory and market developments. Commodity-linked investments may be more volatile and less liquid than the underlying commodity, instruments, or measures.
FidelityHealthSavingsFunds-RetailComboPRO | Fidelity Health Savings Fund | PrepaymentMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityHealthSavingsFunds-RetailComboPRO | Fidelity Health Savings Fund | GeographicExposureToEuropeMember  
Prospectus Line Items  
Risk [Text Block] Geographic Exposure to Europe. Because an underlying fund invests a meaningful portion of its assets in Europe, the underlying fund's performance is expected to be closely tied to social, political, and economic conditions within Europe and to be more volatile than the performance of more geographically diversified funds.
FidelityHealthSavingsFunds-RetailComboPRO | Fidelity Health Savings Fund | InflationProtectedDebtExposureMember  
Prospectus Line Items  
Risk [Text Block] Inflation-Protected Debt Exposure. Increases in real interest rates can cause the price of inflation-protected debt securities to decrease. Interest payments on inflation-protected debt securities can be unpredictable.
FidelityHealthSavingsFunds-RetailComboPRO | Fidelity Health Savings Fund | LeverageRiskMember  
Prospectus Line Items  
Risk [Text Block] Leverage Risk. Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly.
FidelityHealthSavingsFunds-RetailComboPRO | Fidelity Health Savings Fund | InvestingInOtherFundsMember  
Prospectus Line Items  
Risk [Text Block] Investing in Other Funds. The fund bears all risks of investment strategies employed by the underlying funds, including the risk that the underlying funds will not meet their investment objectives.
FidelityHealthSavingsFunds-RetailComboPRO | Fidelity Health Savings Fund | IndustryExposureMember  
Prospectus Line Items  
Risk [Text Block] Industry Exposure. Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries.
FidelityHealthSavingsFunds-RetailComboPRO | Fidelity Health Savings Fund | IssuerSpecificChangesMember  
Prospectus Line Items  
Risk [Text Block] 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. A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease. 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 and can be difficult to resell.
FidelityHealthSavingsFunds-RetailComboPRO | Fidelity Health Savings Fund | StockMarketVolatilityMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityHealthSavingsFunds-RetailComboPRO | Fidelity Health Savings Fund | CommodityFuturesMember  
Prospectus Line Items  
Risk [Text Block] Commodity Futures. Investments in commodity futures contracts are also subject to the risk of the failure of any of the exchanges on which an underlying fund's positions trade or of its clearinghouses or counterparties. In addition, certain commodity exchanges limit fluctuations in certain futures contract prices during a single day by regulations referred to as "daily price fluctuation limits" or "daily limits." Under such daily limits, during a single trading day no trades may be executed at prices beyond the daily limit. If triggered, these limits could prevent the underlying fund from liquidating unfavorable positions and subject the underlying fund to losses or prevent it from entering into desired trades during the particular trading day.
FidelityHealthSavingsFunds-RetailComboPRO | Fidelity Health Savings Fund | InvestingInEtfsMember  
Prospectus Line Items  
Risk [Text Block] Investing in Exchange Traded Funds (ETFs). ETFs may trade in the secondary market at prices below the value of their underlying portfolios and may not be liquid. ETFs that track an index are subject to tracking error and may be unable to sell poorly performing assets that are included in their index or other benchmark.
FidelityHealthSavingsFunds-RetailComboPRO | Fidelity Health Savings Fund | ForeignExposureMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityHealthSavingsFunds-RetailComboPRO | Fidelity Health Savings Fund | PassiveManagementRiskMember  
Prospectus Line Items  
Risk [Text Block] Passive Management Risk. Some of the underlying funds in which the fund invests are managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of an underlying fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the performance of these underlying funds could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers. An underlying index fund may be concentrated to approximately the same extent that its index concentrates in the securities of issuers in a particular industry or group of industries.
FidelityHealthSavingsFunds-RetailComboPRO | Fidelity Health Savings Index Fund | Risk Lose Money [Member]  
Prospectus Line Items  
Risk [Text Block]   You could lose money by investing in the fund.
FidelityHealthSavingsFunds-RetailComboPRO | Fidelity Health Savings Index Fund | Risk Not Insured Depository Institution [Member]  
Prospectus Line Items  
Risk [Text Block] 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 .
FidelityHealthSavingsFunds-RetailComboPRO | Fidelity Health Savings Index Fund | IncomeRiskMember  
Prospectus Line Items  
Risk [Text Block] Income Risk. A low or negative interest rate environment can adversely affect an underlying fund's yield.
FidelityHealthSavingsFunds-RetailComboPRO | Fidelity Health Savings Index Fund | AssetAllocationRiskMember  
Prospectus Line Items  
Risk [Text Block] Asset Allocation Risk. The fund is subject to risks resulting from the Adviser's asset allocation decisions. The selection of underlying funds and the allocation of the fund's assets among various asset classes could cause the fund to lose value or its results to lag relevant benchmarks or other funds with similar objectives.
FidelityHealthSavingsFunds-RetailComboPRO | Fidelity Health Savings Index Fund | CorrelationToIndexMember  
Prospectus Line Items  
Risk [Text Block] Correlation to Index. The performance of an underlying index fund and its index may vary somewhat due to factors such as fees and expenses of the underlying fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on an underlying fund and its shareholders.
FidelityHealthSavingsFunds-RetailComboPRO | Fidelity Health Savings Index Fund | InterestRateChangesMember  
Prospectus Line Items  
Risk [Text Block] Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.
FidelityHealthSavingsFunds-RetailComboPRO | Fidelity Health Savings Index Fund | ForeignCurrencyTransactionsMember  
Prospectus Line Items  
Risk [Text Block] Foreign Currency Transactions. Although a forward foreign currency exchange contract is used to reduce or hedge a fund's exposure to changes in the value of the currency, suitable hedging transactions may not be available in all circumstances, may not be successful, and may eliminate any chance for the fund to benefit from favorable fluctuations in relevant foreign currencies.
FidelityHealthSavingsFunds-RetailComboPRO | Fidelity Health Savings Index Fund | CommodityLinkedInvestingMember  
Prospectus Line Items  
Risk [Text Block] Commodity-Linked Investing. The value of commodities and commodity-linked investments may be affected by the performance of the overall commodities markets as well as weather, political, tax, and other regulatory and market developments. Commodity-linked investments may be more volatile and less liquid than the underlying commodity, instruments, or measures.
FidelityHealthSavingsFunds-RetailComboPRO | Fidelity Health Savings Index Fund | PrepaymentMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityHealthSavingsFunds-RetailComboPRO | Fidelity Health Savings Index Fund | GeographicExposureToEuropeMember  
Prospectus Line Items  
Risk [Text Block] Geographic Exposure to Europe. Because an underlying fund invests a meaningful portion of its assets in Europe, the underlying fund's performance is expected to be closely tied to social, political, and economic conditions within Europe and to be more volatile than the performance of more geographically diversified funds.
FidelityHealthSavingsFunds-RetailComboPRO | Fidelity Health Savings Index Fund | InflationProtectedDebtExposureMember  
Prospectus Line Items  
Risk [Text Block] Inflation-Protected Debt Exposure. Increases in real interest rates can cause the price of inflation-protected debt securities to decrease. Interest payments on inflation-protected debt securities can be unpredictable.
FidelityHealthSavingsFunds-RetailComboPRO | Fidelity Health Savings Index Fund | LeverageRiskMember  
Prospectus Line Items  
Risk [Text Block] Leverage Risk. Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly.
FidelityHealthSavingsFunds-RetailComboPRO | Fidelity Health Savings Index Fund | InvestingInOtherFundsMember  
Prospectus Line Items  
Risk [Text Block] Investing in Other Funds. The fund bears all risks of investment strategies employed by the underlying funds, including the risk that the underlying funds will not meet their investment objectives.
FidelityHealthSavingsFunds-RetailComboPRO | Fidelity Health Savings Index Fund | IndustryExposureMember  
Prospectus Line Items  
Risk [Text Block] Industry Exposure. Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries.
FidelityHealthSavingsFunds-RetailComboPRO | Fidelity Health Savings Index Fund | GeographicExposureToJapanMember  
Prospectus Line Items  
Risk [Text Block] Geographic Exposure to Japan. Because an underlying fund invests a meaningful portion of its assets in Japan, the underlying fund's performance is expected to be closely tied to social, political, and economic conditions within Japan and to be more volatile than the performance of more geographically diversified funds.
FidelityHealthSavingsFunds-RetailComboPRO | Fidelity Health Savings Index Fund | IssuerSpecificChangesMember  
Prospectus Line Items  
Risk [Text Block] 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. Changes in the financial condition of an issuer or counterparty (e.g., broker-dealer or other borrower in a securities lending transaction) can increase the risk of default by an issuer or counterparty, which can affect a security's or instrument's value or result in delays in recovering securities and/or capital from a counterparty. A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease. 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.
FidelityHealthSavingsFunds-RetailComboPRO | Fidelity Health Savings Index Fund | StockMarketVolatilityMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityHealthSavingsFunds-RetailComboPRO | Fidelity Health Savings Index Fund | CommodityFuturesMember  
Prospectus Line Items  
Risk [Text Block] Commodity Futures. Investments in commodity futures contracts are also subject to the risk of the failure of any of the exchanges on which an underlying fund's positions trade or of its clearinghouses or counterparties. In addition, certain commodity exchanges limit fluctuations in certain futures contract prices during a single day by regulations referred to as "daily price fluctuation limits" or "daily limits." Under such daily limits, during a single trading day no trades may be executed at prices beyond the daily limit. If triggered, these limits could prevent the underlying fund from liquidating unfavorable positions and subject the underlying fund to losses or prevent it from entering into desired trades during the particular trading day.
FidelityHealthSavingsFunds-RetailComboPRO | Fidelity Health Savings Index Fund | SecuritiesLendingRiskMember  
Prospectus Line Items  
Risk [Text Block] Securities Lending Risk. Securities lending involves the risk that the borrower may fail to return the securities loaned in a timely manner or at all. If the borrower defaults on its obligation to return the securities loaned because of insolvency or other reasons, an underlying fund could experience delays and costs in recovering the securities loaned or in gaining access to the collateral.
FidelityHealthSavingsFunds-RetailComboPRO | Fidelity Health Savings Index Fund | InvestingInEtfsMember  
Prospectus Line Items  
Risk [Text Block] Investing in Exchange Traded Funds (ETFs). ETFs may trade in the secondary market at prices below the value of their underlying portfolios and may not be liquid. ETFs that track an index are subject to tracking error and may be unable to sell poorly performing assets that are included in their index or other benchmark.
FidelityHealthSavingsFunds-RetailComboPRO | Fidelity Health Savings Index Fund | ForeignExposureMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityHealthSavingsFunds-RetailComboPRO | Fidelity Health Savings Index Fund | PassiveManagementRiskMember  
Prospectus Line Items  
Risk [Text Block] Passive Management Risk. Some of the underlying funds in which the fund invests are managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of an underlying fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the performance of these underlying funds could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers. An underlying index fund may be concentrated to approximately the same extent that its index concentrates in the securities of issuers in a particular industry or group of industries.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 20% | Risk Lose Money [Member]  
Prospectus Line Items  
Risk [Text Block]   You could lose money by investing in the fund.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 20% | Risk Not Insured Depository Institution [Member]  
Prospectus Line Items  
Risk [Text Block] 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 .
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 20% | IncomeRiskMember  
Prospectus Line Items  
Risk [Text Block] Income Risk. A low or negative interest rate environment can adversely affect an underlying fund's yield.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 20% | InterestRateChangesMember  
Prospectus Line Items  
Risk [Text Block] Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 20% | PrepaymentMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 20% | IssuerSpecificChangesMember  
Prospectus Line Items  
Risk [Text Block] 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. A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease. 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.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 20% | StockMarketVolatilityMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 20% | InvestingInEtfsMember  
Prospectus Line Items  
Risk [Text Block] Investing in Exchange Traded Funds (ETFs). ETFs may trade in the secondary market at prices below the value of their underlying portfolios and may not be liquid. ETFs that track an index are subject to tracking error and may be unable to sell poorly performing assets that are included in their index or other benchmark.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 20% | ForeignExposureMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 30% | Risk Lose Money [Member]  
Prospectus Line Items  
Risk [Text Block]   You could lose money by investing in the fund.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 30% | Risk Not Insured Depository Institution [Member]  
Prospectus Line Items  
Risk [Text Block] 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 .
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 30% | IncomeRiskMember  
Prospectus Line Items  
Risk [Text Block] Income Risk. A low or negative interest rate environment can adversely affect an underlying fund's yield.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 30% | InterestRateChangesMember  
Prospectus Line Items  
Risk [Text Block] Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 30% | PrepaymentMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 30% | IssuerSpecificChangesMember  
Prospectus Line Items  
Risk [Text Block] 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. A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease. 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.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 30% | StockMarketVolatilityMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 30% | InvestingInEtfsMember  
Prospectus Line Items  
Risk [Text Block] Investing in Exchange Traded Funds (ETFs). ETFs may trade in the secondary market at prices below the value of their underlying portfolios and may not be liquid. ETFs that track an index are subject to tracking error and may be unable to sell poorly performing assets that are included in their index or other benchmark.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 30% | ForeignExposureMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 40% | Risk Lose Money [Member]  
Prospectus Line Items  
Risk [Text Block]   You could lose money by investing in the fund.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 40% | Risk Not Insured Depository Institution [Member]  
Prospectus Line Items  
Risk [Text Block] 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 .
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 40% | IncomeRiskMember  
Prospectus Line Items  
Risk [Text Block] Income Risk. A low or negative interest rate environment can adversely affect an underlying fund's yield.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 40% | GeographicExposureToThePacificBasinMember  
Prospectus Line Items  
Risk [Text Block] Geographic Exposure to the Pacific Basin. Because an underlying fund invests a meaningful portion of its assets in the Pacific Basin, the underlying fund's performance is expected to be closely tied to social, political, and economic conditions within the Pacific Basin and to be more volatile than the performance of more geographically diversified funds.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 40% | InterestRateChangesMember  
Prospectus Line Items  
Risk [Text Block] Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 40% | PrepaymentMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 40% | GeographicExposureToEuropeMember  
Prospectus Line Items  
Risk [Text Block] Geographic Exposure to Europe. Because an underlying fund invests a meaningful portion of its assets in Europe, the underlying fund's performance is expected to be closely tied to social, political, and economic conditions within Europe and to be more volatile than the performance of more geographically diversified funds.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 40% | IssuerSpecificChangesMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 40% | StockMarketVolatilityMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 40% | InvestingInEtfsMember  
Prospectus Line Items  
Risk [Text Block] Investing in Exchange Traded Funds (ETFs). ETFs may trade in the secondary market at prices below the value of their underlying portfolios and may not be liquid. ETFs that track an index are subject to tracking error and may be unable to sell poorly performing assets that are included in their index or other benchmark.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 40% | ForeignExposureMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 50% | Risk Lose Money [Member]  
Prospectus Line Items  
Risk [Text Block]   You could lose money by investing in the fund.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 50% | Risk Not Insured Depository Institution [Member]  
Prospectus Line Items  
Risk [Text Block] 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 .
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 50% | IncomeRiskMember  
Prospectus Line Items  
Risk [Text Block] Income Risk. A low or negative interest rate environment can adversely affect an underlying fund's yield.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 50% | GeographicExposureToThePacificBasinMember  
Prospectus Line Items  
Risk [Text Block] Geographic Exposure to the Pacific Basin. Because an underlying fund invests a meaningful portion of its assets in the Pacific Basin, the underlying fund's performance is expected to be closely tied to social, political, and economic conditions within the Pacific Basin and to be more volatile than the performance of more geographically diversified funds.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 50% | InterestRateChangesMember  
Prospectus Line Items  
Risk [Text Block] Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 50% | PrepaymentMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 50% | GeographicExposureToEuropeMember  
Prospectus Line Items  
Risk [Text Block] Geographic Exposure to Europe. Because an underlying fund invests a meaningful portion of its assets in Europe, the underlying fund's performance is expected to be closely tied to social, political, and economic conditions within Europe and to be more volatile than the performance of more geographically diversified funds.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 50% | IssuerSpecificChangesMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 50% | StockMarketVolatilityMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 50% | InvestingInEtfsMember  
Prospectus Line Items  
Risk [Text Block] Investing in Exchange Traded Funds (ETFs). ETFs may trade in the secondary market at prices below the value of their underlying portfolios and may not be liquid. ETFs that track an index are subject to tracking error and may be unable to sell poorly performing assets that are included in their index or other benchmark.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 50% | ForeignExposureMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 60% | Risk Lose Money [Member]  
Prospectus Line Items  
Risk [Text Block]   You could lose money by investing in the fund.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 60% | Risk Not Insured Depository Institution [Member]  
Prospectus Line Items  
Risk [Text Block] 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 .
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 60% | IncomeRiskMember  
Prospectus Line Items  
Risk [Text Block] Income Risk. A low or negative interest rate environment can adversely affect an underlying fund's yield.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 60% | GeographicExposureToThePacificBasinMember  
Prospectus Line Items  
Risk [Text Block] Geographic Exposure to the Pacific Basin. Because an underlying fund invests a meaningful portion of its assets in the Pacific Basin, the underlying fund's performance is expected to be closely tied to social, political, and economic conditions within the Pacific Basin and to be more volatile than the performance of more geographically diversified funds.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 60% | InterestRateChangesMember  
Prospectus Line Items  
Risk [Text Block] Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 60% | PrepaymentMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 60% | GeographicExposureToEuropeMember  
Prospectus Line Items  
Risk [Text Block] Geographic Exposure to Europe. Because an underlying fund invests a meaningful portion of its assets in Europe, the underlying fund's performance is expected to be closely tied to social, political, and economic conditions within Europe and to be more volatile than the performance of more geographically diversified funds.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 60% | IssuerSpecificChangesMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 60% | StockMarketVolatilityMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 60% | InvestingInEtfsMember  
Prospectus Line Items  
Risk [Text Block] Investing in Exchange Traded Funds (ETFs). ETFs may trade in the secondary market at prices below the value of their underlying portfolios and may not be liquid. ETFs that track an index are subject to tracking error and may be unable to sell poorly performing assets that are included in their index or other benchmark.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 60% | ForeignExposureMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 70% | Risk Lose Money [Member]  
Prospectus Line Items  
Risk [Text Block]   You could lose money by investing in the fund.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 70% | Risk Not Insured Depository Institution [Member]  
Prospectus Line Items  
Risk [Text Block] 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 .
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 70% | IncomeRiskMember  
Prospectus Line Items  
Risk [Text Block] Income Risk. A low or negative interest rate environment can adversely affect an underlying fund's yield.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 70% | GeographicExposureToThePacificBasinMember  
Prospectus Line Items  
Risk [Text Block] Geographic Exposure to the Pacific Basin. Because an underlying fund invests a meaningful portion of its assets in the Pacific Basin, the underlying fund's performance is expected to be closely tied to social, political, and economic conditions within the Pacific Basin and to be more volatile than the performance of more geographically diversified funds.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 70% | InterestRateChangesMember  
Prospectus Line Items  
Risk [Text Block] Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 70% | PrepaymentMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 70% | GeographicExposureToEuropeMember  
Prospectus Line Items  
Risk [Text Block] Geographic Exposure to Europe. Because an underlying fund invests a meaningful portion of its assets in Europe, the underlying fund's performance is expected to be closely tied to social, political, and economic conditions within Europe and to be more volatile than the performance of more geographically diversified funds.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 70% | IssuerSpecificChangesMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 70% | StockMarketVolatilityMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 70% | InvestingInEtfsMember  
Prospectus Line Items  
Risk [Text Block] Investing in Exchange Traded Funds (ETFs). ETFs may trade in the secondary market at prices below the value of their underlying portfolios and may not be liquid. ETFs that track an index are subject to tracking error and may be unable to sell poorly performing assets that are included in their index or other benchmark.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 70% | ForeignExposureMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 85% | Risk Lose Money [Member]  
Prospectus Line Items  
Risk [Text Block]   You could lose money by investing in the fund.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 85% | Risk Not Insured Depository Institution [Member]  
Prospectus Line Items  
Risk [Text Block] 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 .
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 85% | IncomeRiskMember  
Prospectus Line Items  
Risk [Text Block] Income Risk. A low or negative interest rate environment can adversely affect an underlying fund's yield.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 85% | GeographicExposureToThePacificBasinMember  
Prospectus Line Items  
Risk [Text Block] Geographic Exposure to the Pacific Basin. Because an underlying fund invests a meaningful portion of its assets in the Pacific Basin, the underlying fund's performance is expected to be closely tied to social, political, and economic conditions within the Pacific Basin and to be more volatile than the performance of more geographically diversified funds.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 85% | GeographicExposureToTheChinaRegionMember  
Prospectus Line Items  
Risk [Text Block] Geographic Exposure to the China Region. Because an underlying fund invests a meaningful portion of its assets in the China region, the underlying fund's performance is expected to be closely tied to social, political, and economic conditions within the China region and to be more volatile than the performance of more geographically diversified funds. In addition, because the underlying fund may invest a significant percentage of assets in certain industries, the underlying fund's performance could be affected to the extent that the particular industry or industries in which the underlying fund invests are sensitive to adverse social, political, economic, currency, or regulatory developments.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 85% | InterestRateChangesMember  
Prospectus Line Items  
Risk [Text Block] Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 85% | PrepaymentMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 85% | GeographicExposureToEuropeMember  
Prospectus Line Items  
Risk [Text Block] Geographic Exposure to Europe. Because an underlying fund invests a meaningful portion of its assets in Europe, the underlying fund's performance is expected to be closely tied to social, political, and economic conditions within Europe and to be more volatile than the performance of more geographically diversified funds.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 85% | GeographicExposureToAsiaMember  
Prospectus Line Items  
Risk [Text Block] Geographic Exposure to Asia. Because an underlying fund invests a meaningful portion of its assets in Asia, the underlying fund's performance is expected to be closely tied to social, political, and economic conditions within Asia and to be more volatile than the performance of more geographically diversified funds.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 85% | IssuerSpecificChangesMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 85% | StockMarketVolatilityMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 85% | InvestingInEtfsMember  
Prospectus Line Items  
Risk [Text Block] Investing in Exchange Traded Funds (ETFs). ETFs may trade in the secondary market at prices below the value of their underlying portfolios and may not be liquid. ETFs that track an index are subject to tracking error and may be unable to sell poorly performing assets that are included in their index or other benchmark.
FidelityAssetManagerFunds-RetailComboPRO | Fidelity Asset Manager 85% | ForeignExposureMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelitySustainableMulti-AssetFund-RetailPRO | Fidelity Sustainable Multi-Asset Fund | Risk Lose Money [Member]  
Prospectus Line Items  
Risk [Text Block]   You could lose money by investing in the fund.
FidelitySustainableMulti-AssetFund-RetailPRO | Fidelity Sustainable Multi-Asset Fund | Risk Not Insured Depository Institution [Member]  
Prospectus Line Items  
Risk [Text Block] 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 .
FidelitySustainableMulti-AssetFund-RetailPRO | Fidelity Sustainable Multi-Asset Fund | AssetAllocationRiskMember  
Prospectus Line Items  
Risk [Text Block] Asset Allocation Risk. The fund is subject to risks resulting from the Adviser's asset allocation decisions. The selection of underlying funds and the allocation of the fund's assets among various asset classes could cause the fund to lose value or its results to lag relevant benchmarks or other funds with similar objectives.
FidelitySustainableMulti-AssetFund-RetailPRO | Fidelity Sustainable Multi-Asset Fund | CorrelationToIndexMember  
Prospectus Line Items  
Risk [Text Block] Correlation to Index. The performance of an underlying index fund and its index may vary somewhat due to factors such as fees and expenses of the underlying fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on an underlying fund and its shareholders.
FidelitySustainableMulti-AssetFund-RetailPRO | Fidelity Sustainable Multi-Asset Fund | InterestRateChangesMember  
Prospectus Line Items  
Risk [Text Block] Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.
FidelitySustainableMulti-AssetFund-RetailPRO | Fidelity Sustainable Multi-Asset Fund | PrepaymentMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelitySustainableMulti-AssetFund-RetailPRO | Fidelity Sustainable Multi-Asset Fund | SustainabilityRiskMember  
Prospectus Line Items  
Risk [Text Block] Sustainability Risk. Application of Fidelity Management & Research Company LLC's (FMR) (the Adviser) ESG ratings process and/or its sustainable investing exclusion criteria may affect the fund's exposure to certain issuers, sectors, regions, and countries and may affect the fund's performance depending on whether certain investments are in or out of favor. The criteria related to the fund's ESG ratings process and/or adherence to its sustainable investing exclusion criteria may result in the fund forgoing opportunities to buy certain securities when it might otherwise be advantageous to do so, or selling securities for ESG reasons when it might be otherwise disadvantageous for it to do so. As a result, the fund's performance may at times be better or worse than the performance of funds that do not use ESG or sustainability criteria. There are significant differences in interpretations of what it means for an issuer to have positive ESG factors. While the Adviser believes its definitions are reasonable, the portfolio decisions it makes may differ with other investors' or advisers' views. When evaluating an issuer, the Adviser is dependent on information or data obtained through voluntary or third-party reporting that may be incomplete, inaccurate, or unavailable, which could cause the Adviser to incorrectly assess an issuer's business practices.
FidelitySustainableMulti-AssetFund-RetailPRO | Fidelity Sustainable Multi-Asset Fund | GeographicExposureToEuropeMember  
Prospectus Line Items  
Risk [Text Block] Geographic Exposure to Europe. Because an underlying fund invests a meaningful portion of its assets in Europe, the underlying fund's performance is expected to be closely tied to social, political, and economic conditions within Europe and to be more volatile than the performance of more geographically diversified funds.
FidelitySustainableMulti-AssetFund-RetailPRO | Fidelity Sustainable Multi-Asset Fund | GeographicExposureToAsiaMember  
Prospectus Line Items  
Risk [Text Block] Geographic Exposure to Asia. Because an underlying fund invests a meaningful portion of its assets in Asia, the underlying fund's performance is expected to be closely tied to social, political, and economic conditions within Asia and to be more volatile than the performance of more geographically diversified funds.
FidelitySustainableMulti-AssetFund-RetailPRO | Fidelity Sustainable Multi-Asset Fund | ForeignAndEmergingMarketsRiskMember  
Prospectus Line Items  
Risk [Text Block] Foreign and Emerging Markets Risk. 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.
FidelitySustainableMulti-AssetFund-RetailPRO | Fidelity Sustainable Multi-Asset Fund | LeverageRiskMember  
Prospectus Line Items  
Risk [Text Block] Leverage Risk. Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly.
FidelitySustainableMulti-AssetFund-RetailPRO | Fidelity Sustainable Multi-Asset Fund | InvestingInOtherFundsMember  
Prospectus Line Items  
Risk [Text Block] Investing in Other Funds. The fund bears all risks of investment strategies employed by the underlying funds, including the risk that the underlying funds will not meet their investment objectives.
FidelitySustainableMulti-AssetFund-RetailPRO | Fidelity Sustainable Multi-Asset Fund | GeographicExposureToJapanMember  
Prospectus Line Items  
Risk [Text Block] Geographic Exposure to Japan. Because an underlying fund invests a meaningful portion of its assets in Japan, the underlying fund's performance is expected to be closely tied to social, political, and economic conditions within Japan and to be more volatile than the performance of more geographically diversified funds.
FidelitySustainableMulti-AssetFund-RetailPRO | Fidelity Sustainable Multi-Asset Fund | IssuerSpecificChangesMember  
Prospectus Line Items  
Risk [Text Block] 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. Changes in the financial condition of an issuer or counterparty (e.g., broker-dealer or other borrower in a securities lending transaction) can increase the risk of default by an issuer or counterparty, which can affect a security's or instrument's value or result in delays in recovering securities and/or capital from a counterparty. A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease.
FidelitySustainableMulti-AssetFund-RetailPRO | Fidelity Sustainable Multi-Asset Fund | StockMarketVolatilityMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelitySustainableMulti-AssetFund-RetailPRO | Fidelity Sustainable Multi-Asset Fund | InvestingInEtfsMember  
Prospectus Line Items  
Risk [Text Block] Investing in ETFs. ETFs may trade in the secondary market at prices below the value of their underlying portfolios and may not be liquid. ETFs that track an index are subject to tracking error and may be unable to sell poorly performing assets that are included in their index or other benchmark.
FidelitySustainableMulti-AssetFund-RetailPRO | Fidelity Sustainable Multi-Asset Fund | PassiveManagementRiskMember  
Prospectus Line Items  
Risk [Text Block] Passive Management Risk. Some of the underlying funds in which the fund invests are managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of an underlying fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the performance of these underlying funds could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers. An underlying index fund may be concentrated to approximately the same extent that its index concentrates in the securities of issuers in a particular industry or group of industries.
FidelityHealthSavingsFund-KPRO | Fidelity Health Savings Fund | Risk Lose Money [Member]  
Prospectus Line Items  
Risk [Text Block]   You could lose money by investing in the fund.
FidelityHealthSavingsFund-KPRO | Fidelity Health Savings Fund | Risk Not Insured Depository Institution [Member]  
Prospectus Line Items  
Risk [Text Block] 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 .
FidelityHealthSavingsFund-KPRO | Fidelity Health Savings Fund | IncomeRiskMember  
Prospectus Line Items  
Risk [Text Block] Income Risk. A low or negative interest rate environment can adversely affect an underlying fund's yield.
FidelityHealthSavingsFund-KPRO | Fidelity Health Savings Fund | GeographicExposureToThePacificBasinMember  
Prospectus Line Items  
Risk [Text Block] Geographic Exposure to the Pacific Basin. Because an underlying fund invests a meaningful portion of its assets in the Pacific Basin, the underlying fund's performance is expected to be closely tied to social, political, and economic conditions within the Pacific Basin and to be more volatile than the performance of more geographically diversified funds.
FidelityHealthSavingsFund-KPRO | Fidelity Health Savings Fund | AssetAllocationRiskMember  
Prospectus Line Items  
Risk [Text Block] Asset Allocation Risk. The fund is subject to risks resulting from the Adviser's asset allocation decisions. The selection of underlying funds and the allocation of the fund's assets among various asset classes could cause the fund to lose value or its results to lag relevant benchmarks or other funds with similar objectives.
FidelityHealthSavingsFund-KPRO | Fidelity Health Savings Fund | CorrelationToIndexMember  
Prospectus Line Items  
Risk [Text Block] Correlation to Index. The performance of an underlying index fund and its index may vary somewhat due to factors such as fees and expenses of the underlying fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on an underlying fund and its shareholders.
FidelityHealthSavingsFund-KPRO | Fidelity Health Savings Fund | InterestRateChangesMember  
Prospectus Line Items  
Risk [Text Block] Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.
FidelityHealthSavingsFund-KPRO | Fidelity Health Savings Fund | ForeignCurrencyTransactionsMember  
Prospectus Line Items  
Risk [Text Block] Foreign Currency Transactions. Although a forward foreign currency exchange contract is used to reduce or hedge a fund's exposure to changes in the value of the currency, suitable hedging transactions may not be available in all circumstances, may not be successful, and may eliminate any chance for the fund to benefit from favorable fluctuations in relevant foreign currencies.
FidelityHealthSavingsFund-KPRO | Fidelity Health Savings Fund | CommodityLinkedInvestingMember  
Prospectus Line Items  
Risk [Text Block] Commodity-Linked Investing. The value of commodities and commodity-linked investments may be affected by the performance of the overall commodities markets as well as weather, political, tax, and other regulatory and market developments. Commodity-linked investments may be more volatile and less liquid than the underlying commodity, instruments, or measures.
FidelityHealthSavingsFund-KPRO | Fidelity Health Savings Fund | PrepaymentMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityHealthSavingsFund-KPRO | Fidelity Health Savings Fund | GeographicExposureToEuropeMember  
Prospectus Line Items  
Risk [Text Block] Geographic Exposure to Europe. Because an underlying fund invests a meaningful portion of its assets in Europe, the underlying fund's performance is expected to be closely tied to social, political, and economic conditions within Europe and to be more volatile than the performance of more geographically diversified funds.
FidelityHealthSavingsFund-KPRO | Fidelity Health Savings Fund | InflationProtectedDebtExposureMember  
Prospectus Line Items  
Risk [Text Block] Inflation-Protected Debt Exposure. Increases in real interest rates can cause the price of inflation-protected debt securities to decrease. Interest payments on inflation-protected debt securities can be unpredictable.
FidelityHealthSavingsFund-KPRO | Fidelity Health Savings Fund | LeverageRiskMember  
Prospectus Line Items  
Risk [Text Block] Leverage Risk. Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly.
FidelityHealthSavingsFund-KPRO | Fidelity Health Savings Fund | InvestingInOtherFundsMember  
Prospectus Line Items  
Risk [Text Block] Investing in Other Funds. The fund bears all risks of investment strategies employed by the underlying funds, including the risk that the underlying funds will not meet their investment objectives.
FidelityHealthSavingsFund-KPRO | Fidelity Health Savings Fund | IndustryExposureMember  
Prospectus Line Items  
Risk [Text Block] Industry Exposure. Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries.
FidelityHealthSavingsFund-KPRO | Fidelity Health Savings Fund | IssuerSpecificChangesMember  
Prospectus Line Items  
Risk [Text Block] 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. A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease. 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 and can be difficult to resell.
FidelityHealthSavingsFund-KPRO | Fidelity Health Savings Fund | StockMarketVolatilityMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityHealthSavingsFund-KPRO | Fidelity Health Savings Fund | CommodityFuturesMember  
Prospectus Line Items  
Risk [Text Block] Commodity Futures. Investments in commodity futures contracts are also subject to the risk of the failure of any of the exchanges on which an underlying fund's positions trade or of its clearinghouses or counterparties. In addition, certain commodity exchanges limit fluctuations in certain futures contract prices during a single day by regulations referred to as "daily price fluctuation limits" or "daily limits." Under such daily limits, during a single trading day no trades may be executed at prices beyond the daily limit. If triggered, these limits could prevent the underlying fund from liquidating unfavorable positions and subject the underlying fund to losses or prevent it from entering into desired trades during the particular trading day.
FidelityHealthSavingsFund-KPRO | Fidelity Health Savings Fund | InvestingInEtfsMember  
Prospectus Line Items  
Risk [Text Block] Investing in Exchange Traded Funds (ETFs). ETFs may trade in the secondary market at prices below the value of their underlying portfolios and may not be liquid. ETFs that track an index are subject to tracking error and may be unable to sell poorly performing assets that are included in their index or other benchmark.
FidelityHealthSavingsFund-KPRO | Fidelity Health Savings Fund | ForeignExposureMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityHealthSavingsFund-KPRO | Fidelity Health Savings Fund | PassiveManagementRiskMember  
Prospectus Line Items  
Risk [Text Block] Passive Management Risk. Some of the underlying funds in which the fund invests are managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of an underlying fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the performance of these underlying funds could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers. An underlying index fund may be concentrated to approximately the same extent that its index concentrates in the securities of issuers in a particular industry or group of industries.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 20% | Risk Lose Money [Member]  
Prospectus Line Items  
Risk [Text Block]   You could lose money by investing in the fund.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 20% | Risk Not Insured Depository Institution [Member]  
Prospectus Line Items  
Risk [Text Block] 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 .
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 20% | IncomeRiskMember  
Prospectus Line Items  
Risk [Text Block] Income Risk. A low or negative interest rate environment can adversely affect an underlying fund's yield.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 20% | InterestRateChangesMember  
Prospectus Line Items  
Risk [Text Block] Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 20% | PrepaymentMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 20% | IssuerSpecificChangesMember  
Prospectus Line Items  
Risk [Text Block] 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. A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease. 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.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 20% | StockMarketVolatilityMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 20% | InvestingInEtfsMember  
Prospectus Line Items  
Risk [Text Block] Investing in Exchange Traded Funds (ETFs). ETFs may trade in the secondary market at prices below the value of their underlying portfolios and may not be liquid. ETFs that track an index are subject to tracking error and may be unable to sell poorly performing assets that are included in their index or other benchmark.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 20% | ForeignExposureMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 30% | Risk Lose Money [Member]  
Prospectus Line Items  
Risk [Text Block]   You could lose money by investing in the fund.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 30% | Risk Not Insured Depository Institution [Member]  
Prospectus Line Items  
Risk [Text Block] 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 .
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 30% | IncomeRiskMember  
Prospectus Line Items  
Risk [Text Block] Income Risk. A low or negative interest rate environment can adversely affect an underlying fund's yield.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 30% | InterestRateChangesMember  
Prospectus Line Items  
Risk [Text Block] Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 30% | PrepaymentMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 30% | IssuerSpecificChangesMember  
Prospectus Line Items  
Risk [Text Block] 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. A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease. 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.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 30% | StockMarketVolatilityMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 30% | InvestingInEtfsMember  
Prospectus Line Items  
Risk [Text Block] Investing in Exchange Traded Funds (ETFs). ETFs may trade in the secondary market at prices below the value of their underlying portfolios and may not be liquid. ETFs that track an index are subject to tracking error and may be unable to sell poorly performing assets that are included in their index or other benchmark.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 30% | ForeignExposureMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 40% | Risk Lose Money [Member]  
Prospectus Line Items  
Risk [Text Block]   You could lose money by investing in the fund.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 40% | Risk Not Insured Depository Institution [Member]  
Prospectus Line Items  
Risk [Text Block] 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 .
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 40% | IncomeRiskMember  
Prospectus Line Items  
Risk [Text Block] Income Risk. A low or negative interest rate environment can adversely affect an underlying fund's yield.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 40% | GeographicExposureToThePacificBasinMember  
Prospectus Line Items  
Risk [Text Block] Geographic Exposure to the Pacific Basin. Because an underlying fund invests a meaningful portion of its assets in the Pacific Basin, the underlying fund's performance is expected to be closely tied to social, political, and economic conditions within the Pacific Basin and to be more volatile than the performance of more geographically diversified funds.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 40% | InterestRateChangesMember  
Prospectus Line Items  
Risk [Text Block] Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 40% | PrepaymentMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 40% | GeographicExposureToEuropeMember  
Prospectus Line Items  
Risk [Text Block] Geographic Exposure to Europe. Because an underlying fund invests a meaningful portion of its assets in Europe, the underlying fund's performance is expected to be closely tied to social, political, and economic conditions within Europe and to be more volatile than the performance of more geographically diversified funds.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 40% | IssuerSpecificChangesMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 40% | StockMarketVolatilityMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 40% | InvestingInEtfsMember  
Prospectus Line Items  
Risk [Text Block] Investing in Exchange Traded Funds (ETFs). ETFs may trade in the secondary market at prices below the value of their underlying portfolios and may not be liquid. ETFs that track an index are subject to tracking error and may be unable to sell poorly performing assets that are included in their index or other benchmark.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 40% | ForeignExposureMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 50% | Risk Lose Money [Member]  
Prospectus Line Items  
Risk [Text Block]   You could lose money by investing in the fund.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 50% | Risk Not Insured Depository Institution [Member]  
Prospectus Line Items  
Risk [Text Block] 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 .
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 50% | IncomeRiskMember  
Prospectus Line Items  
Risk [Text Block] Income Risk. A low or negative interest rate environment can adversely affect an underlying fund's yield.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 50% | GeographicExposureToThePacificBasinMember  
Prospectus Line Items  
Risk [Text Block] Geographic Exposure to the Pacific Basin. Because an underlying fund invests a meaningful portion of its assets in the Pacific Basin, the underlying fund's performance is expected to be closely tied to social, political, and economic conditions within the Pacific Basin and to be more volatile than the performance of more geographically diversified funds.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 50% | InterestRateChangesMember  
Prospectus Line Items  
Risk [Text Block] Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 50% | PrepaymentMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 50% | GeographicExposureToEuropeMember  
Prospectus Line Items  
Risk [Text Block] Geographic Exposure to Europe. Because an underlying fund invests a meaningful portion of its assets in Europe, the underlying fund's performance is expected to be closely tied to social, political, and economic conditions within Europe and to be more volatile than the performance of more geographically diversified funds.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 50% | IssuerSpecificChangesMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 50% | StockMarketVolatilityMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 50% | InvestingInEtfsMember  
Prospectus Line Items  
Risk [Text Block] Investing in Exchange Traded Funds (ETFs). ETFs may trade in the secondary market at prices below the value of their underlying portfolios and may not be liquid. ETFs that track an index are subject to tracking error and may be unable to sell poorly performing assets that are included in their index or other benchmark.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 50% | ForeignExposureMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 60% | Risk Lose Money [Member]  
Prospectus Line Items  
Risk [Text Block]   You could lose money by investing in the fund.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 60% | Risk Not Insured Depository Institution [Member]  
Prospectus Line Items  
Risk [Text Block] 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 .
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 60% | IncomeRiskMember  
Prospectus Line Items  
Risk [Text Block] Income Risk. A low or negative interest rate environment can adversely affect an underlying fund's yield.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 60% | GeographicExposureToThePacificBasinMember  
Prospectus Line Items  
Risk [Text Block] Geographic Exposure to the Pacific Basin. Because an underlying fund invests a meaningful portion of its assets in the Pacific Basin, the underlying fund's performance is expected to be closely tied to social, political, and economic conditions within the Pacific Basin and to be more volatile than the performance of more geographically diversified funds.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 60% | InterestRateChangesMember  
Prospectus Line Items  
Risk [Text Block] Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 60% | PrepaymentMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 60% | GeographicExposureToEuropeMember  
Prospectus Line Items  
Risk [Text Block] Geographic Exposure to Europe. Because an underlying fund invests a meaningful portion of its assets in Europe, the underlying fund's performance is expected to be closely tied to social, political, and economic conditions within Europe and to be more volatile than the performance of more geographically diversified funds.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 60% | IssuerSpecificChangesMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 60% | StockMarketVolatilityMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 60% | InvestingInEtfsMember  
Prospectus Line Items  
Risk [Text Block] Investing in Exchange Traded Funds (ETFs). ETFs may trade in the secondary market at prices below the value of their underlying portfolios and may not be liquid. ETFs that track an index are subject to tracking error and may be unable to sell poorly performing assets that are included in their index or other benchmark.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 60% | ForeignExposureMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 70% | Risk Lose Money [Member]  
Prospectus Line Items  
Risk [Text Block]   You could lose money by investing in the fund.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 70% | Risk Not Insured Depository Institution [Member]  
Prospectus Line Items  
Risk [Text Block] 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 .
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 70% | IncomeRiskMember  
Prospectus Line Items  
Risk [Text Block] Income Risk. A low or negative interest rate environment can adversely affect an underlying fund's yield.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 70% | GeographicExposureToThePacificBasinMember  
Prospectus Line Items  
Risk [Text Block] Geographic Exposure to the Pacific Basin. Because an underlying fund invests a meaningful portion of its assets in the Pacific Basin, the underlying fund's performance is expected to be closely tied to social, political, and economic conditions within the Pacific Basin and to be more volatile than the performance of more geographically diversified funds.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 70% | InterestRateChangesMember  
Prospectus Line Items  
Risk [Text Block] Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 70% | PrepaymentMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 70% | GeographicExposureToEuropeMember  
Prospectus Line Items  
Risk [Text Block] Geographic Exposure to Europe. Because an underlying fund invests a meaningful portion of its assets in Europe, the underlying fund's performance is expected to be closely tied to social, political, and economic conditions within Europe and to be more volatile than the performance of more geographically diversified funds.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 70% | IssuerSpecificChangesMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 70% | StockMarketVolatilityMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 70% | InvestingInEtfsMember  
Prospectus Line Items  
Risk [Text Block] Investing in Exchange Traded Funds (ETFs). ETFs may trade in the secondary market at prices below the value of their underlying portfolios and may not be liquid. ETFs that track an index are subject to tracking error and may be unable to sell poorly performing assets that are included in their index or other benchmark.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 70% | ForeignExposureMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 85% | Risk Lose Money [Member]  
Prospectus Line Items  
Risk [Text Block]   You could lose money by investing in the fund.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 85% | Risk Not Insured Depository Institution [Member]  
Prospectus Line Items  
Risk [Text Block] 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 .
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 85% | IncomeRiskMember  
Prospectus Line Items  
Risk [Text Block] Income Risk. A low or negative interest rate environment can adversely affect an underlying fund's yield.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 85% | GeographicExposureToThePacificBasinMember  
Prospectus Line Items  
Risk [Text Block] Geographic Exposure to the Pacific Basin. Because an underlying fund invests a meaningful portion of its assets in the Pacific Basin, the underlying fund's performance is expected to be closely tied to social, political, and economic conditions within the Pacific Basin and to be more volatile than the performance of more geographically diversified funds.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 85% | GeographicExposureToTheChinaRegionMember  
Prospectus Line Items  
Risk [Text Block] Geographic Exposure to the China Region. Because an underlying fund invests a meaningful portion of its assets in the China region, the underlying fund's performance is expected to be closely tied to social, political, and economic conditions within the China region and to be more volatile than the performance of more geographically diversified funds. In addition, because the underlying fund may invest a significant percentage of assets in certain industries, the underlying fund's performance could be affected to the extent that the particular industry or industries in which the underlying fund invests are sensitive to adverse social, political, economic, currency, or regulatory developments.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 85% | InterestRateChangesMember  
Prospectus Line Items  
Risk [Text Block] Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 85% | PrepaymentMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 85% | GeographicExposureToEuropeMember  
Prospectus Line Items  
Risk [Text Block] Geographic Exposure to Europe. Because an underlying fund invests a meaningful portion of its assets in Europe, the underlying fund's performance is expected to be closely tied to social, political, and economic conditions within Europe and to be more volatile than the performance of more geographically diversified funds.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 85% | GeographicExposureToAsiaMember  
Prospectus Line Items  
Risk [Text Block] Geographic Exposure to Asia. Because an underlying fund invests a meaningful portion of its assets in Asia, the underlying fund's performance is expected to be closely tied to social, political, and economic conditions within Asia and to be more volatile than the performance of more geographically diversified funds.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 85% | IssuerSpecificChangesMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 85% | StockMarketVolatilityMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 85% | InvestingInEtfsMember  
Prospectus Line Items  
Risk [Text Block] Investing in Exchange Traded Funds (ETFs). ETFs may trade in the secondary market at prices below the value of their underlying portfolios and may not be liquid. ETFs that track an index are subject to tracking error and may be unable to sell poorly performing assets that are included in their index or other benchmark.
FidelityAssetManagerFunds-AMCIZComboPRO | Fidelity Asset Manager 85% | ForeignExposureMember  
Prospectus Line Items  
Risk [Text Block] 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.
HSAFunds-ComboPRO | 30% Allocation Fund | Risk Lose Money [Member]  
Prospectus Line Items  
Risk [Text Block]   You could lose money by investing in the fund.
HSAFunds-ComboPRO | 30% Allocation Fund | Risk Not Insured Depository Institution [Member]  
Prospectus Line Items  
Risk [Text Block] 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 .
HSAFunds-ComboPRO | 30% Allocation Fund | CorrelationToIndexMember  
Prospectus Line Items  
Risk [Text Block] Correlation to Index. The performance of an underlying index fund and its index may vary somewhat due to factors such as fees and expenses of the underlying fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on an underlying fund and its shareholders.
HSAFunds-ComboPRO | 30% Allocation Fund | InterestRateChangesMember  
Prospectus Line Items  
Risk [Text Block] Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.
HSAFunds-ComboPRO | 30% Allocation Fund | PrepaymentMember  
Prospectus Line Items  
Risk [Text Block] 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.
HSAFunds-ComboPRO | 30% Allocation Fund | LeverageRiskMember  
Prospectus Line Items  
Risk [Text Block] Leverage Risk. Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly.
HSAFunds-ComboPRO | 30% Allocation Fund | InvestingInOtherFundsMember  
Prospectus Line Items  
Risk [Text Block] Investing in Other Funds. The fund bears all risks of investment strategies employed by the underlying funds, including the risk that the underlying funds will not meet their investment objectives.
HSAFunds-ComboPRO | 30% Allocation Fund | IssuerSpecificChangesMember  
Prospectus Line Items  
Risk [Text Block] 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. Changes in the financial condition of an issuer or counterparty (e.g., broker-dealer or other borrower in a securities lending transaction) can increase the risk of default by an issuer or counterparty, which can affect a security's or instrument's value or result in delays in recovering securities and/or capital from a counterparty. A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease.
HSAFunds-ComboPRO | 30% Allocation Fund | StockMarketVolatilityMember  
Prospectus Line Items  
Risk [Text Block] 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.
HSAFunds-ComboPRO | 30% Allocation Fund | SecuritiesLendingRiskMember  
Prospectus Line Items  
Risk [Text Block] Securities Lending Risk. Securities lending involves the risk that the borrower may fail to return the securities loaned in a timely manner or at all. If the borrower defaults on its obligation to return the securities loaned because of insolvency or other reasons, an underlying fund could experience delays and costs in recovering the securities loaned or in gaining access to the collateral.
HSAFunds-ComboPRO | 30% Allocation Fund | ForeignExposureMember  
Prospectus Line Items  
Risk [Text Block] Foreign Exposure. Foreign 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.
HSAFunds-ComboPRO | 30% Allocation Fund | PassiveManagementRiskMember  
Prospectus Line Items  
Risk [Text Block] Passive Management Risk. Some of the underlying funds in which the fund invests are managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of an underlying fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the performance of these underlying funds could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers. An underlying index fund may be concentrated to approximately the same extent that its index concentrates in the securities of issuers in a particular industry or group of industries.
HSAFunds-ComboPRO | 50% Allocation Fund | Risk Lose Money [Member]  
Prospectus Line Items  
Risk [Text Block]   You could lose money by investing in the fund.
HSAFunds-ComboPRO | 50% Allocation Fund | Risk Not Insured Depository Institution [Member]  
Prospectus Line Items  
Risk [Text Block] 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 .
HSAFunds-ComboPRO | 50% Allocation Fund | CorrelationToIndexMember  
Prospectus Line Items  
Risk [Text Block] Correlation to Index. The performance of an underlying index fund and its index may vary somewhat due to factors such as fees and expenses of the underlying fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on an underlying fund and its shareholders.
HSAFunds-ComboPRO | 50% Allocation Fund | InterestRateChangesMember  
Prospectus Line Items  
Risk [Text Block] Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.
HSAFunds-ComboPRO | 50% Allocation Fund | PrepaymentMember  
Prospectus Line Items  
Risk [Text Block] 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.
HSAFunds-ComboPRO | 50% Allocation Fund | MidCapInvestingMember  
Prospectus Line Items  
Risk [Text Block] Mid Cap Investing. The value of securities of medium size, less well-known issuers can perform differently from the market as a whole and other types of stocks and can be more volatile than that of larger issuers.
HSAFunds-ComboPRO | 50% Allocation Fund | GeographicExposureToEuropeMember  
Prospectus Line Items  
Risk [Text Block] Geographic Exposure to Europe. Because an underlying fund invests a meaningful portion of its assets in Europe, the underlying fund's performance is expected to be closely tied to social, political, and economic conditions within Europe and to be more volatile than the performance of more geographically diversified funds.
HSAFunds-ComboPRO | 50% Allocation Fund | GeographicExposureToAsiaMember  
Prospectus Line Items  
Risk [Text Block] Geographic Exposure to Asia. Because an underlying fund invests a meaningful portion of its assets in Asia, the underlying fund's performance is expected to be closely tied to social, political, and economic conditions within Asia and to be more volatile than the performance of more geographically diversified funds.
HSAFunds-ComboPRO | 50% Allocation Fund | ForeignAndEmergingMarketsRiskMember  
Prospectus Line Items  
Risk [Text Block] Foreign and Emerging Markets Risk. 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.
HSAFunds-ComboPRO | 50% Allocation Fund | LeverageRiskMember  
Prospectus Line Items  
Risk [Text Block] Leverage Risk. Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly.
HSAFunds-ComboPRO | 50% Allocation Fund | InvestingInOtherFundsMember  
Prospectus Line Items  
Risk [Text Block] Investing in Other Funds. The fund bears all risks of investment strategies employed by the underlying funds, including the risk that the underlying funds will not meet their investment objectives.
HSAFunds-ComboPRO | 50% Allocation Fund | IssuerSpecificChangesMember  
Prospectus Line Items  
Risk [Text Block] 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. Changes in the financial condition of an issuer or counterparty (e.g., broker-dealer or other borrower in a securities lending transaction) can increase the risk of default by an issuer or counterparty, which can affect a security's or instrument's value or result in delays in recovering securities and/or capital from a counterparty. A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease.
HSAFunds-ComboPRO | 50% Allocation Fund | StockMarketVolatilityMember  
Prospectus Line Items  
Risk [Text Block] 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.
HSAFunds-ComboPRO | 50% Allocation Fund | SmallCapInvestingMember  
Prospectus Line Items  
Risk [Text Block] Small Cap Investing. The value of securities of smaller, less well-known issuers can perform differently from the market as a whole and other types of stocks and can be more volatile than that of larger issuers.
HSAFunds-ComboPRO | 50% Allocation Fund | SecuritiesLendingRiskMember  
Prospectus Line Items  
Risk [Text Block] Securities Lending Risk. Securities lending involves the risk that the borrower may fail to return the securities loaned in a timely manner or at all. If the borrower defaults on its obligation to return the securities loaned because of insolvency or other reasons, an underlying fund could experience delays and costs in recovering the securities loaned or in gaining access to the collateral.
HSAFunds-ComboPRO | 50% Allocation Fund | PassiveManagementRiskMember  
Prospectus Line Items  
Risk [Text Block] Passive Management Risk. Some of the underlying funds in which the fund invests are managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of an underlying fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the performance of these underlying funds could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers. An underlying index fund may be concentrated to approximately the same extent that its index concentrates in the securities of issuers in a particular industry or group of industries.
HSAFunds-ComboPRO | 70% Allocation Fund | Risk Lose Money [Member]  
Prospectus Line Items  
Risk [Text Block]   You could lose money by investing in the fund.
HSAFunds-ComboPRO | 70% Allocation Fund | Risk Not Insured Depository Institution [Member]  
Prospectus Line Items  
Risk [Text Block] 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 .
HSAFunds-ComboPRO | 70% Allocation Fund | CorrelationToIndexMember  
Prospectus Line Items  
Risk [Text Block] Correlation to Index. The performance of an underlying index fund and its index may vary somewhat due to factors such as fees and expenses of the underlying fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on an underlying fund and its shareholders.
HSAFunds-ComboPRO | 70% Allocation Fund | InterestRateChangesMember  
Prospectus Line Items  
Risk [Text Block] Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.
HSAFunds-ComboPRO | 70% Allocation Fund | PrepaymentMember  
Prospectus Line Items  
Risk [Text Block] 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.
HSAFunds-ComboPRO | 70% Allocation Fund | MidCapInvestingMember  
Prospectus Line Items  
Risk [Text Block] Mid Cap Investing. The value of securities of medium size, less well-known issuers can perform differently from the market as a whole and other types of stocks and can be more volatile than that of larger issuers.
HSAFunds-ComboPRO | 70% Allocation Fund | GeographicExposureToEuropeMember  
Prospectus Line Items  
Risk [Text Block] Geographic Exposure to Europe. Because an underlying fund invests a meaningful portion of its assets in Europe, the underlying fund's performance is expected to be closely tied to social, political, and economic conditions within Europe and to be more volatile than the performance of more geographically diversified funds.
HSAFunds-ComboPRO | 70% Allocation Fund | GeographicExposureToAsiaMember  
Prospectus Line Items  
Risk [Text Block] Geographic Exposure to Asia. Because an underlying fund invests a meaningful portion of its assets in Asia, the underlying fund's performance is expected to be closely tied to social, political, and economic conditions within Asia and to be more volatile than the performance of more geographically diversified funds.
HSAFunds-ComboPRO | 70% Allocation Fund | ForeignAndEmergingMarketsRiskMember  
Prospectus Line Items  
Risk [Text Block] Foreign and Emerging Markets Risk. 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.
HSAFunds-ComboPRO | 70% Allocation Fund | LeverageRiskMember  
Prospectus Line Items  
Risk [Text Block] Leverage Risk. Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly.
HSAFunds-ComboPRO | 70% Allocation Fund | InvestingInOtherFundsMember  
Prospectus Line Items  
Risk [Text Block] Investing in Other Funds. The fund bears all risks of investment strategies employed by the underlying funds, including the risk that the underlying funds will not meet their investment objectives.
HSAFunds-ComboPRO | 70% Allocation Fund | IssuerSpecificChangesMember  
Prospectus Line Items  
Risk [Text Block] 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. Changes in the financial condition of an issuer or counterparty (e.g., broker-dealer or other borrower in a securities lending transaction) can increase the risk of default by an issuer or counterparty, which can affect a security's or instrument's value or result in delays in recovering securities and/or capital from a counterparty. A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease.
HSAFunds-ComboPRO | 70% Allocation Fund | StockMarketVolatilityMember  
Prospectus Line Items  
Risk [Text Block] 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.
HSAFunds-ComboPRO | 70% Allocation Fund | SmallCapInvestingMember  
Prospectus Line Items  
Risk [Text Block] Small Cap Investing. The value of securities of smaller, less well-known issuers can perform differently from the market as a whole and other types of stocks and can be more volatile than that of larger issuers.
HSAFunds-ComboPRO | 70% Allocation Fund | SecuritiesLendingRiskMember  
Prospectus Line Items  
Risk [Text Block] Securities Lending Risk. Securities lending involves the risk that the borrower may fail to return the securities loaned in a timely manner or at all. If the borrower defaults on its obligation to return the securities loaned because of insolvency or other reasons, an underlying fund could experience delays and costs in recovering the securities loaned or in gaining access to the collateral.
HSAFunds-ComboPRO | 70% Allocation Fund | PassiveManagementRiskMember  
Prospectus Line Items  
Risk [Text Block] Passive Management Risk. Some of the underlying funds in which the fund invests are managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of an underlying fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the performance of these underlying funds could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers. An underlying index fund may be concentrated to approximately the same extent that its index concentrates in the securities of issuers in a particular industry or group of industries.
HSAFunds-ComboPRO | 85% Allocation Fund | Risk Lose Money [Member]  
Prospectus Line Items  
Risk [Text Block]   You could lose money by investing in the fund.
HSAFunds-ComboPRO | 85% Allocation Fund | Risk Not Insured Depository Institution [Member]  
Prospectus Line Items  
Risk [Text Block] 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 .
HSAFunds-ComboPRO | 85% Allocation Fund | CorrelationToIndexMember  
Prospectus Line Items  
Risk [Text Block] Correlation to Index. The performance of an underlying index fund and its index may vary somewhat due to factors such as fees and expenses of the underlying fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on an underlying fund and its shareholders.
HSAFunds-ComboPRO | 85% Allocation Fund | InterestRateChangesMember  
Prospectus Line Items  
Risk [Text Block] Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.
HSAFunds-ComboPRO | 85% Allocation Fund | PrepaymentMember  
Prospectus Line Items  
Risk [Text Block] 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.
HSAFunds-ComboPRO | 85% Allocation Fund | MidCapInvestingMember  
Prospectus Line Items  
Risk [Text Block] Mid Cap Investing. The value of securities of medium size, less well-known issuers can perform differently from the market as a whole and other types of stocks and can be more volatile than that of larger issuers.
HSAFunds-ComboPRO | 85% Allocation Fund | GeographicExposureToEuropeMember  
Prospectus Line Items  
Risk [Text Block] Geographic Exposure to Europe. Because an underlying fund invests a meaningful portion of its assets in Europe, the underlying fund's performance is expected to be closely tied to social, political, and economic conditions within Europe and to be more volatile than the performance of more geographically diversified funds.
HSAFunds-ComboPRO | 85% Allocation Fund | GeographicExposureToAsiaMember  
Prospectus Line Items  
Risk [Text Block] Geographic Exposure to Asia. Because an underlying fund invests a meaningful portion of its assets in Asia, the underlying fund's performance is expected to be closely tied to social, political, and economic conditions within Asia and to be more volatile than the performance of more geographically diversified funds.
HSAFunds-ComboPRO | 85% Allocation Fund | ForeignAndEmergingMarketsRiskMember  
Prospectus Line Items  
Risk [Text Block] Foreign and Emerging Markets Risk. 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.
HSAFunds-ComboPRO | 85% Allocation Fund | LeverageRiskMember  
Prospectus Line Items  
Risk [Text Block] Leverage Risk. Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly.
HSAFunds-ComboPRO | 85% Allocation Fund | InvestingInOtherFundsMember  
Prospectus Line Items  
Risk [Text Block] Investing in Other Funds. The fund bears all risks of investment strategies employed by the underlying funds, including the risk that the underlying funds will not meet their investment objectives.
HSAFunds-ComboPRO | 85% Allocation Fund | IssuerSpecificChangesMember  
Prospectus Line Items  
Risk [Text Block] 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. Changes in the financial condition of an issuer or counterparty (e.g., broker-dealer or other borrower in a securities lending transaction) can increase the risk of default by an issuer or counterparty, which can affect a security's or instrument's value or result in delays in recovering securities and/or capital from a counterparty. A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease.
HSAFunds-ComboPRO | 85% Allocation Fund | StockMarketVolatilityMember  
Prospectus Line Items  
Risk [Text Block] 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.
HSAFunds-ComboPRO | 85% Allocation Fund | SmallCapInvestingMember  
Prospectus Line Items  
Risk [Text Block] Small Cap Investing. The value of securities of smaller, less well-known issuers can perform differently from the market as a whole and other types of stocks and can be more volatile than that of larger issuers.
HSAFunds-ComboPRO | 85% Allocation Fund | SecuritiesLendingRiskMember  
Prospectus Line Items  
Risk [Text Block] Securities Lending Risk. Securities lending involves the risk that the borrower may fail to return the securities loaned in a timely manner or at all. If the borrower defaults on its obligation to return the securities loaned because of insolvency or other reasons, an underlying fund could experience delays and costs in recovering the securities loaned or in gaining access to the collateral.
HSAFunds-ComboPRO | 85% Allocation Fund | PassiveManagementRiskMember  
Prospectus Line Items  
Risk [Text Block] Passive Management Risk. Some of the underlying funds in which the fund invests are managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of an underlying fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the performance of these underlying funds could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers. An underlying index fund may be concentrated to approximately the same extent that its index concentrates in the securities of issuers in a particular industry or group of industries.
FidelitySustainableMulti-AssetFund-AMCIPRO | Fidelity Sustainable Multi-Asset Fund | Risk Lose Money [Member]  
Prospectus Line Items  
Risk [Text Block]   You could lose money by investing in the fund.
FidelitySustainableMulti-AssetFund-AMCIPRO | Fidelity Sustainable Multi-Asset Fund | Risk Not Insured Depository Institution [Member]  
Prospectus Line Items  
Risk [Text Block] 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 .
FidelitySustainableMulti-AssetFund-AMCIPRO | Fidelity Sustainable Multi-Asset Fund | AssetAllocationRiskMember  
Prospectus Line Items  
Risk [Text Block] Asset Allocation Risk. The fund is subject to risks resulting from the Adviser's asset allocation decisions. The selection of underlying funds and the allocation of the fund's assets among various asset classes could cause the fund to lose value or its results to lag relevant benchmarks or other funds with similar objectives.
FidelitySustainableMulti-AssetFund-AMCIPRO | Fidelity Sustainable Multi-Asset Fund | CorrelationToIndexMember  
Prospectus Line Items  
Risk [Text Block] Correlation to Index. The performance of an underlying index fund and its index may vary somewhat due to factors such as fees and expenses of the underlying fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on an underlying fund and its shareholders.
FidelitySustainableMulti-AssetFund-AMCIPRO | Fidelity Sustainable Multi-Asset Fund | InterestRateChangesMember  
Prospectus Line Items  
Risk [Text Block] Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.
FidelitySustainableMulti-AssetFund-AMCIPRO | Fidelity Sustainable Multi-Asset Fund | PrepaymentMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelitySustainableMulti-AssetFund-AMCIPRO | Fidelity Sustainable Multi-Asset Fund | SustainabilityRiskMember  
Prospectus Line Items  
Risk [Text Block] Sustainability Risk. Application of Fidelity Management & Research Company LLC's (FMR) (the Adviser) ESG ratings process and/or its sustainable investing exclusion criteria may affect the fund's exposure to certain issuers, sectors, regions, and countries and may affect the fund's performance depending on whether certain investments are in or out of favor. The criteria related to the fund's ESG ratings process and/or adherence to its sustainable investing exclusion criteria may result in the fund forgoing opportunities to buy certain securities when it might otherwise be advantageous to do so, or selling securities for ESG reasons when it might be otherwise disadvantageous for it to do so. As a result, the fund's performance may at times be better or worse than the performance of funds that do not use ESG or sustainability criteria. There are significant differences in interpretations of what it means for an issuer to have positive ESG factors. While the Adviser believes its definitions are reasonable, the portfolio decisions it makes may differ with other investors' or advisers' views. When evaluating an issuer, the Adviser is dependent on information or data obtained through voluntary or third-party reporting that may be incomplete, inaccurate, or unavailable, which could cause the Adviser to incorrectly assess an issuer's business practices.
FidelitySustainableMulti-AssetFund-AMCIPRO | Fidelity Sustainable Multi-Asset Fund | GeographicExposureToEuropeMember  
Prospectus Line Items  
Risk [Text Block] Geographic Exposure to Europe. Because an underlying fund invests a meaningful portion of its assets in Europe, the underlying fund's performance is expected to be closely tied to social, political, and economic conditions within Europe and to be more volatile than the performance of more geographically diversified funds.
FidelitySustainableMulti-AssetFund-AMCIPRO | Fidelity Sustainable Multi-Asset Fund | GeographicExposureToAsiaMember  
Prospectus Line Items  
Risk [Text Block] Geographic Exposure to Asia. Because an underlying fund invests a meaningful portion of its assets in Asia, the underlying fund's performance is expected to be closely tied to social, political, and economic conditions within Asia and to be more volatile than the performance of more geographically diversified funds.
FidelitySustainableMulti-AssetFund-AMCIPRO | Fidelity Sustainable Multi-Asset Fund | ForeignAndEmergingMarketsRiskMember  
Prospectus Line Items  
Risk [Text Block] Foreign and Emerging Markets Risk. 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.
FidelitySustainableMulti-AssetFund-AMCIPRO | Fidelity Sustainable Multi-Asset Fund | LeverageRiskMember  
Prospectus Line Items  
Risk [Text Block] Leverage Risk. Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly.
FidelitySustainableMulti-AssetFund-AMCIPRO | Fidelity Sustainable Multi-Asset Fund | InvestingInOtherFundsMember  
Prospectus Line Items  
Risk [Text Block] Investing in Other Funds. The fund bears all risks of investment strategies employed by the underlying funds, including the risk that the underlying funds will not meet their investment objectives.
FidelitySustainableMulti-AssetFund-AMCIPRO | Fidelity Sustainable Multi-Asset Fund | GeographicExposureToJapanMember  
Prospectus Line Items  
Risk [Text Block] Geographic Exposure to Japan. Because an underlying fund invests a meaningful portion of its assets in Japan, the underlying fund's performance is expected to be closely tied to social, political, and economic conditions within Japan and to be more volatile than the performance of more geographically diversified funds.
FidelitySustainableMulti-AssetFund-AMCIPRO | Fidelity Sustainable Multi-Asset Fund | IssuerSpecificChangesMember  
Prospectus Line Items  
Risk [Text Block] 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. Changes in the financial condition of an issuer or counterparty (e.g., broker-dealer or other borrower in a securities lending transaction) can increase the risk of default by an issuer or counterparty, which can affect a security's or instrument's value or result in delays in recovering securities and/or capital from a counterparty. A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease.
FidelitySustainableMulti-AssetFund-AMCIPRO | Fidelity Sustainable Multi-Asset Fund | StockMarketVolatilityMember  
Prospectus Line Items  
Risk [Text Block] 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.
FidelitySustainableMulti-AssetFund-AMCIPRO | Fidelity Sustainable Multi-Asset Fund | InvestingInEtfsMember  
Prospectus Line Items  
Risk [Text Block] Investing in ETFs. ETFs may trade in the secondary market at prices below the value of their underlying portfolios and may not be liquid. ETFs that track an index are subject to tracking error and may be unable to sell poorly performing assets that are included in their index or other benchmark.
FidelitySustainableMulti-AssetFund-AMCIPRO | Fidelity Sustainable Multi-Asset Fund | PassiveManagementRiskMember  
Prospectus Line Items  
Risk [Text Block] Passive Management Risk. Some of the underlying funds in which the fund invests are managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of an underlying fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the performance of these underlying funds could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers. An underlying index fund may be concentrated to approximately the same extent that its index concentrates in the securities of issuers in a particular industry or group of industries.
Document Type 485BPOS