| N-2 | 6 Months Ended |
| Aug. 31, 2023 | |
| Cover [Abstract] | |
| Entity Central Index Key | 0001682811 |
| Amendment Flag | false |
| Document Type | N-CSRS |
| Entity Registrant Name | Invesco High Income 2023 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, 2023 (the “Termination Date”). |
| Risk Factors [Table Text Block] | M. Leverage Risk – N. Collateral – O. Other Risks – 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. |
| 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 – 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. |
