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Shareholder Report
 6 Months Ended
Nov. 30, 2024
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
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 Nov. 30, 2024
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 semiannual shareholder report contains important information about the John Hancock Bond Fund (the fund) for the period of June 1, 2024 to November 30, 2024.
Shareholder Report Annual or Semi-Annual semi-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 six months ?
(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)		 $39 0.76%
Expenses Paid, Amount $ 39
Expense Ratio, Percent 0.76%
Net Assets $ 26,751,405,130
Holdings Count | Holding 1,090
Investment Company Portfolio Turnover 49.00%
Additional Fund Statistics [Text Block]
Fund Statistics
Fund net assets $26,751,405,130
Total number of portfolio holdings 1,090
Portfolio turnover rate 49%
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
Corporate bonds 36.3%
U.S. Government Agency 34.7%
U.S. Government 20.1%
Asset-backed securities 4.6%
Collateralized mortgage obligations – Commercial and residential 2.4%
Collateralized mortgage obligations – U.S. Government Agency 0.9%
Short-term investments and other 1.0%
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 11-30-24 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 11-30-24 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 semiannual shareholder report contains important information about the John Hancock Bond Fund (the fund) for the period of June 1, 2024 to November 30, 2024.
Shareholder Report Annual or Semi-Annual semi-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 six months ?
(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)		 $75 1.46%
Expenses Paid, Amount $ 75
Expense Ratio, Percent 1.46%
Net Assets $ 26,751,405,130
Holdings Count | Holding 1,090
Investment Company Portfolio Turnover 49.00%
Additional Fund Statistics [Text Block]
Fund Statistics
Fund net assets $26,751,405,130
Total number of portfolio holdings 1,090
Portfolio turnover rate 49%
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
Corporate bonds 36.3%
U.S. Government Agency 34.7%
U.S. Government 20.1%
Asset-backed securities 4.6%
Collateralized mortgage obligations – Commercial and residential 2.4%
Collateralized mortgage obligations – U.S. Government Agency 0.9%
Short-term investments and other 1.0%
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 11-30-24 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 11-30-24 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 semiannual shareholder report contains important information about the John Hancock Bond Fund (the fund) for the period of June 1, 2024 to November 30, 2024.
Shareholder Report Annual or Semi-Annual semi-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 six months ?
(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)		 $24 0.46%
Expenses Paid, Amount $ 24
Expense Ratio, Percent 0.46%
Net Assets $ 26,751,405,130
Holdings Count | Holding 1,090
Investment Company Portfolio Turnover 49.00%
Additional Fund Statistics [Text Block]
Fund Statistics
Fund net assets $26,751,405,130
Total number of portfolio holdings 1,090
Portfolio turnover rate 49%
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
Corporate bonds 36.3%
U.S. Government Agency 34.7%
U.S. Government 20.1%
Asset-backed securities 4.6%
Collateralized mortgage obligations – Commercial and residential 2.4%
Collateralized mortgage obligations – U.S. Government Agency 0.9%
Short-term investments and other 1.0%
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 11-30-24 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 11-30-24 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 semiannual shareholder report contains important information about the John Hancock Bond Fund (the fund) for the period of June 1, 2024 to November 30, 2024.
Shareholder Report Annual or Semi-Annual semi-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 six months ?
(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)		 $18 0.35%
Expenses Paid, Amount $ 18
Expense Ratio, Percent 0.35%
Net Assets $ 26,751,405,130
Holdings Count | Holding 1,090
Investment Company Portfolio Turnover 49.00%
Additional Fund Statistics [Text Block]
Fund Statistics
Fund net assets $26,751,405,130
Total number of portfolio holdings 1,090
Portfolio turnover rate 49%
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
Corporate bonds 36.3%
U.S. Government Agency 34.7%
U.S. Government 20.1%
Asset-backed securities 4.6%
Collateralized mortgage obligations – Commercial and residential 2.4%
Collateralized mortgage obligations – U.S. Government Agency 0.9%
Short-term investments and other 1.0%
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 11-30-24 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 11-30-24 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 semiannual shareholder report contains important information about the John Hancock Bond Fund (the fund) for the period of June 1, 2024 to November 30, 2024.
Shareholder Report Annual or Semi-Annual semi-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 six months ?
(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)		 $44 0.85%
Expenses Paid, Amount $ 44
Expense Ratio, Percent 0.85%
Net Assets $ 26,751,405,130
Holdings Count | Holding 1,090
Investment Company Portfolio Turnover 49.00%
Additional Fund Statistics [Text Block]
Fund Statistics
Fund net assets $26,751,405,130
Total number of portfolio holdings 1,090
Portfolio turnover rate 49%
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
Corporate bonds 36.3%
U.S. Government Agency 34.7%
U.S. Government 20.1%
Asset-backed securities 4.6%
Collateralized mortgage obligations – Commercial and residential 2.4%
Collateralized mortgage obligations – U.S. Government Agency 0.9%
Short-term investments and other 1.0%
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 11-30-24 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 11-30-24 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 semiannual shareholder report contains important information about the John Hancock Bond Fund (the fund) for the period of June 1, 2024 to November 30, 2024.
Shareholder Report Annual or Semi-Annual semi-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 six months ?
(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)		 $31 0.60%
Expenses Paid, Amount $ 31
Expense Ratio, Percent 0.60%
Net Assets $ 26,751,405,130
Holdings Count | Holding 1,090
Investment Company Portfolio Turnover 49.00%
Additional Fund Statistics [Text Block]
Fund Statistics
Fund net assets $26,751,405,130
Total number of portfolio holdings 1,090
Portfolio turnover rate 49%
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
Corporate bonds 36.3%
U.S. Government Agency 34.7%
U.S. Government 20.1%
Asset-backed securities 4.6%
Collateralized mortgage obligations – Commercial and residential 2.4%
Collateralized mortgage obligations – U.S. Government Agency 0.9%
Short-term investments and other 1.0%
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 11-30-24 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 11-30-24 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 semiannual shareholder report contains important information about the John Hancock Bond Fund (the fund) for the period of June 1, 2024 to November 30, 2024.
Shareholder Report Annual or Semi-Annual semi-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 six months ?
(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)		 $18 0.35%
Expenses Paid, Amount $ 18
Expense Ratio, Percent 0.35%
Net Assets $ 26,751,405,130
Holdings Count | Holding 1,090
Investment Company Portfolio Turnover 49.00%
Additional Fund Statistics [Text Block]
Fund Statistics
Fund net assets $26,751,405,130
Total number of portfolio holdings 1,090
Portfolio turnover rate 49%
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
Corporate bonds 36.3%
U.S. Government Agency 34.7%
U.S. Government 20.1%
Asset-backed securities 4.6%
Collateralized mortgage obligations – Commercial and residential 2.4%
Collateralized mortgage obligations – U.S. Government Agency 0.9%
Short-term investments and other 1.0%
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 11-30-24 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 11-30-24 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.