1001 - Disclosure - N-2 - [Fee Table] link:presentationLink link:definitionLink link:calculationLink 1002 - Disclosure - N-2 - [Senior Securities] link:presentationLink link:definitionLink link:calculationLink 1003 - Disclosure - N-2 - [Investment Objectives] link:presentationLink link:definitionLink link:calculationLink 1004 - Disclosure - N-2 - [Risk Factors] link:presentationLink link:definitionLink link:calculationLink 1005 - Disclosure - N-2 - [Effects of Leverage] link:presentationLink link:definitionLink link:calculationLink 1006 - Disclosure - N-2 - [Share Price Table] link:presentationLink link:definitionLink link:calculationLink 1007 - Disclosure - N-2 - [Capital Stock] link:presentationLink link:definitionLink link:calculationLink 1008 - Disclosure - N-2 - [Other Securities] link:presentationLink link:definitionLink link:calculationLink 1009 - Disclosure - N-2 - [Outstanding Securities] link:presentationLink link:definitionLink link:calculationLink V R D P Shares [Member] VRDP Shares T O B Trust Certificates [Member] TOB Trust Certificates Series W 7 V R D P Shares [Member] Series W-7 VRDP Shares Preferred Shares [Member] Common Shares [Member] Counterparty Risk [Member] Event Risk [Member] Information Technology Systems Risk [Member] Deferral Risk [Member] New Types of Securities Risk [Member] Deflation Risk [Member] Market Disruption and Geopolitical Risk [Member] Subordination Risk [Member] Reliance on Service Providers Risk [Member] Private Activity Bonds [Member] Management Risk [Member] Reliance on the Advisor Risk [Member] Failures of Futures Commission Merchants and Clearing Organizations Risk [Member] Valuation Risk [Member] Portfolio Turnover Risk [Member] When-Issued, Forward Commitment and Delayed Delivery Transactions Risk [Member] Decision-Making Authority Risk [Member] Risks Associated with Recent Market Events [Member] Repurchase Agreements Risk [Member] Special Redemption Rights Risk [Member] Swaps Risk [Member] U.S. Government Securities Risk [Member] Defensive Investing Risk [Member] Regulation and Government Intervention Risk [Member] Anti-Takeover Provisions Risk[Member] Potential Conflicts of Interest of the Advisor and Others [Member] Unrated Securities Risk [Member] Strategic Transactions and Derivatives Risk [Member] Securities Lending Risk [Member] Variable Rate Demand Obligations Risk [Member] Operational and Technology Risks [Member] General Risks [Member] Legal, Tax and Regulatory Risks [Member] Preferred Securities Risk [Member] Misconduct of Employees and of Service Providers Risk [Member] Zero-Coupon Securities Risk [Member] Reference Rate Replacement Risk [Member] Limited Voting Rights Risk [Member] Regulation as a "Commodity Pool" [Member] Inflation Risk [Member]