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Risk Return Abstract rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName JOHN HANCOCK SOVEREIGN BOND FUND
Prospectus Date rr_ProspectusDate Oct. 01, 2023
John Hancock Bond Fund Classes A C I R2 R4 and R6 | John Hancock Bond Fund  
Risk Return Abstract rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading <span style="color:#000000;font-family:Arial;font-size:30pt;">John Hancock Bond Fund</span>
Objective [Heading] rr_ObjectiveHeading <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Investment objective</span>
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock To seek a high level of current income consistent with prudent investment risk.
Expense [Heading] rr_ExpenseHeading <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Fees and expenses</span>
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock This table describes the fees and expenses you may pay if you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts on Class A shares if you and your family invest, or agree to invest in the future, at least $100,000 in the John Hancock family of funds.Intermediaries may have different policies and procedures regarding the availability of front-end sales charge waivers or contingent deferred sales charge (CDSC) waivers (See Appendix 1 - Intermediary sales charge waivers, which includes information about specific sales charge waivers applicable to the intermediaries identified therein). More information about these and other discounts is available from your financial professional and beginning on page 24 of the prospectus under “Sales charge reductions and waivers” or page 111 of the fund’s Statement of Additional Information under “Sales Charges on Class A and Class C Shares.”
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption <span style="font-family:Arial;font-size:8pt;font-weight:bold;margin-left:0.0pt;">Shareholder fees (%) </span><span style="font-family:Arial;font-size:8pt;margin-left:0.0pt;">(fees paid directly from your investment)</span>
Operating Expenses Caption [Text] rr_OperatingExpensesCaption <span style="font-family:Arial;font-size:8pt;font-weight:bold;margin-left:0.0pt;">Annual fund operating expenses (%) </span><span style="font-family:Arial;font-size:8pt;margin-left:0.0pt;">(expenses that you pay each year as a percentage of </span><span style="font-family:Arial;font-size:8pt;margin-left:0.0pt;">the value of your investment)</span>
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination <span style="font-family:Arial;font-size:8pt;">July 31, </span><span style="font-family:Arial;font-size:8pt;">2025</span><span style="font-family:Arial;font-size:8pt;">September 30, </span><span style="font-family:Arial;font-size:8pt;">2024</span>
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Portfolio turnover</span>
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the fund’s performance. During its most recent fiscal year, the fund’s portfolio turnover rate was 108% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 108.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts <span style="font-family:Arial;font-size:9pt;">You may qualify for sales </span><span style="font-family:Arial;font-size:9pt;">charge discounts on Class A shares if you and your family invest, or agree to invest in the future, at least $</span><span style="font-family:Arial;font-size:9pt;">100,000</span><span style="font-family:Arial;font-size:9pt;"> in the John Hancock family of funds.</span>
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 100,000
Expense Example [Heading] rr_ExpenseExampleHeading <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Expense example</span>
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds. Please see below a hypothetical example showing the expenses of a $10,000 investment for the time periods indicated and then, except as shown below, assuming you sell all of your shares at the end of those periods. The example assumes a 5% average annual return and that fund expenses will not change over the periods. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption <span style="font-family:Arial;font-size:8pt;font-weight:bold;">Shares Sold</span>
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption <span style="font-family:Arial;font-size:8pt;font-weight:bold;">Shares</span><span style="font-family:Arial;font-size:8pt;font-weight:bold;">Not Sold</span>
Strategy [Heading] rr_StrategyHeading <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Principal investment strategies</span>
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock Under normal market conditions, the fund invests at least 80% of its net assets (plus any borrowings for investment purposes) in a diversified portfolio of bonds. These may include, but are not limited to, corporate bonds and debentures, mortgage-backed and asset-backed securities, and U.S. government and agency securities. Most of these securities are investment-grade, although the fund may invest up to 25% of its net assets in below-investment-grade debt securities (junk bonds) rated as low as CC by S&P Global Ratings (S&P) and Fitch Ratings, Inc. (Fitch Ratings) and Ca by Moody’s Investors Service, Inc. (Moody’s), or comparable rating by any nationally recognized statistical rating organization (NRSRO), or their unrated equivalents. The fund contemplates that at least 75% of its net assets will be in investment-grade debt securities and cash and cash equivalents. The fund’s investment policies are based on credit ratings at the time of purchase. There is no limit on average maturity.The manager focuses on sector allocation, industry allocation, and security selection in making investment decisions. When making sector and industry allocations, the manager uses top-down analysis to try to anticipate shifts in the business cycle. The manager uses bottom-up research to find individual securities that appear comparatively undervalued. The fund may invest in securities of foreign governments and corporations. The fund will not invest more than 10% of its total assets in securities denominated in foreign currencies. Under normal market conditions, the fund does not anticipate investing more than 25% of its total assets in U.S. dollar-denominated foreign securities (excluding U.S. dollar denominated Canadian securities).The manager considers environmental, social, and/or governance (ESG) factors, alongside other relevant factors, as part of its investment process. ESG factors may include, but are not limited to, matters regarding board diversity, climate change policies, and supply chain and human rights policies. The ESG characteristics utilized in the fund’s investment process may change over time and one or more characteristics may not be relevant with respect to all issuers that are eligible fund investments.The fund intends to keep its interest-rate exposure generally in line with its peers. The fund may engage in derivative transactions. Derivatives may be used to reduce risk, obtain efficient market exposure, and/or enhance investment returns, and may include futures contracts on securities and indexes; options on futures contracts, securities, and indexes; interest-rate, foreign currency, and credit default swaps; and foreign currency forward contracts. The fund’s investments in U.S. government and agency securities may or may not be supported by the full faith and credit of the United States.Under normal circumstances, the fund may not invest more than 10% of its net assets in cash or cash equivalents. The fund may trade securities actively.
Risk [Heading] rr_RiskHeading <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Principal risks</span>
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Past performance</span>
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The following information illustrates the variability of the fund’s returns and provides some indication of the risks of investing in the fund by showing changes in the fund’s performance from year to year and by showing how the fund’s average annual returns compared with a broad-based market index.Past performance (before and after taxes) does not indicate future results. All figures assume dividend reinvestment. Performance information is updated daily, monthly, and quarterly and may be obtained at our website, jhinvestments.com, or by calling 800-225-5291 (Class A and Class C), Monday to Thursday, 8:00 a.m.—7:00 p.m., and Friday, 8:00 a.m.—6:00 p.m., Eastern time, or 888-972-8696 (Class I, Class R2, Class R4, and Class R6) between 8:30 a.m. and 5:00 p.m., Eastern time, on most business days.A note on performanceClass A and Class R4 shares commenced operations on November 9, 1973 and March 27, 2015, respectively. Returns shown prior to a class’s commencement date are those of Class A shares, except that they do not include sales charges and would be lower if they did. Returns for Class R4 shares would have been substantially similar to returns of Class A shares because each share class is invested in the same portfolio of securities and returns would differ only to the extent that expenses of the classes are different. To the extent expenses of a class would have been higher than expenses of Class A shares for the periods shown, performance would have been lower.Please note that after-tax returns (shown for Class A shares only) reflect the highest individual federal marginal income-tax rate in effect as of the date provided and do not reflect any state or local taxes.Your actual after-tax returns may be different. After-tax returns are not relevant to shares held in an IRA, 401(k), or other tax-advantaged investment plan. After-tax returns for other share classes would vary. The returns for Class A shares have been adjusted to reflect the reduction in the maximum sales charge from 4.50% to 4.00%, effective February 3, 2014.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns <span style="color:#000000;font-family:Arial;font-size:9pt;">The following information illustrates the variability of the fund’s returns and provides some indication of the risks of investing in the fund by showing changes in the fund’s performance from year to year and by showing how the fund’s average annual returns compared with a broad-based market index.</span>
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone <span style="color:#000000;font-family:Arial;font-size:9pt;">800-225-5291 (Class A and Class C), </span><span style="color:#000000;font-family:Arial;font-size:9pt;">Monday to Thursday, 8:00</span><span style="color:#000000;font-family:Arial;font-size:9pt;line-height:12pt;"> </span><span style="color:#000000;font-family:Arial;font-size:9pt;font-variant:small-caps;">a.m.</span><span style="color:#000000;font-family:Arial;font-size:9pt;">—7:00</span><span style="color:#000000;font-family:Arial;font-size:9pt;line-height:12pt;"> </span><span style="color:#000000;font-family:Arial;font-size:9pt;font-variant:small-caps;">p.m.</span><span style="color:#000000;font-family:Arial;font-size:9pt;">, and Friday, 8:00</span><span style="color:#000000;font-family:Arial;font-size:9pt;line-height:12pt;"> </span><span style="color:#000000;font-family:Arial;font-size:9pt;font-variant:small-caps;">a.m.</span><span style="color:#000000;font-family:Arial;font-size:9pt;">—6:00</span><span style="color:#000000;font-family:Arial;font-size:9pt;line-height:12pt;"> </span><span style="color:#000000;font-family:Arial;font-size:9pt;font-variant:small-caps;">p.m.</span><span style="color:#000000;font-family:Arial;font-size:9pt;">, Eastern time, or 888-972-8696 (Class I, Class R2, Class R4, and Class R6) between 8:30</span><span style="color:#000000;font-family:Arial;font-size:9pt;line-height:12pt;"> </span><span style="color:#000000;font-family:Arial;font-size:9pt;font-variant:small-caps;">a.m.</span><span style="color:#000000;font-family:Arial;font-size:9pt;"> and 5:00</span><span style="color:#000000;font-family:Arial;font-size:9pt;line-height:12pt;"> </span><span style="color:#000000;font-family:Arial;font-size:9pt;font-variant:small-caps;">p.m.</span><span style="color:#000000;font-family:Arial;font-size:9pt;">, Eastern time, on most business days.</span>
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress <span style="color:#000000;font-family:Arial;font-size:9pt;">jhinvestments.com</span>
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture <span style="color:#000000;font-family:Arial;font-size:9pt;">Past performance (before and after taxes) does not indicate future results.</span>
Bar Chart [Heading] rr_BarChartHeading <span style="font-family:Arial;font-size:9pt;font-weight:bold;">Calendar year total returns (%)—Class A </span><span style="font-family:Arial;font-size:9pt;">(</span><span style="font-family:Arial;font-size:9pt;">sales charges are not reflected in the bar chart and returns would have been lower if they were</span><span style="font-family:Arial;font-size:9pt;">)</span>
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads <span style="font-family:Arial;font-size:9pt;">sales charges are not reflected in the bar chart and returns would have been lower if they were</span>
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock Year-to-date total return through:Q2 20232.63%Best quarter:Q2 20205.98%Worst quarter:Q2 2022-6.94%
Performance Table Heading rr_PerformanceTableHeading <span style="font-family:Arial;font-size:8pt;font-weight:bold;margin-left:0.0pt;">Average annual total returns (%)—as of 12/31/2022</span>
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate <span style="color:#000000;font-family:Arial;font-size:9pt;">Please note that after-tax returns (shown for Class A shares only)</span><span style="color:#000000;font-family:Arial;font-size:9pt;"> reflect the highest individual federal marginal income-tax rate in effect as of the date </span><span style="color:#000000;font-family:Arial;font-size:9pt;">provided and do not reflect any state or local taxes.</span>
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred <span style="color:#000000;font-family:Arial;font-size:9pt;">Your actual after-tax returns may be different. After-tax returns are not relevant to shares held in an </span><span style="color:#000000;font-family:Arial;font-size:9pt;">IRA, 401(k), or other tax-advantaged investment plan.</span>
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown <span style="color:#000000;font-family:Arial;font-size:9pt;">Please note that after-tax returns (shown for Class A shares only)</span>
John Hancock Bond Fund Classes A C I R2 R4 and R6 | John Hancock Bond Fund | Risk Lose Money [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Many factors affect performance, and fund shares will fluctuate in price, meaning you could lose money.
John Hancock Bond Fund Classes A C I R2 R4 and R6 | John Hancock Bond Fund | Risk Not Insured Depository Institution [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock An investment in the fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
John Hancock Bond Fund Classes A C I R2 R4 and R6 | John Hancock Bond Fund | Changing Distribution Levels Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Changing distribution levels risk.  The fund may cease or reduce the level of its distribution if income or dividends paid from its investments declines.
John Hancock Bond Fund Classes A C I R2 R4 and R6 | John Hancock Bond Fund | Credit And Counterparty Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Credit and counterparty risk.  The issuer or guarantor of a fixed-income security, the counterparty to an over-the-counter derivatives contract, or a borrower of fund securities may not make timely payments or otherwise honor its obligations. U.S. government securities are subject to varying degrees of credit risk depending upon the nature of their support. A downgrade or default affecting any of the fund’s securities could affect the fund’s performance.
John Hancock Bond Fund Classes A C I R2 R4 and R6 | John Hancock Bond Fund | Economic And Market Events Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Economic and market events risk.  Events in the U.S. and global financial markets, including actions taken by the U.S. Federal Reserve or foreign central banks to stimulate or stabilize economic growth, may at times result in unusually high market volatility, which could negatively impact performance. Reduced liquidity in credit and fixed-income markets could adversely affect issuers worldwide. Banks and financial services companies could suffer losses if interest rates rise or economic conditions deteriorate.
John Hancock Bond Fund Classes A C I R2 R4 and R6 | John Hancock Bond Fund | ESG Integration Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock ESG integration risk.  The manager considers ESG factors that it deems relevant or additive, along with other material factors and analysis, when managing the fund. ESG factors may include, but are not limited to, matters regarding board diversity, climate change policies, and supply chain and human rights policies. The manager may consider these ESG factors on all or a meaningful portion of the fund’s investments. Incorporating ESG criteria and making investment decisions based on certain ESG characteristics, as determined by the manager, carries the risk that the fund may perform differently, including underperforming, funds that do not utilize ESG criteria, or funds that utilize different ESG criteria.
John Hancock Bond Fund Classes A C I R2 R4 and R6 | John Hancock Bond Fund | Fixed Income Securities Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Fixed-income securities risk.  A rise in interest rates typically causes bond prices to fall. The longer the average maturity or duration of the bonds held by a fund, the more sensitive it will likely be to interest-rate fluctuations. An issuer may not make all interest payments or repay all or any of the principal borrowed. Changes in a security’s credit quality may adversely affect fund performance.
John Hancock Bond Fund Classes A C I R2 R4 and R6 | John Hancock Bond Fund | Foreign Securities Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Foreign securities risk.  Less information may be publicly available regarding foreign issuers, including foreign government issuers. Foreign securities may be subject to foreign taxes and may be more volatile than U.S. securities. Currency fluctuations and political and economic developments may adversely impact the value of foreign securities. If applicable, depositary receipts are subject to most of the risks associated with investing in foreign securities directly because the value of a depositary receipt is dependent upon the market price of the underlying foreign equity security. Depositary receipts are also subject to liquidity risk.
John Hancock Bond Fund Classes A C I R2 R4 and R6 | John Hancock Bond Fund | Hedging Derivatives And Other Strategic Transactions Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Hedging, derivatives, and other strategic transactions risk.  Hedging, derivatives, and other strategic transactions may increase a fund’s volatility and could produce disproportionate losses, potentially more than the fund’s principal investment. Risks of these transactions are different from and possibly greater than risks of investing directly in securities and other traditional instruments. Under certain market conditions, derivatives could become harder to value or sell and may become subject to liquidity risk (i.e., the inability to enter into closing transactions). Derivatives and other strategic transactions that the fund intends to utilize include: credit default swaps; foreign currency forward contracts; foreign currency swaps; futures contracts; interest-rate swaps; options on futures; and options. Foreign currency forward contracts, futures contracts, options, and swaps generally are subject to counterparty risk. In addition, swaps may be subject to interest-rate and settlement risk, and the risk of default of the underlying reference obligation. Derivatives associated with foreign currency transactions are subject to currency risk.
John Hancock Bond Fund Classes A C I R2 R4 and R6 | John Hancock Bond Fund | High Portfolio Turnover Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock High portfolio turnover risk.  Trading securities actively and frequently can increase transaction costs (thus lowering performance) and taxable distributions.
John Hancock Bond Fund Classes A C I R2 R4 and R6 | John Hancock Bond Fund | Liquidity Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Liquidity risk.  The extent (if at all) to which a security may be sold or a derivative position closed without negatively impacting its market value may be impaired by reduced market activity or participation, legal restrictions, or other economic and market impediments. Liquidity risk may be magnified in rising interest rate environments due to higher than normal redemption rates. Widespread selling of fixed-income securities to satisfy redemptions during periods of reduced demand may adversely impact the price or salability of such securities. Periods of heavy redemption could cause the fund to sell assets at a loss or depressed value, which could negatively affect performance. Redemption risk is heightened during periods of declining or illiquid markets.
John Hancock Bond Fund Classes A C I R2 R4 and R6 | John Hancock Bond Fund | Lower Rated And High Yield Fixed Income Securities Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Lower-rated and high-yield fixed-income securities risk.  Lower-rated and high-yield fixed-income securities (junk bonds) are subject to greater credit quality risk, risk of default, and price volatility than higher-rated fixed-income securities, may be considered speculative, and can be difficult to resell.
John Hancock Bond Fund Classes A C I R2 R4 and R6 | John Hancock Bond Fund | Mortgage Backed And Asset Backed Securities Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Mortgage-backed and asset-backed securities risk.  Mortgage-backed and asset-backed securities are subject to different combinations of prepayment, extension, interest-rate, and other market risks. Factors that impact the value of these securities include interest rate changes, the reliability of available information, credit quality or enhancement, and market perception.
John Hancock Bond Fund Classes A C I R2 R4 and R6 | John Hancock Bond Fund | Operational And Cybersecurity Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Operational and cybersecurity risk.  Cybersecurity breaches may allow an unauthorized party to gain access to fund assets, customer data, or proprietary information, or cause a fund or its service providers to suffer data corruption or lose operational functionality. Similar incidents affecting issuers of a fund’s securities may negatively impact performance. Operational risk may arise from human error, error by third parties, communication errors, or technology failures, among other causes.
John Hancock Bond Fund Classes A C I R2 R4 and R6 | John Hancock Bond Fund | Sector Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Sector risk.  When a fund focuses its investments in certain sectors of the economy, its performance may be driven largely by sector performance and could fluctuate more widely than if the fund were invested more evenly across sectors.
John Hancock Bond Fund Classes A C I R2 R4 and R6 | John Hancock Bond Fund | US Government Agency Obligations Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock U.S. government agency obligations risk.  The fund invests in obligations issued by agencies and instrumentalities of the U.S. government. Government-sponsored entities such as Federal National Mortgage Association (Fannie Mae), Federal Home Loan Mortgage Corporation (Freddie Mac) and the Federal Home Loan Banks, although chartered or sponsored by Congress, are not funded by congressional appropriations and the debt securities that they issue are neither guaranteed nor issued by the U.S. government. Such debt securities are subject to the risk of default on the payment of interest and/or principal, similar to the debt securities of private issuers. The maximum potential liability of the issuers of some U.S. government obligations may greatly exceed their current resources, including any legal right to support from the U.S. government. Although the U.S. government has provided financial support to Fannie Mae and Freddie Mac in the past, there can be no assurance that it will support these or other government-sponsored entities in the future.
John Hancock Bond Fund Classes A C I R2 R4 and R6 | John Hancock Bond Fund | Class A  
Risk Return Abstract rr_RiskReturnAbstract  
Maximum front-end sales charge (load) on purchases, as a % of purchase price rr_MaximumCumulativeSalesChargeOverOther 4.00%
Maximum deferred sales charge (load) as a % of purchase or sale price, whichever is less rr_MaximumDeferredSalesChargeOverOther 1.00%
Small account fee (for fund account balances under $1,000) ($) rr_ShareholderFeeOther $ 20
Management fee rr_ManagementFeesOverAssets 0.31%
Distribution and service (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.30%
Service plan fee rr_Component1OtherExpensesOverAssets none
Additional other expenses rr_Component2OtherExpensesOverAssets 0.17%
Total other expenses rr_OtherExpensesOverAssets 0.17%
Total annual fund operating expenses rr_ExpensesOverAssets 0.78%
Contractual expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.01%) [1]
Total annual fund operating expenses after expense reimbursements rr_NetExpensesOverAssets 0.77%
1 year rr_ExpenseExampleYear01 $ 475
3 years rr_ExpenseExampleYear03 638
5 years rr_ExpenseExampleYear05 815
10 years rr_ExpenseExampleYear10 $ 1,327
2013 rr_AnnualReturn2013 0.46%
2014 rr_AnnualReturn2014 6.39%
2015 rr_AnnualReturn2015 (0.18%)
2016 rr_AnnualReturn2016 4.46%
2017 rr_AnnualReturn2017 4.87%
2018 rr_AnnualReturn2018 (1.23%)
2019 rr_AnnualReturn2019 10.07%
2020 rr_AnnualReturn2020 8.81%
2021 rr_AnnualReturn2021 (0.48%)
2022 rr_AnnualReturn2022 (14.69%)
Year to Date Return, Label rr_YearToDateReturnLabel <span style="font-family:Arial;font-size:8pt;font-weight:bold;margin-left:0.0pt;">Year-to-date total return through:</span>
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2023
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 2.63%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel <span style="font-family:Arial;font-size:8pt;font-weight:bold;margin-left:0.0pt;">Best quarter:</span>
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 5.98%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel <span style="font-family:Arial;font-size:8pt;font-weight:bold;margin-left:0.0pt;">Worst quarter:</span>
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2022
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (6.94%)
1 year rr_AverageAnnualReturnYear01 (18.09%)
5 year rr_AverageAnnualReturnYear05 (0.73%)
10 year rr_AverageAnnualReturnYear10 1.20%
John Hancock Bond Fund Classes A C I R2 R4 and R6 | John Hancock Bond Fund | Class C  
Risk Return Abstract rr_RiskReturnAbstract  
Maximum front-end sales charge (load) on purchases, as a % of purchase price rr_MaximumCumulativeSalesChargeOverOther none
Maximum deferred sales charge (load) as a % of purchase or sale price, whichever is less rr_MaximumDeferredSalesChargeOverOther 1.00%
Small account fee (for fund account balances under $1,000) ($) rr_ShareholderFeeOther $ 20
Management fee rr_ManagementFeesOverAssets 0.31%
Distribution and service (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Service plan fee rr_Component1OtherExpensesOverAssets none
Additional other expenses rr_Component2OtherExpensesOverAssets 0.17%
Total other expenses rr_OtherExpensesOverAssets 0.17%
Total annual fund operating expenses rr_ExpensesOverAssets 1.48%
Contractual expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.01%) [1]
Total annual fund operating expenses after expense reimbursements rr_NetExpensesOverAssets 1.47%
1 year rr_ExpenseExampleYear01 $ 250
3 years rr_ExpenseExampleYear03 467
5 years rr_ExpenseExampleYear05 807
10 years rr_ExpenseExampleYear10 1,768
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 150
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 467
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 807
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,768
1 year rr_AverageAnnualReturnYear01 (16.11%)
5 year rr_AverageAnnualReturnYear05 (0.61%)
10 year rr_AverageAnnualReturnYear10 0.91%
John Hancock Bond Fund Classes A C I R2 R4 and R6 | John Hancock Bond Fund | Class I  
Risk Return Abstract rr_RiskReturnAbstract  
Maximum front-end sales charge (load) on purchases, as a % of purchase price rr_MaximumCumulativeSalesChargeOverOther none
Maximum deferred sales charge (load) as a % of purchase or sale price, whichever is less rr_MaximumDeferredSalesChargeOverOther none
Small account fee (for fund account balances under $1,000) ($) rr_ShareholderFeeOther none
Management fee rr_ManagementFeesOverAssets 0.31%
Distribution and service (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Service plan fee rr_Component1OtherExpensesOverAssets none
Additional other expenses rr_Component2OtherExpensesOverAssets 0.17%
Total other expenses rr_OtherExpensesOverAssets 0.17%
Total annual fund operating expenses rr_ExpensesOverAssets 0.48%
Contractual expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.01%) [1]
Total annual fund operating expenses after expense reimbursements rr_NetExpensesOverAssets 0.47%
1 year rr_ExpenseExampleYear01 $ 48
3 years rr_ExpenseExampleYear03 153
5 years rr_ExpenseExampleYear05 268
10 years rr_ExpenseExampleYear10 $ 603
1 year rr_AverageAnnualReturnYear01 (14.43%)
5 year rr_AverageAnnualReturnYear05 0.38%
10 year rr_AverageAnnualReturnYear10 1.93%
John Hancock Bond Fund Classes A C I R2 R4 and R6 | John Hancock Bond Fund | Class R2  
Risk Return Abstract rr_RiskReturnAbstract  
Maximum front-end sales charge (load) on purchases, as a % of purchase price rr_MaximumCumulativeSalesChargeOverOther none
Maximum deferred sales charge (load) as a % of purchase or sale price, whichever is less rr_MaximumDeferredSalesChargeOverOther none
Small account fee (for fund account balances under $1,000) ($) rr_ShareholderFeeOther none
Management fee rr_ManagementFeesOverAssets 0.31%
Distribution and service (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Service plan fee rr_Component1OtherExpensesOverAssets 0.25% [2]
Additional other expenses rr_Component2OtherExpensesOverAssets 0.06%
Total other expenses rr_OtherExpensesOverAssets 0.31%
Total annual fund operating expenses rr_ExpensesOverAssets 0.87%
Contractual expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.01%) [1]
Total annual fund operating expenses after expense reimbursements rr_NetExpensesOverAssets 0.86%
1 year rr_ExpenseExampleYear01 $ 88
3 years rr_ExpenseExampleYear03 277
5 years rr_ExpenseExampleYear05 481
10 years rr_ExpenseExampleYear10 $ 1,072
1 year rr_AverageAnnualReturnYear01 (14.81%)
5 year rr_AverageAnnualReturnYear05 (0.02%)
10 year rr_AverageAnnualReturnYear10 1.53%
John Hancock Bond Fund Classes A C I R2 R4 and R6 | John Hancock Bond Fund | Class R4  
Risk Return Abstract rr_RiskReturnAbstract  
Maximum front-end sales charge (load) on purchases, as a % of purchase price rr_MaximumCumulativeSalesChargeOverOther none
Maximum deferred sales charge (load) as a % of purchase or sale price, whichever is less rr_MaximumDeferredSalesChargeOverOther none
Small account fee (for fund account balances under $1,000) ($) rr_ShareholderFeeOther none
Management fee rr_ManagementFeesOverAssets 0.31%
Distribution and service (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Service plan fee rr_Component1OtherExpensesOverAssets 0.10%
Additional other expenses rr_Component2OtherExpensesOverAssets 0.06%
Total other expenses rr_OtherExpensesOverAssets 0.16%
Total annual fund operating expenses rr_ExpensesOverAssets 0.72%
Contractual expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.11%) [1],[3]
Total annual fund operating expenses after expense reimbursements rr_NetExpensesOverAssets 0.61%
1 year rr_ExpenseExampleYear01 $ 62
3 years rr_ExpenseExampleYear03 219
5 years rr_ExpenseExampleYear05 390
10 years rr_ExpenseExampleYear10 $ 884
1 year rr_AverageAnnualReturnYear01 (14.53%)
5 year rr_AverageAnnualReturnYear05 0.23%
10 year rr_AverageAnnualReturnYear10 1.75%
John Hancock Bond Fund Classes A C I R2 R4 and R6 | John Hancock Bond Fund | Class R6  
Risk Return Abstract rr_RiskReturnAbstract  
Maximum front-end sales charge (load) on purchases, as a % of purchase price rr_MaximumCumulativeSalesChargeOverOther none
Maximum deferred sales charge (load) as a % of purchase or sale price, whichever is less rr_MaximumDeferredSalesChargeOverOther none
Small account fee (for fund account balances under $1,000) ($) rr_ShareholderFeeOther none
Management fee rr_ManagementFeesOverAssets 0.31%
Distribution and service (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Service plan fee rr_Component1OtherExpensesOverAssets none
Additional other expenses rr_Component2OtherExpensesOverAssets 0.06%
Total other expenses rr_OtherExpensesOverAssets 0.06%
Total annual fund operating expenses rr_ExpensesOverAssets 0.37%
Contractual expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.01%) [1]
Total annual fund operating expenses after expense reimbursements rr_NetExpensesOverAssets 0.36%
1 year rr_ExpenseExampleYear01 $ 37
3 years rr_ExpenseExampleYear03 118
5 years rr_ExpenseExampleYear05 207
10 years rr_ExpenseExampleYear10 $ 467
1 year rr_AverageAnnualReturnYear01 (14.37%)
5 year rr_AverageAnnualReturnYear05 0.48%
10 year rr_AverageAnnualReturnYear10 2.04%
John Hancock Bond Fund Classes A C I R2 R4 and R6 | John Hancock Bond Fund | Return After Taxes on Distributions | Class A  
Risk Return Abstract rr_RiskReturnAbstract  
1 year rr_AverageAnnualReturnYear01 (19.22%)
5 year rr_AverageAnnualReturnYear05 (2.17%)
10 year rr_AverageAnnualReturnYear10 (0.34%)
John Hancock Bond Fund Classes A C I R2 R4 and R6 | John Hancock Bond Fund | Return After Taxes on Distributions and Sale of Shares | Class A  
Risk Return Abstract rr_RiskReturnAbstract  
1 year rr_AverageAnnualReturnYear01 (10.68%)
5 year rr_AverageAnnualReturnYear05 (1.08%)
10 year rr_AverageAnnualReturnYear10 0.28%
John Hancock Bond Fund Classes A C I R2 R4 and R6 | John Hancock Bond Fund | Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)  
Risk Return Abstract rr_RiskReturnAbstract  
1 year rr_AverageAnnualReturnYear01 (13.01%)
5 year rr_AverageAnnualReturnYear05 0.02%
10 year rr_AverageAnnualReturnYear10 1.06%
[1] The advisor contractually agrees to waive a portion of its management fee and/or reimburse expenses for the fund and certain other John Hancock funds according to an asset level breakpoint schedule that is based on the aggregate net assets of all the funds participating in the waiver or reimbursement, including the fund (the participating portfolios). This waiver equals, on an annualized basis, 0.0100% of that portion of the aggregate net assets of all the participating portfolios that exceeds $75 billion but is less than or equal to $125 billion; 0.0125% of that portion of the aggregate net assets of all the participating portfolios that exceeds $125 billion but is less than or equal to $150 billion; 0.0150% of that portion of the aggregate net assets of all the participating portfolios that exceeds $150 billion but is less than or equal to $175 billion; 0.0175% of that portion of the aggregate net assets of all the participating portfolios that exceeds $175 billion but is less than or equal to $200 billion; 0.0200% of that portion of the aggregate net assets of all the participating portfolios that exceeds $200 billion but is less than or equal to $225 billion; and 0.0225% of that portion of the aggregate net assets of all the participating portfolios that exceeds $225 billion. The amount of the reimbursement is calculated daily and allocated among all the participating portfolios in proportion to the daily net assets of each participating portfolio. During its most recent fiscal year, the fund’s reimbursement amounted to 0.01% of the fund’s average daily net assets. This agreement expires on July 31, 2025, unless renewed by mutual agreement of the fund and the advisor based upon a determination that this is appropriate under the circumstances at that time.
[2] “Service plan fee” has been restated to reflect maximum allowable fees.
[3] The distributor contractually agrees to limit its Rule 12b-1 fees for Class R4 shares to 0.15%. This agreement expires on September 30, 2024, unless renewed by mutual agreement of the fund and the distributor based upon a determination that this is appropriate under the circumstances at that time.