v3.25.2
Shareholder Report
12 Months Ended
May 31, 2025
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSR
Amendment Flag false
Registrant Name JOHN HANCOCK SOVEREIGN BOND FUND
Entity Central Index Key 0000045288
Entity Investment Company Type N-1A
Document Period End Date May 31, 2025
C000001854 [Member]  
Shareholder Report [Line Items]  
Fund Name John Hancock Bond Fund
Class Name Class A
Trading Symbol JHNBX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the John Hancock Bond Fund (the fund) for the period of June 1, 2024 to May 31, 2025.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at jhinvestments.com/documents. You can also request this information by contacting us at 800-225-5291.
Additional Information Phone Number 800-225-5291
Additional Information Website jhinvestments.com/documents
Expenses [Text Block]
What were the fund costs during the last year ?
(Based on a hypothetical $10,000 investment)
Fund (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
Bond Fund
(Class A/JHNBX)
$78 0.76%
Expenses Paid, Amount $ 78
Expense Ratio, Percent 0.76%
Factors Affecting Performance [Text Block]
Management’s Discussion of Fund Performance

SUMMARY OF RESULTS
Bond Fund (Class A/JHNBX) returned 5.32% (excluding sales charges) for the year ended May 31, 2025. The U.S. bond market produced broad-based gains in the annual period, with positive price performance augmenting the contribution from income. Investors were cheered by the backdrop of falling inflation, moderate economic growth, and interest rate cuts by the U.S. Federal Reserve. Credit-oriented market segments generally outperformed, reflecting a hearty appetite for risk among market participants.
TOP PERFORMANCE CONTRIBUTORS
Agency mortgage-backed securities | The fund’s allocation to this area made the largest contribution to absolute performance due to the combination of positive total returns and a sizable portfolio weighting.
Investment-grade corporates | This segment of the fund also made a meaningful contribution, led by Charter Communications Operating LLC, Enbridge, Inc., and Paramount Global.
Other contributing sectors | An allocation to U.S. Treasuries and government debt also contributed, as did holdings in high-yield bonds, asset-backed securities, commercial mortgage-backed securities, and emerging-market corporate issues.
TOP PERFORMANCE DETRACTORS
A small number of individual securities | Although many of the fund’s positions registered positive absolute returns, certain holdings, including Occidental Petroleum Corp., finished with losses.
Saks Global Enterprises | A position in the bonds of the luxury retailer lost ground, as did holdings in specific longer-dated U.S. Treasury issues and U.S. Treasury futures.
The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. 
Performance Past Does Not Indicate Future [Text] Past performance does not guarantee future results.
Line Graph [Table Text Block]
Fund Performance
The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $10,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period.
GROWTH OF $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years
Bond Fund (Class A/JHNBX) 1.12% (0.96)% 1.38%
Bond Fund (Class A/JHNBX)—excluding sales charge 5.32% (0.15)% 1.80%
Bloomberg U.S. Aggregate Bond Index 5.46% (0.90)% 1.49%
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Updated Performance Information Location [Text Block] Due to market volatility and other factors, the fund’s current performance may be higher or lower than the performance shown and can be found at jhinvestments.com/investments or by calling 800-225-5291.
Net Assets $ 26,129,016,250
Holdings Count | Holding 1,107
Advisory Fees Paid, Amount $ 78,343,545
Investment Company Portfolio Turnover 100.00%
Additional Fund Statistics [Text Block]
Fund Statistics
Fund net assets $26,129,016,250
Total number of portfolio holdings 1,107
Total advisory fees paid (net) $78,343,545
Portfolio turnover rate 100%
Holdings [Text Block]
Graphical Representation of Holdings
The tables below show the investment makeup of the fund, representing a percentage of the total net assets of the fund.
Portfolio Composition
U.S. Government Agency 36.1%
Corporate bonds 35.5%
U.S. Government 18.8%
Asset-backed securities 4.7%
Collateralized mortgage obligations – Commercial and residential 2.6%
Collateralized mortgage obligations – U.S. Government Agency 1.0%
Term loans 0.3%
Preferred securities 0.1%
Short-term investments and other 0.9%
Quality Composition
Graphical Representation - Allocation 1 Chart
Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. “Not rated” securities are those with no ratings available from these agencies. All ratings are as of 5-31-25 and do not reflect subsequent downgrades or upgrades, if any.
Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time.
Credit Quality Explanation [Text Block]
Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. “Not rated” securities are those with no ratings available from these agencies. All ratings are as of 5-31-25 and do not reflect subsequent downgrades or upgrades, if any.
Credit Ratings Selection [Text Block] Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc.
C000001856 [Member]  
Shareholder Report [Line Items]  
Fund Name John Hancock Bond Fund
Class Name Class C
Trading Symbol JHCBX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the John Hancock Bond Fund (the fund) for the period of June 1, 2024 to May 31, 2025.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at jhinvestments.com/documents. You can also request this information by contacting us at 800-225-5291.
Additional Information Phone Number 800-225-5291
Additional Information Website jhinvestments.com/documents
Expenses [Text Block]
What were the fund costs during the last year ?
(Based on a hypothetical $10,000 investment)
Fund (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
Bond Fund
(Class C/JHCBX)
$149 1.46%
Expenses Paid, Amount $ 149
Expense Ratio, Percent 1.46%
Factors Affecting Performance [Text Block]
Management’s Discussion of Fund Performance

SUMMARY OF RESULTS
Bond Fund (Class C/JHCBX) returned 4.59% (excluding sales charges) for the year ended May 31, 2025. The U.S. bond market produced broad-based gains in the annual period, with positive price performance augmenting the contribution from income. Investors were cheered by the backdrop of falling inflation, moderate economic growth, and interest rate cuts by the U.S. Federal Reserve. Credit-oriented market segments generally outperformed, reflecting a hearty appetite for risk among market participants.
TOP PERFORMANCE CONTRIBUTORS
Agency mortgage-backed securities | The fund’s allocation to this area made the largest contribution to absolute performance due to the combination of positive total returns and a sizable portfolio weighting.
Investment-grade corporates | This segment of the fund also made a meaningful contribution, led by Charter Communications Operating LLC, Enbridge, Inc., and Paramount Global.
Other contributing sectors | An allocation to U.S. Treasuries and government debt also contributed, as did holdings in high-yield bonds, asset-backed securities, commercial mortgage-backed securities, and emerging-market corporate issues.
TOP PERFORMANCE DETRACTORS
A small number of individual securities | Although many of the fund’s positions registered positive absolute returns, certain holdings, including Occidental Petroleum Corp., finished with losses.
Saks Global Enterprises | A position in the bonds of the luxury retailer lost ground, as did holdings in specific longer-dated U.S. Treasury issues and U.S. Treasury futures.
The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. 
Performance Past Does Not Indicate Future [Text] Past performance does not guarantee future results.
Line Graph [Table Text Block]
Fund Performance
The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $10,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period.
GROWTH OF $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years
Bond Fund (Class C/JHCBX) 3.59% (0.85)% 1.09%
Bond Fund (Class C/JHCBX)—excluding sales charge 4.59% (0.85)% 1.09%
Bloomberg U.S. Aggregate Bond Index 5.46% (0.90)% 1.49%
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Updated Performance Information Location [Text Block] Due to market volatility and other factors, the fund’s current performance may be higher or lower than the performance shown and can be found at jhinvestments.com/investments or by calling 800-225-5291.
Net Assets $ 26,129,016,250
Holdings Count | Holding 1,107
Advisory Fees Paid, Amount $ 78,343,545
Investment Company Portfolio Turnover 100.00%
Additional Fund Statistics [Text Block]
Fund Statistics
Fund net assets $26,129,016,250
Total number of portfolio holdings 1,107
Total advisory fees paid (net) $78,343,545
Portfolio turnover rate 100%
Holdings [Text Block]
Graphical Representation of Holdings
The tables below show the investment makeup of the fund, representing a percentage of the total net assets of the fund.
Portfolio Composition
U.S. Government Agency 36.1%
Corporate bonds 35.5%
U.S. Government 18.8%
Asset-backed securities 4.7%
Collateralized mortgage obligations – Commercial and residential 2.6%
Collateralized mortgage obligations – U.S. Government Agency 1.0%
Term loans 0.3%
Preferred securities 0.1%
Short-term investments and other 0.9%
Quality Composition
Graphical Representation - Allocation 1 Chart
Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. “Not rated” securities are those with no ratings available from these agencies. All ratings are as of 5-31-25 and do not reflect subsequent downgrades or upgrades, if any.
Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time.
Credit Quality Explanation [Text Block]
Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. “Not rated” securities are those with no ratings available from these agencies. All ratings are as of 5-31-25 and do not reflect subsequent downgrades or upgrades, if any.
Credit Ratings Selection [Text Block] Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc.
C000001857 [Member]  
Shareholder Report [Line Items]  
Fund Name John Hancock Bond Fund
Class Name Class I
Trading Symbol JHBIX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the John Hancock Bond Fund (the fund) for the period of June 1, 2024 to May 31, 2025.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at jhinvestments.com/documents. You can also request this information by contacting us at 800-225-5291.
Additional Information Phone Number 800-225-5291
Additional Information Website jhinvestments.com/documents
Expenses [Text Block]
What were the fund costs during the last year ?
(Based on a hypothetical $10,000 investment)
Fund (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
Bond Fund
(Class I/JHBIX)
$47 0.46%
Expenses Paid, Amount $ 47
Expense Ratio, Percent 0.46%
Factors Affecting Performance [Text Block]
Management’s Discussion of Fund Performance

SUMMARY OF RESULTS
Bond Fund (Class I/JHBIX) returned 5.64% for the year ended May 31, 2025. The U.S. bond market produced broad-based gains in the annual period, with positive price performance augmenting the contribution from income. Investors were cheered by the backdrop of falling inflation, moderate economic growth, and interest rate cuts by the U.S. Federal Reserve. Credit-oriented market segments generally outperformed, reflecting a hearty appetite for risk among market participants.
TOP PERFORMANCE CONTRIBUTORS
Agency mortgage-backed securities | The fund’s allocation to this area made the largest contribution to absolute performance due to the combination of positive total returns and a sizable portfolio weighting.
Investment-grade corporates | This segment of the fund also made a meaningful contribution, led by Charter Communications Operating LLC, Enbridge, Inc., and Paramount Global.
Other contributing sectors | An allocation to U.S. Treasuries and government debt also contributed, as did holdings in high-yield bonds, asset-backed securities, commercial mortgage-backed securities, and emerging-market corporate issues.
TOP PERFORMANCE DETRACTORS
A small number of individual securities | Although many of the fund’s positions registered positive absolute returns, certain holdings, including Occidental Petroleum Corp., finished with losses.
Saks Global Enterprises | A position in the bonds of the luxury retailer lost ground, as did holdings in specific longer-dated U.S. Treasury issues and U.S. Treasury futures.
The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. 
Performance Past Does Not Indicate Future [Text] Past performance does not guarantee future results.
Line Graph [Table Text Block]
Fund Performance
The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $250,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period.
GROWTH OF $250,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years
Bond Fund (Class I/JHBIX) 5.64% 0.15% 2.10%
Bloomberg U.S. Aggregate Bond Index 5.46% (0.90)% 1.49%
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Updated Performance Information Location [Text Block] Due to market volatility and other factors, the fund’s current performance may be higher or lower than the performance shown and can be found at jhinvestments.com/investments or by calling 800-225-5291.
Net Assets $ 26,129,016,250
Holdings Count | Holding 1,107
Advisory Fees Paid, Amount $ 78,343,545
Investment Company Portfolio Turnover 100.00%
Additional Fund Statistics [Text Block]
Fund Statistics
Fund net assets $26,129,016,250
Total number of portfolio holdings 1,107
Total advisory fees paid (net) $78,343,545
Portfolio turnover rate 100%
Holdings [Text Block]
Graphical Representation of Holdings
The tables below show the investment makeup of the fund, representing a percentage of the total net assets of the fund.
Portfolio Composition
U.S. Government Agency 36.1%
Corporate bonds 35.5%
U.S. Government 18.8%
Asset-backed securities 4.7%
Collateralized mortgage obligations – Commercial and residential 2.6%
Collateralized mortgage obligations – U.S. Government Agency 1.0%
Term loans 0.3%
Preferred securities 0.1%
Short-term investments and other 0.9%
Quality Composition
Graphical Representation - Allocation 1 Chart
Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. “Not rated” securities are those with no ratings available from these agencies. All ratings are as of 5-31-25 and do not reflect subsequent downgrades or upgrades, if any.
Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time.
Credit Quality Explanation [Text Block]
Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. “Not rated” securities are those with no ratings available from these agencies. All ratings are as of 5-31-25 and do not reflect subsequent downgrades or upgrades, if any.
Credit Ratings Selection [Text Block] Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc.
C000153977 [Member]  
Shareholder Report [Line Items]  
Fund Name John Hancock Bond Fund
Class Name Class NAV
No Trading Symbol Flag true
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the John Hancock Bond Fund (the fund) for the period of June 1, 2024 to May 31, 2025.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at jhinvestments.com/underlying-funds. You can also request this information by contacting us at 800-344-1029.
Additional Information Phone Number 800-344-1029
Additional Information Website jhinvestments.com/underlying-funds
Expenses [Text Block]
What were the fund costs during the last year ?
(Based on a hypothetical $10,000 investment)
Fund (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
Bond Fund
(Class NAV)
$36 0.35%
Expenses Paid, Amount $ 36
Expense Ratio, Percent 0.35%
Factors Affecting Performance [Text Block]
Management’s Discussion of Fund Performance

SUMMARY OF RESULTS
Bond Fund (Class NAV) returned 5.76% for the year ended May 31, 2025. The U.S. bond market produced broad-based gains in the annual period, with positive price performance augmenting the contribution from income. Investors were cheered by the backdrop of falling inflation, moderate economic growth, and interest rate cuts by the U.S. Federal Reserve. Credit-oriented market segments generally outperformed, reflecting a hearty appetite for risk among market participants.
TOP PERFORMANCE CONTRIBUTORS
Agency mortgage-backed securities | The fund’s allocation to this area made the largest contribution to absolute performance due to the combination of positive total returns and a sizable portfolio weighting.
Investment-grade corporates | This segment of the fund also made a meaningful contribution, led by Charter Communications Operating LLC, Enbridge, Inc., and Paramount Global.
Other contributing sectors | An allocation to U.S. Treasuries and government debt also contributed, as did holdings in high-yield bonds, asset-backed securities, commercial mortgage-backed securities, and emerging-market corporate issues.
TOP PERFORMANCE DETRACTORS
A small number of individual securities | Although many of the fund’s positions registered positive absolute returns, certain holdings, including Occidental Petroleum Corp., finished with losses.
Saks Global Enterprises | A position in the bonds of the luxury retailer lost ground, as did holdings in specific longer-dated U.S. Treasury issues and U.S. Treasury futures.
The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. 
Performance Past Does Not Indicate Future [Text] Past performance does not guarantee future results.
Line Graph [Table Text Block]
Fund Performance
The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $10,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period.
GROWTH OF $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years
Bond Fund (Class NAV) 5.76% 0.27% 2.22%
Bloomberg U.S. Aggregate Bond Index 5.46% (0.90)% 1.49%
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Net Assets $ 26,129,016,250
Holdings Count | Holding 1,107
Advisory Fees Paid, Amount $ 78,343,545
Investment Company Portfolio Turnover 100.00%
Additional Fund Statistics [Text Block]
Fund Statistics
Fund net assets $26,129,016,250
Total number of portfolio holdings 1,107
Total advisory fees paid (net) $78,343,545
Portfolio turnover rate 100%
Holdings [Text Block]
Graphical Representation of Holdings
The tables below show the investment makeup of the fund, representing a percentage of the total net assets of the fund.
Portfolio Composition
U.S. Government Agency 36.1%
Corporate bonds 35.5%
U.S. Government 18.8%
Asset-backed securities 4.7%
Collateralized mortgage obligations – Commercial and residential 2.6%
Collateralized mortgage obligations – U.S. Government Agency 1.0%
Term loans 0.3%
Preferred securities 0.1%
Short-term investments and other 0.9%
Quality Composition
Graphical Representation - Allocation 1 Chart
Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. “Not rated” securities are those with no ratings available from these agencies. All ratings are as of 5-31-25 and do not reflect subsequent downgrades or upgrades, if any.
Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time.
Credit Quality Explanation [Text Block]
Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. “Not rated” securities are those with no ratings available from these agencies. All ratings are as of 5-31-25 and do not reflect subsequent downgrades or upgrades, if any.
Credit Ratings Selection [Text Block] Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc.
C000113488 [Member]  
Shareholder Report [Line Items]  
Fund Name John Hancock Bond Fund
Class Name Class R2
Trading Symbol JHRBX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the John Hancock Bond Fund (the fund) for the period of June 1, 2024 to May 31, 2025.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at jhinvestments.com/documents. You can also request this information by contacting us at 800-225-5291.
Additional Information Phone Number 800-225-5291
Additional Information Website jhinvestments.com/documents
Expenses [Text Block]
What were the fund costs during the last year ?
(Based on a hypothetical $10,000 investment)
Fund (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
Bond Fund
(Class R2/JHRBX)
$87 0.85%
Expenses Paid, Amount $ 87
Expense Ratio, Percent 0.85%
Factors Affecting Performance [Text Block]
Management’s Discussion of Fund Performance

SUMMARY OF RESULTS
Bond Fund (Class R2/JHRBX) returned 5.15% for the year ended May 31, 2025. The U.S. bond market produced broad-based gains in the annual period, with positive price performance augmenting the contribution from income. Investors were cheered by the backdrop of falling inflation, moderate economic growth, and interest rate cuts by the U.S. Federal Reserve. Credit-oriented market segments generally outperformed, reflecting a hearty appetite for risk among market participants.
TOP PERFORMANCE CONTRIBUTORS
Agency mortgage-backed securities | The fund’s allocation to this area made the largest contribution to absolute performance due to the combination of positive total returns and a sizable portfolio weighting.
Investment-grade corporates | This segment of the fund also made a meaningful contribution, led by Charter Communications Operating LLC, Enbridge, Inc., and Paramount Global.
Other contributing sectors | An allocation to U.S. Treasuries and government debt also contributed, as did holdings in high-yield bonds, asset-backed securities, commercial mortgage-backed securities, and emerging-market corporate issues.
TOP PERFORMANCE DETRACTORS
A small number of individual securities | Although many of the fund’s positions registered positive absolute returns, certain holdings, including Occidental Petroleum Corp., finished with losses.
Saks Global Enterprises | A position in the bonds of the luxury retailer lost ground, as did holdings in specific longer-dated U.S. Treasury issues and U.S. Treasury futures.
The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. 
Performance Past Does Not Indicate Future [Text] Past performance does not guarantee future results.
Line Graph [Table Text Block]
Fund Performance
The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $10,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period.
GROWTH OF $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years
Bond Fund (Class R2/JHRBX) 5.15% (0.25)% 1.70%
Bloomberg U.S. Aggregate Bond Index 5.46% (0.90)% 1.49%
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Updated Performance Information Location [Text Block] Due to market volatility and other factors, the fund’s current performance may be higher or lower than the performance shown and can be found at jhinvestments.com/investments or by calling 800-225-5291.
Net Assets $ 26,129,016,250
Holdings Count | Holding 1,107
Advisory Fees Paid, Amount $ 78,343,545
Investment Company Portfolio Turnover 100.00%
Additional Fund Statistics [Text Block]
Fund Statistics
Fund net assets $26,129,016,250
Total number of portfolio holdings 1,107
Total advisory fees paid (net) $78,343,545
Portfolio turnover rate 100%
Holdings [Text Block]
Graphical Representation of Holdings
The tables below show the investment makeup of the fund, representing a percentage of the total net assets of the fund.
Portfolio Composition
U.S. Government Agency 36.1%
Corporate bonds 35.5%
U.S. Government 18.8%
Asset-backed securities 4.7%
Collateralized mortgage obligations – Commercial and residential 2.6%
Collateralized mortgage obligations – U.S. Government Agency 1.0%
Term loans 0.3%
Preferred securities 0.1%
Short-term investments and other 0.9%
Quality Composition
Graphical Representation - Allocation 1 Chart
Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. “Not rated” securities are those with no ratings available from these agencies. All ratings are as of 5-31-25 and do not reflect subsequent downgrades or upgrades, if any.
Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time.
Credit Quality Explanation [Text Block]
Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. “Not rated” securities are those with no ratings available from these agencies. All ratings are as of 5-31-25 and do not reflect subsequent downgrades or upgrades, if any.
Credit Ratings Selection [Text Block] Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc.
C000153978 [Member]  
Shareholder Report [Line Items]  
Fund Name John Hancock Bond Fund
Class Name Class R4
Trading Symbol JBFRX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the John Hancock Bond Fund (the fund) for the period of June 1, 2024 to May 31, 2025.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at jhinvestments.com/documents. You can also request this information by contacting us at 800-225-5291.
Additional Information Phone Number 800-225-5291
Additional Information Website jhinvestments.com/documents
Expenses [Text Block]
What were the fund costs during the last year ?
(Based on a hypothetical $10,000 investment)
Fund (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
Bond Fund
(Class R4/JBFRX)
$62 0.60%
Expenses Paid, Amount $ 62
Expense Ratio, Percent 0.60%
Factors Affecting Performance [Text Block]
Management’s Discussion of Fund Performance

SUMMARY OF RESULTS
Bond Fund (Class R4/JBFRX) returned 5.49% for the year ended May 31, 2025. The U.S. bond market produced broad-based gains in the annual period, with positive price performance augmenting the contribution from income. Investors were cheered by the backdrop of falling inflation, moderate economic growth, and interest rate cuts by the U.S. Federal Reserve. Credit-oriented market segments generally outperformed, reflecting a hearty appetite for risk among market participants.
TOP PERFORMANCE CONTRIBUTORS
Agency mortgage-backed securities | The fund’s allocation to this area made the largest contribution to absolute performance due to the combination of positive total returns and a sizable portfolio weighting.
Investment-grade corporates | This segment of the fund also made a meaningful contribution, led by Charter Communications Operating LLC, Enbridge, Inc., and Paramount Global.
Other contributing sectors | An allocation to U.S. Treasuries and government debt also contributed, as did holdings in high-yield bonds, asset-backed securities, commercial mortgage-backed securities, and emerging-market corporate issues.
TOP PERFORMANCE DETRACTORS
A small number of individual securities | Although many of the fund’s positions registered positive absolute returns, certain holdings, including Occidental Petroleum Corp., finished with losses.
Saks Global Enterprises | A position in the bonds of the luxury retailer lost ground, as did holdings in specific longer-dated U.S. Treasury issues and U.S. Treasury futures.
The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. 
Performance Past Does Not Indicate Future [Text] Past performance does not guarantee future results.
Line Graph [Table Text Block]
Fund Performance
The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $10,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period.
GROWTH OF $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years
Bond Fund (Class R4/JBFRX) 5.49% 0.02% 1.97%
Bloomberg U.S. Aggregate Bond Index 5.46% (0.90)% 1.49%
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Updated Performance Information Location [Text Block] Due to market volatility and other factors, the fund’s current performance may be higher or lower than the performance shown and can be found at jhinvestments.com/investments or by calling 800-225-5291.
Net Assets $ 26,129,016,250
Holdings Count | Holding 1,107
Advisory Fees Paid, Amount $ 78,343,545
Investment Company Portfolio Turnover 100.00%
Additional Fund Statistics [Text Block]
Fund Statistics
Fund net assets $26,129,016,250
Total number of portfolio holdings 1,107
Total advisory fees paid (net) $78,343,545
Portfolio turnover rate 100%
Holdings [Text Block]
Graphical Representation of Holdings
The tables below show the investment makeup of the fund, representing a percentage of the total net assets of the fund.
Portfolio Composition
U.S. Government Agency 36.1%
Corporate bonds 35.5%
U.S. Government 18.8%
Asset-backed securities 4.7%
Collateralized mortgage obligations – Commercial and residential 2.6%
Collateralized mortgage obligations – U.S. Government Agency 1.0%
Term loans 0.3%
Preferred securities 0.1%
Short-term investments and other 0.9%
Quality Composition
Graphical Representation - Allocation 1 Chart
Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. “Not rated” securities are those with no ratings available from these agencies. All ratings are as of 5-31-25 and do not reflect subsequent downgrades or upgrades, if any.
Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time.
Credit Quality Explanation [Text Block]
Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. “Not rated” securities are those with no ratings available from these agencies. All ratings are as of 5-31-25 and do not reflect subsequent downgrades or upgrades, if any.
Credit Ratings Selection [Text Block] Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc.
C000106442 [Member]  
Shareholder Report [Line Items]  
Fund Name John Hancock Bond Fund
Class Name Class R6
Trading Symbol JHBSX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the John Hancock Bond Fund (the fund) for the period of June 1, 2024 to May 31, 2025.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at jhinvestments.com/documents. You can also request this information by contacting us at 800-225-5291.
Additional Information Phone Number 800-225-5291
Additional Information Website jhinvestments.com/documents
Expenses [Text Block]
What were the fund costs during the last year ?
(Based on a hypothetical $10,000 investment)
Fund (Class) Costs of a $10,000 investment Costs paid as a percentage
of a $10,000 investment
Bond Fund
(Class R6/JHBSX)
$36 0.35%
Expenses Paid, Amount $ 36
Expense Ratio, Percent 0.35%
Factors Affecting Performance [Text Block]
Management’s Discussion of Fund Performance

SUMMARY OF RESULTS
Bond Fund (Class R6/JHBSX) returned 5.67% for the year ended May 31, 2025. The U.S. bond market produced broad-based gains in the annual period, with positive price performance augmenting the contribution from income. Investors were cheered by the backdrop of falling inflation, moderate economic growth, and interest rate cuts by the U.S. Federal Reserve. Credit-oriented market segments generally outperformed, reflecting a hearty appetite for risk among market participants.
TOP PERFORMANCE CONTRIBUTORS
Agency mortgage-backed securities | The fund’s allocation to this area made the largest contribution to absolute performance due to the combination of positive total returns and a sizable portfolio weighting.
Investment-grade corporates | This segment of the fund also made a meaningful contribution, led by Charter Communications Operating LLC, Enbridge, Inc., and Paramount Global.
Other contributing sectors | An allocation to U.S. Treasuries and government debt also contributed, as did holdings in high-yield bonds, asset-backed securities, commercial mortgage-backed securities, and emerging-market corporate issues.
TOP PERFORMANCE DETRACTORS
A small number of individual securities | Although many of the fund’s positions registered positive absolute returns, certain holdings, including Occidental Petroleum Corp., finished with losses.
Saks Global Enterprises | A position in the bonds of the luxury retailer lost ground, as did holdings in specific longer-dated U.S. Treasury issues and U.S. Treasury futures.
The views expressed in this report are exclusively those of the portfolio management team at Manulife Investment Management (US) LLC, and are subject to change. They are not meant as investment advice. 
Performance Past Does Not Indicate Future [Text] Past performance does not guarantee future results.
Line Graph [Table Text Block]
Fund Performance
The following graph compares the initial and subsequent account values at the end of each of the most recently completed 10 fiscal years of the fund (or for the life of the fund, if shorter). It assumes a $1,000,000 initial investment in the fund and in an appropriate, broad-based securities market index for the same period.
GROWTH OF $1,000,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
AVERAGE ANNUAL TOTAL RETURN 1 Year 5 Years 10 Years
Bond Fund (Class R6/JHBSX) 5.67% 0.25% 2.22%
Bloomberg U.S. Aggregate Bond Index 5.46% (0.90)% 1.49%
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Updated Performance Information Location [Text Block] Due to market volatility and other factors, the fund’s current performance may be higher or lower than the performance shown and can be found at jhinvestments.com/investments or by calling 800-225-5291.
Net Assets $ 26,129,016,250
Holdings Count | Holding 1,107
Advisory Fees Paid, Amount $ 78,343,545
Investment Company Portfolio Turnover 100.00%
Additional Fund Statistics [Text Block]
Fund Statistics
Fund net assets $26,129,016,250
Total number of portfolio holdings 1,107
Total advisory fees paid (net) $78,343,545
Portfolio turnover rate 100%
Holdings [Text Block]
Graphical Representation of Holdings
The tables below show the investment makeup of the fund, representing a percentage of the total net assets of the fund.
Portfolio Composition
U.S. Government Agency 36.1%
Corporate bonds 35.5%
U.S. Government 18.8%
Asset-backed securities 4.7%
Collateralized mortgage obligations – Commercial and residential 2.6%
Collateralized mortgage obligations – U.S. Government Agency 1.0%
Term loans 0.3%
Preferred securities 0.1%
Short-term investments and other 0.9%
Quality Composition
Graphical Representation - Allocation 1 Chart
Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. “Not rated” securities are those with no ratings available from these agencies. All ratings are as of 5-31-25 and do not reflect subsequent downgrades or upgrades, if any.
Holdings may not have been held by the fund for the entire period and are subject to change without notice. Portfolio composition is subject to review in accordance with the fund’s investment strategy and may vary in the future. Current and future portfolio holdings are subject to risk and may change at any time.
Credit Quality Explanation [Text Block]
Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc. “Not rated” securities are those with no ratings available from these agencies. All ratings are as of 5-31-25 and do not reflect subsequent downgrades or upgrades, if any.
Credit Ratings Selection [Text Block] Ratings are from Moody’s Investors Service, Inc. If not available, we have used S&P Global Ratings. In the absence of ratings from these agencies, we have used Fitch Ratings, Inc.