| N-2 - USD ($) | 3 Months Ended | 12 Months Ended | ||||||||
| Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2024 | ||
| Cover [Abstract] | ||||||||||
| Entity Central Index Key | 0001385763 | |||||||||
| Amendment Flag | false | |||||||||
| Document Type | N-CSR | |||||||||
| Entity Registrant Name | Nuveen Core Equity Alpha Fund | |||||||||
| Fee Table [Abstract] | ||||||||||
| Shareholder Transaction Expenses [Table Text Block] | Shareholder Transaction Expenses SPXX QQQX JCE Maximum Sales Charge (as a percentage of offering price) (1) 1.00 1.00 1.00 Dividend Reinvestment Plan Fees (2) $ 2.50 $ 2.50 $ 2.50 (1) The maximum sales charge for offerings made at-the-market at-the-market, (2) You will be charged a $2.50 service charge and pay brokerage charges if you direct Computershare Inc. and Computershare Trust Company, N.A., as agent for the common shareholders, to sell your Common Shares held in a dividend reinvestment account. | |||||||||
| Sales Load [Percent] | [1] | 1% | ||||||||
| Dividend Reinvestment and Cash Purchase Fees | [2] | $ 2.5 | ||||||||
| Other Transaction Expenses [Abstract] | ||||||||||
| Annual Expenses [Table Text Block] | Annual Expenses (As a Percentage of Net Assets Attributable to Common Shares) (1) SPXX QQQX JCE Management Fees 0.82% 0.83% 0.91% Other Expenses (2) 0.09% 0.07% 0.09% Total Annual Expenses 0.91% 0.90% 1.00% (1) Stated as percentages of average net assets attributable to Common Shares for the fiscal year ended December 31, 2024. (2) Other Expenses are based on estimated amounts for the current fiscal year. Expenses attributable to the Fund’s investments, if any, in other investment companies are currently estimated not to exceed 0.01%. | |||||||||
| Management Fees [Percent] | [3] | 0.91% | ||||||||
| Other Annual Expenses [Abstract] | ||||||||||
| Other Annual Expenses [Percent] | [3],[4] | 0.09% | ||||||||
| Total Annual Expenses [Percent] | [3] | 1% | ||||||||
| Expense Example [Table Text Block] | Example The following example illustrates the expenses, including the applicable transaction fees (referred to as the “Maximum Sales Charge” in the Shareholder Transaction Expenses table above), if any, that a common shareholder would pay on a $1,000 investment that is held for the time periods provided in the table. The example assumes that all dividends and other distributions are reinvested in the Fund and that the Fund’s Annual Expenses, as provided above, remain the same. The example also assumes a 5% annual return. Actual expenses may be greater or less than those assumed. Moreover, the Fund’s actual rate of return may be greater or less than the hypothetical 5% return shown in the example. Example (At-the-Market The following example assumes a transaction fee of 1.00%, as a percentage of the offering price. 1 Year 3 Years 5 Years 10 Years SPXX $19 $39 $60 $121 QQQX $19 $38 $59 $120 JCE $20 $42 $65 $131 | |||||||||
| Expense Example, Year 01 | $ 20 | |||||||||
| Expense Example, Years 1 to 3 | 42 | |||||||||
| Expense Example, Years 1 to 5 | 65 | |||||||||
| Expense Example, Years 1 to 10 | $ 131 | |||||||||
| Purpose of Fee Table , Note [Text Block] | The purpose of the tables and the example below are to help you understand all fees and expenses that you, as a common shareholder, would bear directly or indirectly. The tables show the expenses of each Fund as a percentage of the average net assets applicable to Common Shares and not as a percentage of total assets or managed assets. | |||||||||
| Basis of Transaction Fees, Note [Text Block] | as a percentage of offering price | |||||||||
| Other Expenses, Note [Text Block] | Other Expenses are based on estimated amounts for the current fiscal year. Expenses attributable to the Fund’s investments, if any, in other investment companies are currently estimated not to exceed 0.01%. | |||||||||
| General Description of Registrant [Abstract] | ||||||||||
| Investment Objectives and Practices [Text Block] | Investment Objective The Fund’s investment objective is to provide an attractive level of total return. The Fund seeks to achieve its investment objective primarily through long term capital appreciation and secondarily through income and gains. Investment Policies Under normal circumstances, the Fund will invest at least 80% of its Assets (as defined below) in the Equity Portfolio (as defined below). The Fund invests in a portfolio of actively managed large capitalization United States (“U.S.”) common stocks, using the sub-adviser’s “Assets” means net assets of the Fund plus the amount of any borrowings for investment purposes. “Managed Assets” mean the total assets of the Fund, minus the sum of its accrued liabilities (other than Fund liabilities incurred for the express purpose of creating leverage). Total assets for this purpose shall include assets attributable to the Fund’s use of leverage (whether or not those assets are reflected in the Fund’s financial statements for purposes of generally accepted accounting principles), and derivatives will be valued at their market value. Under normal market conditions: · The notional value of the call options written by the Fund under its Options Strategy may be up to 50% of the value of the Fund’s Managed Assets. · The Fund intends to limit the overlap between the stocks held in the Equity Portfolio and the stocks underlying the Fund’s call options to less than 70% (generally based on the value of such components). · The Fund may invest up to 10% of is Managed Assets in securities of other open- or closed-end The foregoing policies apply only at the time of any new investment. Approving Changes in Investment Policies The Board of Trustees of the Fund may change the policies described above without a shareholder vote. However, with respect to the Fund’s policy of investing at least 80% of its Assets in the Equity Portfolio, such policy may not be changed without 60 days’ prior written notice to shareholders. Portfolio Contents The Fund generally invests in a portfolio of common stocks. Common stock generally represents an equity ownership interest in an issuer, without preference over and with a lower priority than any other class of securities, including such issuer’s debt securities, preferred stock and other senior equity securities. Common stocks usually carry voting rights and earn dividends. Common stocks fluctuate in price in response to many factors including historical and prospective earnings of the issuer, the value of its assets, general economic conditions, interest rates, investor perceptions and market liquidity, as such the company may or may not pay dividends. Dividends on common stocks are declared at the discretion of the company’s board. In addition, common stock generally has the greatest appreciation and depreciation potential because increases and decreases in earnings are usually reflected in a company’s stock price. The Fund implements its Option Strategy by writing (selling) index call options and call options on custom baskets of securities. An option contract is a contract that gives the holder of the option, in return for a premium, the right to buy from (in the case of a call) or sell to (in the case of a put) the writer of the option the reference instrument underlying the option (or the cash value of the index) at a specified exercise price at any time during the term of the option. The writer of an option on a security has the obligation upon exercise of the option to deliver the reference instrument (or the cash) upon payment of the exercise price or to pay the exercise price upon delivery of the reference instrument (or the cash). Upon exercise of an index option, the writer of an option on an index is obligated to pay the difference between the cash value of the index and the exercise price multiplied by the specified multiplier for the index option. Options may be “covered,” meaning that the party required to deliver the reference instrument if the option is exercised owns that instrument (or has set aside sufficient assets to meet its obligation to deliver the instrument). Options may be listed on an exchange or traded in the over-the-counter The Fund writes index call options on broad-based indices and may, if the sub-adviser The Fund may also write call options on custom baskets of securities. A custom basket call option is an OTC option with a counterparty whose value is linked to the market value of a portfolio of underlying securities and is collateralized by a portion of the Fund’s Equity Portfolio. In order to minimize the difference between the returns of the underlying securities in the custom basket (commonly referred to as a tracking error), the sub-adviser In addition to the use of call options as described above, the Fund may enter into certain derivative instruments in pursuit of its investment objective, including to seek to enhance return, to hedge certain risks of its investments or as a substitute for a position in the underlying asset. Such instruments include options, futures contracts, index futures and total return swaps. In addition, the Fund may invest in other types of derivative instruments that are currently non-principal The Fund may enter into repurchase agreements (the purchase of a security coupled with an agreement to resell that security at a higher price) with respect to its permitted investments. The Fund’s repurchase agreements will provide that the value of the collateral underlying the repurchase agreement will always be at least equal to the repurchase price, including any accrued interest earned on the agreement, and will be marked-to-market The Fund may invest in illiquid securities (i.e., securities that are not readily marketable), including, but not limited to, restricted securities (securities the disposition of which is restricted under the federal securities laws), securities that may be resold only pursuant to Rule 144A under the Securities Act of 1933, as amended (the “1933 Act”), and repurchase agreements with maturities in excess of seven days. The Fund may buy and sell securities on a when-issued or delayed delivery basis, making payment or taking delivery at a later date, normally within 15 to 45 days of the trade date. The Fund may lend securities representing up to one-third Use of Leverage As a non-fundamental Temporary Defensive Periods During temporary defensive periods the Fund may deviate from its investment objective and policies, and in order to keep the Fund’s cash fully invested, the Fund may invest up to 100% of its Managed Assets in investment grade debt securities, including obligations issued or guaranteed by the U.S. government, its agencies and instrumentalities. The Fund may not achieve its investment objective during such periods. | |||||||||
| Risk Factors [Table Text Block] | PRINCIPAL RISKS OF THE FUNDS The factors that are most likely to have a material effect on a particular Fund’s portfolio as a whole are called “principal risks.” Each Fund is subject to the principal risks indicated below, whether through direct investment or derivative positions. Each Fund may be subject to additional risks other than those identified and described below because the types of investments made by a Fund can change over time. Risk BXMX DIAX SPXX QQQX JCE Portfolio Level Risks Call Option Risk X X X X X Call Spreads Risk X X X X - Common Stock Risk X X X X X Concentration Risk X X X X - Counterparty Risk X X X X X Deflation Risk X X X X X Derivatives Risk X X X X X Dividend Income Risk X X X X X Frequent Trading Risk - - - - X Financial Services Sector Risk - X X - - Hedging Risk X X X X X Illiquid Investments Risk X X X X X Inflation Risk X X X X X Information Technology Sector Risk X - X - - Large-Cap X X X X X Non-U.S. X X X X - Options Strategy Risk X X X X X Other Investment Companies Risk X X X X X Put Option Risk X X X X - Quantitative Analysis Risk - - - - X Swap Transactions Risk X X X X X Valuation Risk X X X X X When-Issued and Delayed-Delivery Transactions Risk X X X X X Risk BXMX DIAX SPXX QQQX JCE Fund Level and Other Risks Anti-Takeover Provisions X X X X X Borrowing Risk X X X X X Cybersecurity Risk X X X X X Global Economic Risk X X X X X Investment and Market Risk X X X X X Legislation and Regulatory Risk X X X X X Market Discount from Net Asset Value X X X X X Non-Diversified - X - X - Not an Index Fund X X X X - Recent Market Conditions X X X X X Fund Tax Risk X X X X X Shareholder Update (continued) Portfolio Level Risks: Call Option Risk . In addition, because the exercise of index options is settled in cash, sellers of index call options, such as the Fund, cannot provide in advance for their potential settlement obligations by acquiring and holding the underlying securities. The Fund bears a risk that the value of the securities held by the Fund will vary from the value of the underlying index and relative to the written index call option positions. Accordingly, the Fund may incur losses on the index call options that it has sold that exceed gains on the Fund’s equity portfolio. The value of index options written by the Fund, which will be priced daily, will be affected by changes in the value of and dividend rates of the underlying common stocks in the index, changes in the actual or perceived volatility of the stock market and the remaining time to the options’ expiration. The value of the index options also may be adversely affected if the market for the index options becomes less liquid or smaller. Call Spreads Risk . sub-adviser. Common Stock Risk. Concentration Risk. Counterparty Risk. sub-adviser Deflation Risk. Derivatives Risk. over-the-counter It is possible that regulatory or other developments in the derivatives market, including changes in government regulation could adversely impact the Fund’s ability to invest in certain derivatives successfully use derivative instruments. Dividend Income Risk . Frequent Trading Risk . mark-ups Hedging Risk . sub-adviser’s sub-adviser’s Illiquid Investments Risk. Inflation Risk. Information Technology Sector Risk. Large-Cap large-cap mid-and small-cap Non-U.S. non-U.S. non-U.S. non-U.S. non-U.S. non-U.S. non-U.S. Options Strategy Risk. sub-adviser Other Investment Companies Risk . With respect to ETF’s, an ETF that is based on a specific index may not be able to replicate and maintain exactly the composition and relative weighting of securities in the index. The value of an ETF based on a specific index is subject to change as the values of its respective component assets fluctuate according to market volatility. ETFs typically rely on a limited pool of authorized participants to create and redeem shares, and an active trading market for ETF shares may not develop or be maintained. The market value of shares of ETFs and closed-end Put Option Risk . Quantitative Analysis Risk . Swap Transactions Risk. sub-adviser sub-adviser U.S. Government Securities Risk . Valuation Risk . When-Issued and Delayed-Delivery Transaction Risk . Fund Level and Other Risks: Anti-Takeover Provisions . by-laws open-end Borrowing Risk . Cybersecurity Risk . Global Economic Risk . COVID-19 sub-adviser, The Fund does not know and cannot predict how long the securities markets may be affected by these events and the future impact of these and similar events on the global economy and securities markets is uncertain. The Fund may be adversely affected by abrogation of international agreements and national laws which have created the market instruments in which the Fund may invest, failure of the designated national and international authorities to enforce compliance with the same laws and agreements, failure of local, national and international organizations to carry out the duties prescribed to them under the relevant agreements, revisions of these laws and agreements which dilute their effectiveness or conflicting interpretation of provisions of the same laws and agreements. Governmental and quasi-governmental authorities and regulators throughout the world have in the past responded to major economic disruptions with a variety of significant fiscal and monetary policy changes, including but not limited to, direct capital infusions into companies, new monetary programs and dramatically lower interest rates. An unexpected or quick reversal of these policies, or the ineffectiveness of these policies, could increase volatility in securities markets, which could adversely affect the Fund’s investments. Investment and Market Risk . Legislation and Regulatory Risk . slatio Market Discount from Net Asset Value . closed-end closed-end Non-Diversified . “non-diversified” Not an Index Fund . Recent Market Conditions . add to instability in the world economy and markets generally. As a result of increasingly interconnected global economies and financial markets, the value and liquidity of the Fund’s investments may be negatively affected by events impacting a country or region, regardless of whether the Fund invests in issuers located in or with significant exposure to such country or region. Ukraine has experienced ongoing military conflict, most recently in February 2022 when Russia invaded Ukraine; this conflict may expand and military attacks could occur elsewhere in Europe. Europe has also been struggling with mass migration from the Middle East and Africa. The ultimate effects of these events and other socio-political or geographical issues are not known but could profoundly affect global economies and markets. Additionally, in October 2023 armed conflict broke out between Israel and the militant group Hamas after Hamas infiltrated Israel’s southern border from the Gaza Strip. Israel has since declared war against Hamas and it’s possible that this conflict could escalate into a greater regional conflict. The ultimate effects of these events and other socio-political or geographical issues are not known but could profoundly affect global economies and markets. Additionally, in October 2023 armed conflict broke out between Isreal and the militant group Hamas after Hamas infiltrated Isreal’s southern border from the Gaza Strip. Isreal has since declared war against Hamas and it’s possible that this conflict could escalate into a greater regional conflict. The ultimate effects of these events and other socio-political or geographical issues are not known but could profoundly affect global economies and markets. The ongoing trade war between China and the United States, including the imposition of tariffs by each country on the other country’s products, has created a tense political environment. These actions may trigger a significant reduction in international trade, the oversupply of certain manufactured goods, substantial price reductions of goods and possible failure of individual companies and/or large segments of China’s export industry, which could have a negative impact on the Fund’s performance. U.S. companies that source material and goods from China and those that make large amounts of sales in China would be particularly vulnerable to an escalation of trade tensions. Uncertainty regarding the outcome of the trade tensions and the potential for a trade war could cause the U.S. dollar to decline against safe haven currencies, such as the Japanese yen and the euro. Events such as these and their consequences are difficult to predict and it is unclear whether further tariffs may be imposed or other escalating actions may be taken in the future. The U.S. Federal Reserve (the “Fed”) has in the past sharply raised interest rates, and while the Fed has recently lowered the federal funds rate, it has signaled an intention to maintain relatively higher interest rates until current inflation levels re-align The impact of these developments in the near- and long-term is unknown and could have additional adverse effects on economies, financial markets and asset valuations around the world. Fund Tax Risk . amended | |||||||||
| Effects of Leverage [Text Block] | Use of Leverage As a non-fundamental | |||||||||
| Share Price [Table Text Block] | TRADING AND NET ASSET VALUE INFORMATION The following table shows for the periods indicated: (i) the high and low sales prices for the Common Shares of Nuveen S&P 500 Dynamic Overwrite Fund (SPXX) and Nuveen Core Equity Alpha Fund (JCE) reported as of the end of the day on the New York Stock Exchange (NYSE) and Nuveen Nasdaq 100 Dynamic Overwrite Fund (QQQX) reported as of the end of the day on the Nasdaq Stock Market LLC (Nasdaq), (ii) the corresponding NAV per share, and (iii) the premium/(discount) to NAV per share at which the Common Shares were trading as of such date. JCE Closing Market Price per NAV per Common Share on Date Premium/(Discount) on Date of Fiscal Quarter End High Low High Low High Low December 2024 $16.14 $14.94 $16.27 $15.22 (0.80)% (1.84)% September 2024 $15.37 $13.96 $15.21 $13.97 1.05% (0.07)% June 2024 $15.00 $13.33 $14.71 $13.72 1.97% (2.84)% March 2024 $14.27 $12.94 $14.39 $13.34 (0.83)% (3.00)% December 2023 $14.02 $11.65 $13.49 $12.01 3.93% (3.00)% September 2023 $13.16 $12.12 $13.44 $12.40 (2.08)% (2.26)% June 2023 $12.90 $11.82 $13.10 $12.44 (1.53)% (4.98)% March 2023 $13.54 $11.82 $12.04 $12.16 12.46% (2.80)% The following table shows, as of December 31, 2024 each Fund’s: (i) NAV per Common Share, (ii) market price, (iii) percentage of premium/(discount) to NAV per Common Share and, (iv) net assets attributable to Common Shares. December 31, 2024 SPXX QQQX JCE NAV per Common Share $ 18.44 $ 29.41 $ 15.48 Market Price $ 17.75 $ 27.05 $ 15.90 Percentage of Premium/(Discount) to NAV per Common Share (3.74)% (8.02)% 2.71% Net Assets Attributable to Common Shares $ 331,172,634 $ 1,436,048,875 $ 258,622,195 Shares of closed-end open-end | |||||||||
| Call Option Risk [Member] | ||||||||||
| General Description of Registrant [Abstract] | ||||||||||
| Risk [Text Block] | Call Option Risk . In addition, because the exercise of index options is settled in cash, sellers of index call options, such as the Fund, cannot provide in advance for their potential settlement obligations by acquiring and holding the underlying securities. The Fund bears a risk that the value of the securities held by the Fund will vary from the value of the underlying index and relative to the written index call option positions. Accordingly, the Fund may incur losses on the index call options that it has sold that exceed gains on the Fund’s equity portfolio. The value of index options written by the Fund, which will be priced daily, will be affected by changes in the value of and dividend rates of the underlying common stocks in the index, changes in the actual or perceived volatility of the stock market and the remaining time to the options’ expiration. The value of the index options also may be adversely affected if the market for the index options becomes less liquid or smaller. | |||||||||
| Common Stock Risk [Member] | ||||||||||
| General Description of Registrant [Abstract] | ||||||||||
| Risk [Text Block] | Common Stock Risk. | |||||||||
| Counterparty Risk [Member] | ||||||||||
| General Description of Registrant [Abstract] | ||||||||||
| Risk [Text Block] | Counterparty Risk. sub-adviser | |||||||||
| Deflation Risk [Member] | ||||||||||
| General Description of Registrant [Abstract] | ||||||||||
| Risk [Text Block] | Deflation Risk. | |||||||||
| Derivatives Risk [Member] | ||||||||||
| General Description of Registrant [Abstract] | ||||||||||
| Risk [Text Block] | Derivatives Risk. over-the-counter It is possible that regulatory or other developments in the derivatives market, including changes in government regulation could adversely impact the Fund’s ability to invest in certain derivatives successfully use derivative instruments. | |||||||||
| Dividend Income Risk [Member] | ||||||||||
| General Description of Registrant [Abstract] | ||||||||||
| Risk [Text Block] | Dividend Income Risk . | |||||||||
| Frequent Trading Risk [Member] | ||||||||||
| General Description of Registrant [Abstract] | ||||||||||
| Risk [Text Block] | Frequent Trading Risk . mark-ups | |||||||||
| Hedging Risk [Member] | ||||||||||
| General Description of Registrant [Abstract] | ||||||||||
| Risk [Text Block] | Hedging Risk . sub-adviser’s sub-adviser’s | |||||||||
| Illiquid Investments Risk [Member] | ||||||||||
| General Description of Registrant [Abstract] | ||||||||||
| Risk [Text Block] | Illiquid Investments Risk. | |||||||||
| Inflation Risk [Member] | ||||||||||
| General Description of Registrant [Abstract] | ||||||||||
| Risk [Text Block] | Inflation Risk. | |||||||||
| Large Cap Company Risk [Member] | ||||||||||
| General Description of Registrant [Abstract] | ||||||||||
| Risk [Text Block] | Large-Cap large-cap mid-and small-cap | |||||||||
| Options Strategy Risk [Member] | ||||||||||
| General Description of Registrant [Abstract] | ||||||||||
| Risk [Text Block] | Options Strategy Risk. sub-adviser | |||||||||
| Other Investment Companies Risk [Member] | ||||||||||
| General Description of Registrant [Abstract] | ||||||||||
| Risk [Text Block] | Other Investment Companies Risk . With respect to ETF’s, an ETF that is based on a specific index may not be able to replicate and maintain exactly the composition and relative weighting of securities in the index. The value of an ETF based on a specific index is subject to change as the values of its respective component assets fluctuate according to market volatility. ETFs typically rely on a limited pool of authorized participants to create and redeem shares, and an active trading market for ETF shares may not develop or be maintained. The market value of shares of ETFs and closed-end | |||||||||
| Quantitative Analysis Risk [Member] | ||||||||||
| General Description of Registrant [Abstract] | ||||||||||
| Risk [Text Block] | Quantitative Analysis Risk . | |||||||||
| Swap Transactions Risk [Member] | ||||||||||
| General Description of Registrant [Abstract] | ||||||||||
| Risk [Text Block] | Swap Transactions Risk. sub-adviser sub-adviser | |||||||||
| Valuation Risk [Member] | ||||||||||
| General Description of Registrant [Abstract] | ||||||||||
| Risk [Text Block] | Valuation Risk . | |||||||||
| When Issued and Delayed Delivery Transaction Risk [Member] | ||||||||||
| General Description of Registrant [Abstract] | ||||||||||
| Risk [Text Block] | When-Issued and Delayed-Delivery Transaction Risk . | |||||||||
| Anti Takeover Provisions [Member] | ||||||||||
| General Description of Registrant [Abstract] | ||||||||||
| Risk [Text Block] | Anti-Takeover Provisions . by-laws open-end | |||||||||
| Borrowing Risk [Member] | ||||||||||
| General Description of Registrant [Abstract] | ||||||||||
| Risk [Text Block] | Borrowing Risk . | |||||||||
| Cybersecurity Risk [Member] | ||||||||||
| General Description of Registrant [Abstract] | ||||||||||
| Risk [Text Block] | Cybersecurity Risk . | |||||||||
| Global Economic Risk [Member] | ||||||||||
| General Description of Registrant [Abstract] | ||||||||||
| Risk [Text Block] | Global Economic Risk . COVID-19 sub-adviser, The Fund does not know and cannot predict how long the securities markets may be affected by these events and the future impact of these and similar events on the global economy and securities markets is uncertain. The Fund may be adversely affected by abrogation of international agreements and national laws which have created the market instruments in which the Fund may invest, failure of the designated national and international authorities to enforce compliance with the same laws and agreements, failure of local, national and international organizations to carry out the duties prescribed to them under the relevant agreements, revisions of these laws and agreements which dilute their effectiveness or conflicting interpretation of provisions of the same laws and agreements. Governmental and quasi-governmental authorities and regulators throughout the world have in the past responded to major economic disruptions with a variety of significant fiscal and monetary policy changes, including but not limited to, direct capital infusions into companies, new monetary programs and dramatically lower interest rates. An unexpected or quick reversal of these policies, or the ineffectiveness of these policies, could increase volatility in securities markets, which could adversely affect the Fund’s investments. | |||||||||
| Investment and Market Risk [Member] | ||||||||||
| General Description of Registrant [Abstract] | ||||||||||
| Risk [Text Block] | Investment and Market Risk . | |||||||||
| Legislation and Regulatory Risk [Member] | ||||||||||
| General Description of Registrant [Abstract] | ||||||||||
| Risk [Text Block] | Legislation and Regulatory Risk . slatio | |||||||||
| Market Discount from Net Asset Value [Member] | ||||||||||
| General Description of Registrant [Abstract] | ||||||||||
| Risk [Text Block] | Market Discount from Net Asset Value . closed-end closed-end | |||||||||
| Recent Market Conditions [Member] | ||||||||||
| General Description of Registrant [Abstract] | ||||||||||
| Risk [Text Block] | Recent Market Conditions . add to instability in the world economy and markets generally. As a result of increasingly interconnected global economies and financial markets, the value and liquidity of the Fund’s investments may be negatively affected by events impacting a country or region, regardless of whether the Fund invests in issuers located in or with significant exposure to such country or region. Ukraine has experienced ongoing military conflict, most recently in February 2022 when Russia invaded Ukraine; this conflict may expand and military attacks could occur elsewhere in Europe. Europe has also been struggling with mass migration from the Middle East and Africa. The ultimate effects of these events and other socio-political or geographical issues are not known but could profoundly affect global economies and markets. Additionally, in October 2023 armed conflict broke out between Israel and the militant group Hamas after Hamas infiltrated Israel’s southern border from the Gaza Strip. Israel has since declared war against Hamas and it’s possible that this conflict could escalate into a greater regional conflict. The ultimate effects of these events and other socio-political or geographical issues are not known but could profoundly affect global economies and markets. Additionally, in October 2023 armed conflict broke out between Isreal and the militant group Hamas after Hamas infiltrated Isreal’s southern border from the Gaza Strip. Isreal has since declared war against Hamas and it’s possible that this conflict could escalate into a greater regional conflict. The ultimate effects of these events and other socio-political or geographical issues are not known but could profoundly affect global economies and markets. The ongoing trade war between China and the United States, including the imposition of tariffs by each country on the other country’s products, has created a tense political environment. These actions may trigger a significant reduction in international trade, the oversupply of certain manufactured goods, substantial price reductions of goods and possible failure of individual companies and/or large segments of China’s export industry, which could have a negative impact on the Fund’s performance. U.S. companies that source material and goods from China and those that make large amounts of sales in China would be particularly vulnerable to an escalation of trade tensions. Uncertainty regarding the outcome of the trade tensions and the potential for a trade war could cause the U.S. dollar to decline against safe haven currencies, such as the Japanese yen and the euro. Events such as these and their consequences are difficult to predict and it is unclear whether further tariffs may be imposed or other escalating actions may be taken in the future. The U.S. Federal Reserve (the “Fed”) has in the past sharply raised interest rates, and while the Fed has recently lowered the federal funds rate, it has signaled an intention to maintain relatively higher interest rates until current inflation levels re-align The impact of these developments in the near- and long-term is unknown and could have additional adverse effects on economies, financial markets and asset valuations around the world. | |||||||||
| Fund Tax Risk [Member] | ||||||||||
| General Description of Registrant [Abstract] | ||||||||||
| Risk [Text Block] | Fund Tax Risk . amended | |||||||||
| Common Shares [Member] | ||||||||||
| Other Annual Expenses [Abstract] | ||||||||||
| Basis of Transaction Fees, Note [Text Block] | As a Percentage of Net Assets Attributable to Common Shares | |||||||||
| General Description of Registrant [Abstract] | ||||||||||
| Lowest Price or Bid | $ 14.94 | $ 13.96 | $ 13.33 | $ 12.94 | $ 11.65 | $ 12.12 | $ 11.82 | $ 11.82 | ||
| Highest Price or Bid | 16.14 | 15.37 | 15 | 14.27 | 14.02 | 13.16 | 12.9 | 13.54 | ||
| Lowest Price or Bid, NAV | 15.22 | 13.97 | 13.72 | 13.34 | 12.01 | 12.4 | 12.44 | 12.16 | ||
| Highest Price or Bid, NAV | $ 16.27 | $ 15.21 | $ 14.71 | $ 14.39 | $ 13.49 | $ 13.44 | $ 13.1 | $ 12.04 | ||
| Highest Price or Bid, Premium (Discount) to NAV [Percent] | (0.80%) | 1.05% | 1.97% | (0.83%) | 3.93% | (2.08%) | (1.53%) | 12.46% | ||
| Lowest Price or Bid, Premium (Discount) to NAV [Percent] | (1.84%) | (0.07%) | (2.84%) | (3.00%) | (3.00%) | (2.26%) | (4.98%) | (2.80%) | ||
| Share Price | $ 15.9 | $ 15.9 | ||||||||
| NAV Per Share | $ 15.48 | $ 15.48 | ||||||||
| Latest Premium (Discount) to NAV [Percent] | 2.71% | |||||||||
| Capital Stock, Long-Term Debt, and Other Securities [Abstract] | ||||||||||
| Outstanding Security, Title [Text Block] | Common shares | |||||||||
| Outstanding Security, Held [Shares] | 16,709,522 | |||||||||
| [1]A maximum sales charge of 4.00% applies only to offerings pursuant to a syndicated underwriting. The maximum sales charge for offerings made at-the-market is 1.00%. There is no sales charge for offerings pursuant to a private transaction.[2]You will be charged a $2.50 service charge and pay brokerage charges if you direct Computershare Inc. and Computershare Trust Company, N.A., as agent for the common shareholders, to sell your Common Shares held in a dividend reinvestment account.[3]Stated as percentages of average net assets attributable to Common Shares for the fiscal year ended December 31, 2024.[4]Other Expenses are based on estimated amounts for the current fiscal year. Expenses attributable to the Fund’s investments, if any, in other investment companies are currently estimated not to exceed 0.01%. | ||||||||||
