| N-2 | 6 Months Ended |
| Aug. 31, 2023 | |
| Cover [Abstract] | |
| Entity Central Index Key | 0001698508 |
| Amendment Flag | false |
| Document Type | N-CSRS |
| Entity Registrant Name | Invesco High Income 2024 Target Term Fund |
| General Description of Registrant [Abstract] | |
| Investment Objectives and Practices [Text Block] | The Fund’s investment objectives are to provide a high level of current income and to return $9.835 per share (the original net asset value (the “NAV”) per common share before deducting offering costs of $0.02 per share) (“Original NAV”) to common shareholders on or about December 1, 2024 (the “Termination Date”). |
| Risk Factors [Table Text Block] | L. LIBOR Transition Risk – There remains uncertainty and risks relating to the continuing LIBOR transition and its effects on the Fund and the instruments in which the Fund invests. There can be no assurance that the composition or characteristics of any alternative reference rates (“ARRs”) or financial instruments in which the Fund invests that utilize ARRs will be similar to or produce the same value or economic equivalence as LIBOR or that these instruments will have the same volume or liquidity. Additionally, there remains uncertainty and risks relating to certain “legacy” USD LIBOR instruments that were issued or entered into before December 31, 2021 and the process by which a replacement interest rate will be identified and implemented into these instruments when USD LIBOR is ultimately discontinued. On December 16, 2022, the Federal Reserve Board adopted regulations implementing the Adjustable Interest Rate Act. The regulations provide a statutory fallback mechanism to replace LIBOR, by identifying benchmark rates based on the Secured Overnight Financing Rate (“SOFR”) that replaced LIBOR in certain financial contracts after June 30, 2023. These regulations apply only to contracts governed by U.S. law, among other limitations. The Funds may have instruments linked to other interbank offered rates that may also cease to be published in the future. The effects of such uncertainty and risks in “legacy” USD LIBOR instruments held by the Fund could result in losses to the Fund. M. Leverage Risk N. Collateral O. Other Risks Mortgage- and asset-backed securities, including collateralized debt obligations and collateralized mortgage obligations, are subject to prepayment or call risk, which is the risk that a borrower’s payments may be received earlier or later than expected due to changes in prepayment rates on underlying loans. This could result in the Fund reinvesting these early payments at lower interest rates, thereby reducing the Fund’s income. Mortgage- and asset-backed securities also are subject to extension risk, which is the risk that an unexpected rise in interest rates could reduce the rate of prepayments, causing the price of the mortgage- and asset-backed securities and the Fund’s share price to fall. An unexpectedly high rate of defaults on the mortgages held by a mortgage pool may adversely affect the value of mortgage-backed securities and could result in losses to the Fund. Privately-issued mortgage-backed securities and asset-backed securities may be less liquid than other types of securities and the Fund may be unable to sell these securities at the time or price it desires. Increases in the federal funds and equivalent foreign rates or other changes to monetary policy or regulatory actions may expose fixed income markets to heightened volatility and reduced liquidity for certain fixed income investments, particularly those with longer maturities. It is difficult to predict the impact of interest rate changes on various markets. In addition, decreases in fixed income dealer market-making capacity may also potentially lead to heightened volatility and reduced liquidity in the fixed income markets. As a result, the value of the Fund’s investments and share price may decline. Changes in central bank policies could also result in higher than normal redemptions by shareholders, which could potentially increase the Fund’s portfolio turnover rate and transaction costs. Policy changes by the U.S. government or its regulatory agencies and political events within the U.S. and abroad may, among other things, affect investor and consumer confidence and increase volatility in the financial markets, perhaps suddenly and to a significant degree, which may adversely impact the Fund’s operations, universe of potential investment options, and return potential. Preferred securities are subject to issuer-specific and market risks applicable generally to equity securities. Preferred securities also may be subordinated to bonds or other debt instruments, subjecting them to a greater risk of non‑payment, may be less liquid than many other securities, such as common stocks, and generally offer no voting rights with respect to the issuer. |
| LIBOR Transition Risk [Member] | |
| General Description of Registrant [Abstract] | |
| Risk [Text Block] | L. LIBOR Transition Risk – There remains uncertainty and risks relating to the continuing LIBOR transition and its effects on the Fund and the instruments in which the Fund invests. There can be no assurance that the composition or characteristics of any alternative reference rates (“ARRs”) or financial instruments in which the Fund invests that utilize ARRs will be similar to or produce the same value or economic equivalence as LIBOR or that these instruments will have the same volume or liquidity. Additionally, there remains uncertainty and risks relating to certain “legacy” USD LIBOR instruments that were issued or entered into before December 31, 2021 and the process by which a replacement interest rate will be identified and implemented into these instruments when USD LIBOR is ultimately discontinued. On December 16, 2022, the Federal Reserve Board adopted regulations implementing the Adjustable Interest Rate Act. The regulations provide a statutory fallback mechanism to replace LIBOR, by identifying benchmark rates based on the Secured Overnight Financing Rate (“SOFR”) that replaced LIBOR in certain financial contracts after June 30, 2023. These regulations apply only to contracts governed by U.S. law, among other limitations. The Funds may have instruments linked to other interbank offered rates that may also cease to be published in the future. The effects of such uncertainty and risks in “legacy” USD LIBOR instruments held by the Fund could result in losses to the Fund. |
| Leverage Risk [Member] | |
| General Description of Registrant [Abstract] | |
| Risk [Text Block] | M. Leverage Risk |
| Collateral [Member] | |
| General Description of Registrant [Abstract] | |
| Risk [Text Block] | N. Collateral |
| Other Risks [Member] | |
| General Description of Registrant [Abstract] | |
| Risk [Text Block] | O. Other Risks Mortgage- and asset-backed securities, including collateralized debt obligations and collateralized mortgage obligations, are subject to prepayment or call risk, which is the risk that a borrower’s payments may be received earlier or later than expected due to changes in prepayment rates on underlying loans. This could result in the Fund reinvesting these early payments at lower interest rates, thereby reducing the Fund’s income. Mortgage- and asset-backed securities also are subject to extension risk, which is the risk that an unexpected rise in interest rates could reduce the rate of prepayments, causing the price of the mortgage- and asset-backed securities and the Fund’s share price to fall. An unexpectedly high rate of defaults on the mortgages held by a mortgage pool may adversely affect the value of mortgage-backed securities and could result in losses to the Fund. Privately-issued mortgage-backed securities and asset-backed securities may be less liquid than other types of securities and the Fund may be unable to sell these securities at the time or price it desires. Increases in the federal funds and equivalent foreign rates or other changes to monetary policy or regulatory actions may expose fixed income markets to heightened volatility and reduced liquidity for certain fixed income investments, particularly those with longer maturities. It is difficult to predict the impact of interest rate changes on various markets. In addition, decreases in fixed income dealer market-making capacity may also potentially lead to heightened volatility and reduced liquidity in the fixed income markets. As a result, the value of the Fund’s investments and share price may decline. Changes in central bank policies could also result in higher than normal redemptions by shareholders, which could potentially increase the Fund’s portfolio turnover rate and transaction costs. Policy changes by the U.S. government or its regulatory agencies and political events within the U.S. and abroad may, among other things, affect investor and consumer confidence and increase volatility in the financial markets, perhaps suddenly and to a significant degree, which may adversely impact the Fund’s operations, universe of potential investment options, and return potential. Preferred securities are subject to issuer-specific and market risks applicable generally to equity securities. Preferred securities also may be subordinated to bonds or other debt instruments, subjecting them to a greater risk of non‑payment, may be less liquid than many other securities, such as common stocks, and generally offer no voting rights with respect to the issuer. |
