Investment Companies Sector [Member] Net Other Assets and Liabilities Sector [Member] Consumer Cyclical [Member] Consumer Non cyclical [Member] Basic Materials [Member] Unfunded Floating Rate Loan Interests Commitments [Member] Forward Foreign Currency Exchange Contracts [Member] Equity Securities Preferred Stocks [Member] Equity Securities Common Stocks [Member] Fixed Rate Loan Interests [Member] Convertible Corporate Bonds and Notes [Member] Floating Rate Loan Interests [Member] Corporate Bonds and Notes [Member] Net Other Assets and Liabilities [Member] Investment Companies [Member] C000000793 [Member] Class I C000000792 [Member] Class C C000000790 [Member] Class A Asset Backed Securities [Member] Technology Sector [Member] Financial Services Sector [Member] Energy Sector [Member] Collateralized Loan Obligations [Member] Investment Type [Axis] Net Assets Investment Company Portfolio Turnover No Trading Symbol Flag