1001 - Disclosure - N-2 - [Fee Table] link:presentationLink link:definitionLink link:calculationLink 1002 - Disclosure - N-2 - [Investment Objectives] link:presentationLink link:definitionLink link:calculationLink 1003 - Disclosure - N-2 - [Risk Factors] link:presentationLink link:definitionLink link:calculationLink 1004 - Disclosure - N-2 - [Effects of Leverage] link:presentationLink link:definitionLink link:calculationLink 1005 - Disclosure - N-2 - [Share Price Table] link:presentationLink link:definitionLink link:calculationLink 1006 - Disclosure - N-2 - [Outstanding Securities] link:presentationLink link:definitionLink link:calculationLink Anti-Takeover Provisions [Member] Borrowing Risk [Member] Call Option Risk [Member] Common Stock Risk [Member] Counterparty Risk [Member] Cybersecurity Risk [Member] Deflation Risk [Member] Derivatives Risk [Member] Dividend Income Risk [Member] Financial Services Sector Risk [Member] Frequent Trading Risk [Member] Fund Tax Risk [Member] Global Economic Risk [Member] Hedging Risk [Member] Inflation Risk [Member] Information Technology Sector Risk [Member] Investment and Market Risk [Member] Large-Cap Company Risk [Member] Legislation and Regulatory Risk [Member] Market Discount from Net Asset Value [Member] Options Strategy Risk [Member] Other Investment Companies Risk [Member] Quantitative Analysis Risk [Member] Recent Market Conditions [Member] Restricted and Illiquid Investments Risk [Member] Swap Transactions Risk [Member] U. S. Government Securities Risk [Member] U.S. Government Securities Risk[Member] Valuation Risk [Member] When-Issued and Delayed-Delivery Transaction Risk [Member] Common Shares [Member]