N-2	3 Months Ended
N-2	Mar. 31, 2023
Cover [Abstract]
Entity Central Index Key	0001422183
Amendment Flag	false
Securities Act File Number	814-00757
Document Type	10-Q
Entity Registrant Name	FS KKR Capital Corp.
Entity Address, Address Line One	201 Rouse Boulevard
Entity Address, City or Town	Philadelphia
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	19112
City Area Code	215
Local Phone Number	495-1150
Entity Emerging Growth Company	false
General Description of Registrant [Abstract]
Investment Objectives and Practices [Text Block]	Our investment objectives are to generate current income and, to a lesser extent, long-term capital appreciation. We seek to meet our investment objectives by: •utilizing the experience and expertise of the management team of the Advisor; •employing a defensive investment approach focused on long-term credit performance and principal protection; •focusing primarily on debt investments in a broad array of private U.S. companies, including middle-market companies, which we define as companies with annual EBITDA of $25 million to $100 million at the time of investment; •investing primarily in established, stable enterprises with positive cash flows; and •maintaining rigorous portfolio monitoring in an attempt to anticipate and pre-empt negative credit events within our portfolio, such as an event of insolvency, liquidation, dissolution, reorganization or bankruptcy of a portfolio company. We pursue our investment objective by investing primarily in the debt of middle market U.S. companies with a focus on originated transactions sourced through the network of the Advisor and its affiliates. We define direct originations as any investment where the Company's investment adviser, sub-adviser or their affiliates had negotiated the terms of the transaction beyond just the price, which, for example, may include negotiating financial covenants, maturity dates or interest rate terms. These directly originated transactions include participation in other originated transactions where there may be third parties involved, or a bank acting as an intermediary, for a closely held club, or similar transactions. Our portfolio is comprised primarily of investments in senior secured loans and second lien secured loans of private middle market U.S. companies and, to a lesser extent, subordinated loans and certain asset-based financing loans of private U.S. companies. Although we do not expect a significant portion of our portfolio to be comprised of subordinated loans, there is no limit on the amount of such loans in which we may invest. We may purchase interests in loans or make other debt investments, including investments in senior secured bonds, through secondary market transactions in the “over-the-counter” market or directly from our target companies as primary market or directly originated investments. In connection with our debt investments, we may on occasion receive equity interests such as warrants or options as additional consideration. We may also purchase or otherwise acquire interests in the form of common or preferred equity or equity-related securities, such as rights and warrants that may be converted into or exchanged for common stock or other equity or the cash value of common stock or other equity, including through a co-investment with a financial sponsor or possibly the restructuring of an investment. In addition, a portion of our portfolio may be comprised of corporate bonds, structured products, other debt securities and derivatives, including total return swaps and credit default swaps. The Advisor will seek to tailor our investment focus as market conditions evolve. Depending on market conditions, we may increase or decrease our exposure to less senior portions of the capital structures of our portfolio companies or otherwise make opportunistic investments, such as where the market price of loans, bonds or other securities reflects a lower value than deemed warranted by the Advisor's fundamental analysis. Such investment opportunities may occur due to general dislocations in the markets, a misunderstanding by the market of a particular company or an industry being out of favor with the broader investment community and may include event driven investments, anchor orders and structured products. The senior secured loans, second lien secured loans and senior secured bonds in which we invest generally have stated terms of three to seven years and subordinated debt investments that we make generally have stated terms of up to ten years, but the expected average life of such securities is generally three to four years. However, we may invest in loans and securities with any maturity or duration. Our debt investments may be rated by a NRSRO and, in such case, generally will carry a rating below investment grade (rated lower than “Baa3” by Moody’s or lower than “BBB-” by S&P). We may invest without limit in debt or other securities of any rating, as well as debt or other securities that have not been rated by a NRSRO.
Risk Factors [Table Text Block]	Risk Factors. In addition to the other information set forth in this Quarterly Report on Form 10-Q, you should carefully consider the risk factors that appeared under Item 1A. “Risk Factors” in our most recent Annual Report on Form 10-K. There are no material changes from the risk factors included within our most recent Annual Report on Form 10-K other than the risks described below. The Russian invasion of Ukraine may have a material adverse impact on us and our portfolio companies. The conflict between Russia and Ukraine could lead to disruption, instability and volatility in global markets, economies and industries that could negatively impact our business, results of operations and financial condition. The conflict has already resulted in significant volatility in certain equity, debt and currency markets, material increases in certain commodity prices, and economic uncertainty. The conflict may escalate and its resolution is unclear. The U.S. government and other governments have imposed severe sanctions against Russia and Russian interests and threatened additional sanctions and controls. Sanctions and export control laws and regulations are complex, frequently changing, and increasing in number, and they may impose additional legal compliance costs or business risks associated with our operations.
Risk [Text Block]	The Russian invasion of Ukraine may have a material adverse impact on us and our portfolio companies. The conflict between Russia and Ukraine could lead to disruption, instability and volatility in global markets, economies and industries that could negatively impact our business, results of operations and financial condition. The conflict has already resulted in significant volatility in certain equity, debt and currency markets, material increases in certain commodity prices, and economic uncertainty. The conflict may escalate and its resolution is unclear. The U.S. government and other governments have imposed severe sanctions against Russia and Russian interests and threatened additional sanctions and controls. Sanctions and export control laws and regulations are complex, frequently changing, and increasing in number, and they may impose additional legal compliance costs or business risks associated with our operations.