Common Shares [Member] Investment and Market Risk [Member] Below Investment Grade (High-Yield or Junk Bond) Securities Risk [Member] Fixed Income Securities Risk [Member] Issuer Risk [Member] Prepayment Risk [Member] Reinvestment Risk [Member] Foreign Securities and Emerging Markets Risk [Member] Foreign Currency Risk [Member] Repurchase Agreements Risk [Member] Derivatives Risk [Member] Leverage Risk [Member] Liquidity Risk [Member] Management Risk [Member] Government Intervention in Financial Markets Risk [Member] Asset-Backed, Mortgage-Backed or Mortgage-Related Securities Risk [Member] Market Price Discount from Net Asset Value Risk [Member] Anti-Takeover Provisions Risk [Member] U.S. Government Debt Securities Risk [Member] Non-U.S. Government Debt Securities Risk [Member] Senior Loans Risk [Member] Second Lien Loans Risk [Member] Loan Participations and Assignments Risk [Member] Common Stock Risk [Member] Preferred Stock Risk [Member] Convertible Securities Risk [Member] Short Sales Risk [Member] Risk of Short Economic Exposure Through Derivatives [Member] Counterparty Risk [Member] Credit Default Swap Risk [Member] Structured Notes and Related Instruments Risk [Member] Inflation/Deflation Risk [Member] Risks of Futures and Options on Futures [Member] When-Issued and Delayed-Delivery Transactions Risk [Member] Portfolio Turnover Risk [Member] Temporary Defensive Strategies Risk [Member] Rating Agency Risk [Member] Market Events Risk [Member] Operational Risk [Member] Valuation Risk [Member] Tax Risks [Member] Cybersecurity Risk [Member] Credit Risk [Member]