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N-2 - USD ($) | 3 Months Ended | 12 Months Ended |  |  |  |  |
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Oct. 31, 2024 | Jul. 31, 2024 | Apr. 30, 2024 | Jan. 31, 2024 | Oct. 31, 2023 | Jul. 31, 2023 | Apr. 30, 2023 | Jan. 31, 2023 | Oct. 31, 2024 | Oct. 31, 2019 | Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2016 | Oct. 31, 2015
Cover [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Entity Central Index Key |  |  |  |  |  |  |  |  |  | 0000855886 |  |  |  |  |
Amendment Flag |  |  |  |  |  |  |  |  |  | false |  |  |  |  |
Entity Inv Company Type |  |  |  |  |  |  |  |  |  | N-2 |  |  |  |  |
Document Type |  |  |  |  |  |  |  |  |  | N-CSR |  |  |  |  |
Entity Registrant Name |  |  |  |  |  |  |  |  |  | JOHN HANCOCK PREMIUM DIVIDEND FUND |  |  |  |  |
Fee Table [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholder Transaction Expenses [Table Text Block] |  |  |  |  |  |  |  |  |  |
Shareholder Transaction Expenses |
Sales load (as a percentage of offering price) 1 | —%
Offering expenses (as a percentage of offering price) 1 | —%
Dividend Reinvestment Plan fees 2 | None
1 | If common shares are sold to or through underwriters, the fund’s prospectus will set forth any applicable sales load and the estimated offering expenses.
2 | Participants in the fund’s dividend reinvestment plan do not pay brokerage charges with respect to common shares issued directly by the fund. However, whenever common shares are purchased or sold on the NYSE or otherwise on the open market, each participant will pay a pro rata portion of brokerage trading fees, currently $0.05 per share purchased or sold. Brokerage trading fees will be deducted from amounts to be invested. Shareholders participating in the Plan may buy additional common shares of the fund through the Plan at any time and will be charged a $5 transaction fee plus $0.05 per share brokerage trading fee for each order. See “Dividends and dist ributi ons” and “Dividend reinvestment plan”.
Sales Load [Percent] | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend Reinvestment and Cash Purchase Fees | [2] |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |
Other Transaction Expenses [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Transaction Expenses [Percent] | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual Expenses [Table Text Block] |  |  |  |  |  |  |  |  |  | Summary of fund expenses
Annual Expenses (Percentage of Net Assets Attributable to Common Shares) |
Management fees 3 | 1.29%
Interest payments on borrowed funds 4 | 3.72%
Other expenses | 0.25%
Total Annual Operating Expenses | 5.26%
Contractual Expense Reimbursement 5 | (0.01)%
Total Annual Fund Operating Expenses After Expense Reimbursements | 5.25%
3 | See "Note 5 – Fees and transactions with affiliates.”
4 | The fund uses leverage by borrowing under a liquidity agreement. “Interest payments on borrowed funds” includes all interest paid in connection with outstanding loans. See “Note 8 - “Liquidity Agreement.”
5 | The Advisor has contractually agreed to waive a portion of its management fee and/or reimburse expenses for certain funds of the John Hancock group of funds complex, including the fund (the participating portfolios). This waiver is based upon aggregate managed assets of all the participating portfolios. The amount of the reimbursement is calculated daily and allocated among all the participating portfolios in proportion to the daily net assets of each fund. During the year ended October 31, 2024, this waiver amounted to 0.01% of the fund’s average daily net assets. This agreement expires on July 31, 2026, 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.
Management Fees [Percent] | [3] |  |  |  |  |  |  |  |  | 1.29% |  |  |  |  |
Interest Expenses on Borrowings [Percent] | [4] |  |  |  |  |  |  |  |  | 3.72% |  |  |  |  |
Other Annual Expenses [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Annual Expenses [Percent] |  |  |  |  |  |  |  |  |  | 0.25% |  |  |  |  |
Total Annual Expenses [Percent] |  |  |  |  |  |  |  |  |  | 5.26% |  |  |  |  |
Waivers and Reimbursements of Fees [Percent] | [5] |  |  |  |  |  |  |  |  | (0.01%) |  |  |  |  |
Net Expense over Assets [Percent] |  |  |  |  |  |  |  |  |  | 5.25% |  |  |  |  |
Expense Example [Table Text Block] |  |  |  |  |  |  |  |  |  | Example The following example illustrates the expenses that Common Shareholders would pay on a $1,000 investment in co mm on shares, assuming (i) total annual expenses set forth above, including any reimbursements through their current expiration date; ; (ii) (a 5% annual return; and (iii) all distributions are reinvested at NAV:
| 1 Year | 3 Years | 5 Years | 10 Years
Total Expenses | $52 | $157 | $261 | $519
The above table and example and the assumption in the example of a 5% annual return are required by regulations of the SEC that are applicable to all investment companies; the assumed 5% annual return is not a prediction of, and does not represent, the projected or actual performance of the fund’s common shares. For more complete descriptions of certain of the fund’s costs and expenses, see “Management of the Fund” in the fund’s prospectus. In addition, while the example assumes reinvestment of all dividends and distributions at NAV, participants in the Fund’s dividend reinvestment plan may receive Common Shares purchased or issued at a price or value different from NAV. See “Distribution Policy” and “Dividend Reinvestment Plan” in the fund’s prospectus. The example should not be considered a representation of past or future expenses, and the fund’s actual expenses may be greater or less than those shown. Moreover, the fund’s actual rate of return may be greater or less than the hypothetical 5% return shown in the example. |  |  |  |  |
Expense Example, Year 01 |  |  |  |  |  |  |  |  |  | $ 52 |  |  |  |  |
Expense Example, Years 1 to 3 |  |  |  |  |  |  |  |  |  | 157 |  |  |  |  |
Expense Example, Years 1 to 5 |  |  |  |  |  |  |  |  |  | 261 |  |  |  |  |
Expense Example, Years 1 to 10 |  |  |  |  |  |  |  |  |  | $ 519 |  |  |  |  |
Purpose of Fee Table , Note [Text Block] |  |  |  |  |  |  |  |  |  | The following information is presented in conformance with annual reporting requirements for funds that have filed a registration statement pursuant to General Instruction A.2 of Short Form N-2. The purpose of the table below is to help you understand all fees and expenses that you, as a common shareholder, would bear directly or indirectly. In accordance with SEC requirements, the table below shows the fund’s expenses as a percentage of its average net assets as of October 31, 2024, and not as a percentage of total assets. By showing expenses as a percentage of average net assets, expenses are not expressed as a percentage of all of the assets in which thefund invests. The offering costs to be paid or reimbursed by the fund are not included in the annual expenses table below. However, these expenses will be borne by common shareholders and may result in a reduction in the NAV of the common shares. The table and example are based on the fun d’s c apital structure as of October 31, 2024. |  |  |  |  |
Basis of Transaction Fees, Note [Text Block] |  |  |  |  |  |  |  |  |  | as a percentage of offering price |  |  |  |  |
Other Transaction Fees, Note [Text Block] |  |  |  |  |  |  |  |  |  | If common shares are sold to or through underwriters, the fund’s prospectus will set forth any applicable sales load and the estimated offering expenses. |  |  |  |  |
Management Fee not based on Net Assets, Note [Text Block] |  |  |  |  |  |  |  |  |  | See "Note 5 – Fees and transactions with affiliates.” |  |  |  |  |
Financial Highlights [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Securities [Table Text Block] |  |  |  |  |  |  |  |  |  |
Senior Securities |  |  |  |  |
Total debt outstanding end of period (in millions) | $ 384 | $ 384 | $ 384 | $ 384 | $ 384
Asset coverage per $1,000 of debt 7 | $ 2,992 | $ 2,811 | $ 3,009 | $ 3,035 | $ 2,909
Senior Securities Amount |  |  |  |  |  |  |  |  |  |  | $ 384,000,000 | $ 384,000,000 | $ 384,000,000 | $ 384,000,000 | $ 384,000,000
Senior Securities Coverage per Unit | [6] |  |  |  |  |  |  |  |  |  | $ 2,992 | $ 2,811 | $ 3,009 | $ 3,035 | $ 2,909
Senior Securities, Note [Text Block] |  |  |  |  |  |  |  |  |  | Additional Financial Highlights and Senior securities The following information is presented in conformance with annual reporting requirements for funds that have filed a registration statement pursuant to General Instruction A.2 of Form N-2 (“Short Form N-2”). The table below sets forth additional Financial Highlights and each class of senior securities outstanding of the fund for the years ended, as indicated below. Refer to the “Financial highlights” for the most recent five years of senior securities outstanding, which have been audited by PricewaterhouseCoopers LLP (“PwC”), the fund’s independent registered public accounting firm. The report of PwC is included within this report. |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Objectives and Practices [Text Block] |  |  |  |  |  |  |  |  |  | Investment Objective The Fund’s investment objective is to provide high current income, consistent with modest growth of capital. The Fund will pursue its objective by investing in a diversified portfolio comprised primarily of dividend paying preferred securities and common equity securities. Principal Investment Strategies Under normal circumstances, the Fund will invest at least 80% of its net assets (plus borrowings for investment purposes) in dividend-paying securities. This is a non-fundamental policy and may be changed by the Board of Trustees of the fund provided that shareholders are provided with at least 60 days prior written notice of any change as required by the rules under the 1940 Act. The Fund will focus on common stocks of those issuers which, in the opinion of the Advisor, have strong fundamental characteristics, large market capitalizations, favorable credit quality and current dividend yields generally higher than the currently available dividend yield quoted on the Standard & Poor’s 500 Index. The Advisor intends to manage the Fund’s portfolio to generate income qualifying for the dividends received deduction (the Dividends Received Deduction) allowed corporations under Section 243(a)(1) of the Internal Revenue Code of 1986, as amended (the Code). The Fund may invest in floating-rate, fixed-to-floating rate, and fixed-rate preferred securities and debt obligations rated investment grade (at least "BBB" by Standard & Poor’s or "Baa" by Moody’s) at the time of investment or that are preferred securities of issuers of investment grade senior debt, some of which may have speculative characteristics, or, if not rated, will be of comparable quality as determined by the Advisor. The Fund will invest in common stocks of issuers whose senior debt is rated investment grade or, in the case of issuers that have no rated senior debt outstanding, whose senior debt is considered by the Advisor to be of comparable quality. The Fund may invest in money market instruments, which include short-term U.S. Government securities, investment grade commercial paper (unsecured promissory notes issued by corporations to finance their short-term credit needs), certificates of deposit and bankers’ acceptances. The Fund may invest up to 10% of the value of its total assets in dividend-paying securities of registered investment companies that invest primarily in investment grade securities. The fund concentrates its investments in securities of issuers primarily engaged in the utilities industry. The Fund may also invest in derivatives such as futures contracts, options, interest rate swaps and reverse repurchase agreements. The Fund intends to use reverse repurchase agreements to obtain investment leverage either alone and/or in combination with other forms of investment leverage or for temporary purposes. The fund also utilizes a liquidity agreement to increase its assets available for investments and may seek to obtain additional income or portfolio leverage by making secured loans of its portfolio securities with a value of up to 33 1/3% of its total assets. The Fund may invest up to 20% of its net assets in restricted securities purchased in direct placements. The Advisor may also take into consideration env ironmen tal, social, and/or governance (ESG) factors, alongside other relevant factors, as part of its investment selection process. 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. |  |  |  |  |
Risk Factors [Table Text Block] |  |  |  |  |  |  |  |  |  | Principal Risks As is the case with all exchange-listed closed-end funds, shares of this fund may trade at a discount or a premium to the fund’s net asset value (NAV). An investment in the fund is subject to investment and market risks, including the possible loss of the entire principal invested. The fund’s main risks are listed below in alphabetical order, not in order of importance. Changing distribution level & return of capital risk. There is no guarantee prior distribution levels will be maintained, and distributions may include a substantial tax return of capital. A return of capital is the return of all or a portion of a shareholder’s investment in the fund, which may increase the potential tax gain or decrease the potential tax loss of a subsequent sale of shares of the fund. For the fiscal year ended October 31, 2024, the fund’s aggregate distributions included no tax return of capital. Concentration risk. Because the fund may focus on one or more industries or sectors of the economy, its performance depends in large part on the performance of those industries or sectors. As a result, the value of an investment may fluctuate more widely since it is more susceptible to market, economic, political, regulatory, and other conditions and risks affecting those industries or sectors than a fund that invests more broadly across industries and sectors. 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. 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. Equity securities risk. The price of equity securities may decline due to changes in a company’s financial condition or overall market conditions. 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. The manager may consider these ESG factors on all or a meaningful portion of the fund’s investments. In certain situations, the extent to which these ESG factors may be applied according to the manager’s integrated investment process may not include U.S. Treasuries, government securities, or other asset classes. ESG factors may include, but are not limited to, matters regarding board diversity, climate change policies, and supply chain and human rights policies. 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. Integration of ESG factors into the fund’s investment process may result in a manager making different investments for the fund than for a fund with a similar investment universe and/or investment style that does not incorporate such considerations in its investment strategy or processes, and the fund’s investment performance may be affected. Because ESG factors are one of many considerations for the fund, the manager may nonetheless include companies with low ESG characteristics or exclude companies with high ESG characteristics in the fund’s investments. 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 payment or repay all or any of the principal borrowed. Changes in a security’s credit qualify may adversely affect fund performance. Additionally, the value of inflation-indexed securities is subject to the effects of changes in market interest rates caused by factors other than inflation (“real interest rates”). Generally, when real interest rates rise, the value of inflation-indexed securities will fall and the fund’s value may decline as a result of this exposure to these securities. 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: futures contracts, options, interest rate swaps and reverse repurchase agreements. 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. An event of default or insolvency of the counterparty to a reverse repurchase agreement could result in delays or restrictions with respect to the fund’s ability to dispose of the underlying securities. In addition, a reverse repurchase agreement may be considered a form of leverage and may, therefore, increase fluctuations in the fund’s NAV. Illiquid and restricted securities risk. Illiquid and restricted securities may be difficult to value and may involve greater risks than liquid securities. Illiquidity may have an adverse impact on a particular security’s market price and the fund’s ability to sell the security. Investment company securities risk. Fund shareholders indirectly bear their proportionate share of the expenses of any investment company in which the fund invests. The total return on such investments will be reduced by the operating expenses and fees of such other investment companies, including advisory fees. Large company risk. Larger companies may grow more slowly than smaller companies or be slower to respond to business developments. Large-capitalization securities may underperform the market as a whole. Leveraging risk. Issuing preferred shares or using derivatives may result in a leveraged portfolio. Leveraging long exposures increases a fund’s losses when the value of its investments declines. Some derivatives have the potential for unlimited loss, regardless of the size of the initial investment. The fund also utilizes a Liquidity Agreement to increase its assets available for investment. See “Note 7 — Leverage risk” above. 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. Widespread selling of fixed-income securities during periods of reduced demand may adversely impact the price or salability of such securities. 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. Preferred and convertible securities risk. Preferred stock dividends are payable only if declared by the issuer’s board. Preferred stock may be subject to redemption provisions. The market values of convertible securities tend to fall as interest rates rise and rise as interest rates fall. Convertible preferred stock’s value can depend heavily upon the underlying common stock’s value. U.S. Government agency obligations risk. U.S. 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. |  |  |  |  |
Share Price [Table Text Block] |  |  |  |  |  |  |  |  |  | Market and Net Asset Value Information The following table, presented in conformance with annual reporting requirements for funds that have filed a registration statement pursuant to General Instruction A.2 of Short Form N-2, sets forth, for each of the periods indicated, the high and low closing market prices of the fund’s Common Shares on the NYSE, the high and low NAV per common share and the high and low premium/discount to NAV per common share. See Note 2, Investment Valuation and Fair Value Measurements in the Notes to Financial Statements for information as to how the Fund’s NAV is determined. The fund’s currently outstanding Common Shares are listed on the New York Stock Exchange (“NYSE”) under the symbol PDT and commenced trading on the NYSE in 1994. The fund’s common shares have traded both at a premium and at a discount to its net asset value (“NAV”). The fund cannot predict whether its shares will trade in the future at a premium or discount to NAV. The provisions of the 1940 Act generally require that the public offering price of common shares (less any underwriting commissions and discounts) must equal or exceed the NAV per share of a company’s common stock (calculated within 48 hours of pricing). The fund’s issuance of common shares may have an adverse effect on prices in the secondary market for common shares by increasing the number of common shares available, which may put downward pressure on the market price for common shares. Shares of common stock of closed-end investment companies frequently trade at a discount from NAV. See “Risk Factors—General Risks—Market Discount Risk” and “—Secondary Market for the Common Shares” in the within the fund’s prospectus. The following table sets forth for each of the periods indicated the high and low closing market prices for common shares on the NYSE, and the corresponding NAV per share and the premium or discount to NAV per share at which the fund’s common shares were trading as of such date. NAV is determined once daily as of the close of regular trading of the NYSE (typically 4:00 P.M., Eastern Time). See “Determination of Net Asset Value” within the fund’s prospectus for information as to the determination of the fund’s NAV.
| Market Price | NAV per Share on Date of Market Price High and Low | Premium/(Discount) on Date of Market Price High and Low
Fiscal Quarter Ended | High | Low | High | Low | High | Low
January 31, 2023 | 14.20 | 12.72 | 12.95 | 12.84 | 9.65% | -0.93%
April 30, 2023 | 13.39 | 11.81 | 13.69 | 11.31 | -2.19% | 4.42%
July 31, 2023 | 12.57 | 11.10 | 12.13 | 11.25 | 3.63% | -1.33%
October 31, 2023 | 11.14 | 8.97 | 11.94 | 10.41 | -6.70% | -13.83%
January 31, 2024 | 11.08 | 9.83 | 11.69 | 10.67 | -5.22% | -7.87%
April 30, 2024 | 11.84 | 10.71 | 12.08 | 11.51 | -1.99% | -6.95%
July 31, 2024 | 12.37 | 11.23 | 12.92 | 12.33 | -4.26% | -8.92%
October 31, 2024 | 13.54 | 11.87 | 13.83 | 12.61 | -2.10% | -5.87%
The last reported sale price, NAV per share and percentage discount to NAV per share of the common shares as of October 31, 2024 were $12.83, $13.59 and (5.59)%, respectively. As of October 31, 2024, the fund had 49,185,225 common shares outstanding and net assets of the fund were $668,480,701. The fund does not believe that there are any material unresolved written comments, received 180 days or more before October 31, 2024, from the Staff of the SEC regarding any of the fund’s periodic or current reports under the Securities Exchange Act or the 1940 Act, or its registration statement. |  |  |  |  |
Lowest Price or Bid |  | $ 11.87 | $ 11.23 | $ 10.71 | $ 9.83 | $ 8.97 | $ 11.1 | $ 11.81 | $ 12.72 |  |  |  |  |  |
Highest Price or Bid |  | 13.54 | 12.37 | 11.84 | 11.08 | 11.14 | 12.57 | 13.39 | 14.2 |  |  |  |  |  |
Lowest Price or Bid, NAV |  | 12.61 | 12.33 | 11.51 | 10.67 | 10.41 | 11.25 | 11.31 | 12.84 |  |  |  |  |  |
Highest Price or Bid, NAV |  | $ 13.83 | $ 12.92 | $ 12.08 | $ 11.69 | $ 11.94 | $ 12.13 | $ 13.69 | $ 12.95 |  |  |  |  |  |
Highest Price or Bid, Premium (Discount) to NAV [Percent] |  | (2.10%) | (4.26%) | (1.99%) | (5.22%) | (6.70%) | 3.63% | (2.19%) | 9.65% |  |  |  |  |  |
Lowest Price or Bid, Premium (Discount) to NAV [Percent] |  | (5.87%) | (8.92%) | (6.95%) | (7.87%) | (13.83%) | (1.33%) | 4.42% | (0.93%) |  |  |  |  |  |
Share Price |  | $ 12.83 |  |  |  |  |  |  |  | $ 12.83 |  |  |  |  |
NAV Per Share |  | $ 13.59 |  |  |  |  |  |  |  | $ 13.59 |  |  |  |  |
Latest Premium (Discount) to NAV [Percent] |  |  |  |  |  |  |  |  |  | (5.59%) |  |  |  |  |
Capital Stock, Long-Term Debt, and Other Securities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Security, Held [Shares] |  |  |  |  |  |  |  |  |  | 49,185,225 |  |  |  |  |
Changing Distribution Level And Return Of Capital Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk [Text Block] |  |  |  |  |  |  |  |  |  | Changing distribution level & return of capital risk. There is no guarantee prior distribution levels will be maintained, and distributions may include a substantial tax return of capital. A return of capital is the return of all or a portion of a shareholder’s investment in the fund, which may increase the potential tax gain or decrease the potential tax loss of a subsequent sale of shares of the fund. For the fiscal year ended October 31, 2024, the fund’s aggregate distributions included no tax return of capital. |  |  |  |  |
Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk [Text Block] |  |  |  |  |  |  |  |  |  | Concentration risk. Because the fund may focus on one or more industries or sectors of the economy, its performance depends in large part on the performance of those industries or sectors. As a result, the value of an investment may fluctuate more widely since it is more susceptible to market, economic, political, regulatory, and other conditions and risks affecting those industries or sectors than a fund that invests more broadly across industries and sectors. |  |  |  |  |
Credit And Counterparty Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk [Text Block] |  |  |  |  |  |  |  |  |  | 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. |  |  |  |  |
Economic And Market Events Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk [Text Block] |  |  |  |  |  |  |  |  |  | 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. |  |  |  |  |
Equity Securities Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk [Text Block] |  |  |  |  |  |  |  |  |  | Equity securities risk. The price of equity securities may decline due to changes in a company’s financial condition or overall market conditions. |  |  |  |  |
Esg Integration Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk [Text Block] |  |  |  |  |  |  |  |  |  | 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. The manager may consider these ESG factors on all or a meaningful portion of the fund’s investments. In certain situations, the extent to which these ESG factors may be applied according to the manager’s integrated investment process may not include U.S. Treasuries, government securities, or other asset classes. ESG factors may include, but are not limited to, matters regarding board diversity, climate change policies, and supply chain and human rights policies. 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. Integration of ESG factors into the fund’s investment process may result in a manager making different investments for the fund than for a fund with a similar investment universe and/or investment style that does not incorporate such considerations in its investment strategy or processes, and the fund’s investment performance may be affected. Because ESG factors are one of many considerations for the fund, the manager may nonetheless include companies with low ESG characteristics or exclude companies with high ESG characteristics in the fund’s investments. |  |  |  |  |
Fixed Income Securities Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk [Text Block] |  |  |  |  |  |  |  |  |  | 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 payment or repay all or any of the principal borrowed. Changes in a security’s credit qualify may adversely affect fund performance. Additionally, the value of inflation-indexed securities is subject to the effects of changes in market interest rates caused by factors other than inflation (“real interest rates”). Generally, when real interest rates rise, the value of inflation-indexed securities will fall and the fund’s value may decline as a result of this exposure to these securities. |  |  |  |  |
Hedging, Derivatives, And Other Strategic Transactions Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk [Text Block] |  |  |  |  |  |  |  |  |  | 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: futures contracts, options, interest rate swaps and reverse repurchase agreements. 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. An event of default or insolvency of the counterparty to a reverse repurchase agreement could result in delays or restrictions with respect to the fund’s ability to dispose of the underlying securities. In addition, a reverse repurchase agreement may be considered a form of leverage and may, therefore, increase fluctuations in the fund’s NAV. |  |  |  |  |
Illiquid And Restricted Securities Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk [Text Block] |  |  |  |  |  |  |  |  |  | Illiquid and restricted securities risk. Illiquid and restricted securities may be difficult to value and may involve greater risks than liquid securities. Illiquidity may have an adverse impact on a particular security’s market price and the fund’s ability to sell the security. |  |  |  |  |
Investment Company Securities Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk [Text Block] |  |  |  |  |  |  |  |  |  | Investment company securities risk. Fund shareholders indirectly bear their proportionate share of the expenses of any investment company in which the fund invests. The total return on such investments will be reduced by the operating expenses and fees of such other investment companies, including advisory fees. |  |  |  |  |
Large Company Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk [Text Block] |  |  |  |  |  |  |  |  |  | Large company risk. Larger companies may grow more slowly than smaller companies or be slower to respond to business developments. Large-capitalization securities may underperform the market as a whole. |  |  |  |  |
Leveraging Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk [Text Block] |  |  |  |  |  |  |  |  |  | Leveraging risk. Issuing preferred shares or using derivatives may result in a leveraged portfolio. Leveraging long exposures increases a fund’s losses when the value of its investments declines. Some derivatives have the potential for unlimited loss, regardless of the size of the initial investment. The fund also utilizes a Liquidity Agreement to increase its assets available for investment. See “Note 7 — Leverage risk” above. |  |  |  |  |
Liquidity Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk [Text Block] |  |  |  |  |  |  |  |  |  | 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. Widespread selling of fixed-income securities during periods of reduced demand may adversely impact the price or salability of such securities. |  |  |  |  |
Operational and Cybersecurity Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk [Text Block] |  |  |  |  |  |  |  |  |  | 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. |  |  |  |  |
Preferred And Convertible Securities Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk [Text Block] |  |  |  |  |  |  |  |  |  | Preferred and convertible securities risk. Preferred stock dividends are payable only if declared by the issuer’s board. Preferred stock may be subject to redemption provisions. The market values of convertible securities tend to fall as interest rates rise and rise as interest rates fall. Convertible preferred stock’s value can depend heavily upon the underlying common stock’s value. |  |  |  |  |
U.S. Government Agency Obligations Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk [Text Block] |  |  |  |  |  |  |  |  |  | U.S. Government agency obligations risk. U.S. 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. |  |  |  |  |
Common Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Annual Expenses [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of Transaction Fees, Note [Text Block] |  |  |  |  |  |  |  |  |  | Percentage of Net Assets Attributable to Common Shares |  |  |  |  |
[1] | If common shares are sold to or through underwriters, the fund’s prospectus will set forth any applicable sales load and the estimated offering expenses.
[2] | Participants in the fund’s dividend reinvestment plan do not pay brokerage charges with respect to common shares issued directly by the fund. However, whenever common shares are purchased or sold on the NYSE or otherwise on the open market, each participant will pay a pro rata portion of brokerage trading fees, currently $0.05 per share purchased or sold. Brokerage trading fees will be deducted from amounts to be invested. Shareholders participating in the Plan may buy additional common shares of the fund through the Plan at any time and will be charged a $5 transaction fee plus $0.05 per share brokerage trading fee for each order. See “Dividends and distributions” and “Dividend reinvestment plan”.
[3] | See "Note 5 – Fees and transactions with affiliates.”
[4] | The fund uses leverage by borrowing under a liquidity agreement. “Interest payments on borrowed funds” includes all interest paid in connection with outstanding loans. See “Note 8 - “Liquidity Agreement.”
[5] | The Advisor has contractually agreed to waive a portion of its management fee and/or reimburse expenses for certain funds of the John Hancock group of funds complex, including the fund (the participating portfolios). This waiver is based upon aggregate managed assets of all the participating portfolios. The amount of the reimbursement is calculated daily and allocated among all the participating portfolios in proportion to the daily net assets of each fund. During the year ended October 31, 2024, this waiver amounted to 0.01% of the fund’s average daily net assets. This agreement expires on July 31, 2026, 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.
[6] | Asset coverage equals the total net assets plus borrowings divided by the borrowings of the fund outstanding at period end (Note 8). As debt outstanding changes, the level of invested assets may change accordingly. Asset coverage ratio provides a measure of leverage.

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