Debt Instrument, Basis Spread On Variable Rate, Credit Spread Adjustment

No definition available.

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Namespace Prefix:	fsk_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Variable Rate, Floor

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Revolving Commitment Outstanding

+ References

No definition available.

+ Details

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Namespace Prefix:	fsk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Term Loan Outstanding

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

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Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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- Definition

Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency.

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Balance Type:	credit
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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Financing Arrangements - Outstanding Financing Arrangements (Details) € in Millions, £ in Millions, $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2024 EUR (€)	Dec. 31, 2024 CAD ($)	Dec. 31, 2024 GBP (£)	Dec. 31, 2024 AUD ($)	Dec. 27, 2024	Nov. 20, 2024	Oct. 12, 2024	Jul. 15, 2024	Jun. 06, 2024	Dec. 31, 2023 EUR (€)	Dec. 31, 2023 CAD ($)	Dec. 31, 2023 GBP (£)	Dec. 31, 2023 AUD ($)	Nov. 21, 2023	Dec. 31, 2022 USD ($)	Jan. 18, 2022	Dec. 31, 2021 USD ($)	Oct. 12, 2021	Jun. 17, 2021	Jun. 16, 2021	Dec. 31, 2020 USD ($)	Dec. 10, 2020	Apr. 30, 2020	Nov. 20, 2019	Jul. 15, 2019	Dec. 02, 2015
Debt Instrument [Line Items]
Senior securities issued	$ 7,385,000,000	$ 8,223,000,000															$ 8,731,000,000		$ 9,179,000,000				$ 4,042,000,000
Amount Available	4,363,000,000	3,409,000,000
Derivative Assets Subject to Master Netting Agreement	3,000,000	$ 13,000,000
Interest Rate Swap
Debt Instrument [Line Items]
Derivative Assets Subject to Master Netting Agreement	$ 15,000,000
Ambler Credit Facility \| Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Basis spread on variable rate (as percent)	2.25%	2.75%
Senior securities issued	$ 133,000,000	$ 132,000,000
Amount Available	$ 67,000,000	$ 68,000,000
Floor on benchmark rate (as percent)	0.00%	0.00%
CCT Tokyo Funding Credit Facility \| Line of Credit
Debt Instrument [Line Items]
Stated interest rate (as percent)																												0.50%
CCT Tokyo Funding Credit Facility \| Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Senior securities issued	$ 147,000,000	$ 294,000,000
Amount Available	$ 0	$ 0
Floor on benchmark rate (as percent)	0.00%	0.00%
CCT Tokyo Funding Credit Facility \| Line of Credit \| Revolving Credit Facility \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (as percent)	1.90%	1.90%
CCT Tokyo Funding Credit Facility \| Line of Credit \| Revolving Credit Facility \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (as percent)	2.05%	2.05%
Darby Creek Credit Facility \| Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Basis spread on variable rate (as percent)	2.65%	2.65%
Senior securities issued	$ 500,000,000	$ 654,000,000
Amount Available	$ 250,000,000	$ 96,000,000
Floor on benchmark rate (as percent)	0.00%	0.00%
Meadowbrook Run Credit Facility \| Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Basis spread on variable rate (as percent)	2.70%	2.70%
Senior securities issued	$ 200,000,000	$ 225,000,000
Amount Available	$ 100,000,000	$ 75,000,000
Floor on benchmark rate (as percent)	0.00%	0.00%
Senior Secured Revolving Credit Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Senior securities issued												€ 356	$ 4	£ 88	$ 38
Senior Secured Revolving Credit Facility \| Revolving Credit Facility \| United States of America, Dollars
Debt Instrument [Line Items]
Exchange rate		1.11										1.11	1.11	1.11	1.11
Senior Secured Revolving Credit Facility \| Revolving Credit Facility \| United Kingdom, Pounds
Debt Instrument [Line Items]
Basis spread on variable rate, credit spread adjustment (as percent)	0.0326%	0.0326%
Exchange rate		1.27										1.27	1.27	1.27	1.27
Senior Secured Revolving Credit Facility \| Revolving Credit Facility \| Euro Member Countries, Euro
Debt Instrument [Line Items]
Exchange rate		1.00										1.00	1.00	1.00	1.00
Senior Secured Revolving Credit Facility \| Revolving Credit Facility \| Canada, Dollars
Debt Instrument [Line Items]
Exchange rate		0.76										0.76	0.76	0.76	0.76
Senior Secured Revolving Credit Facility \| Revolving Credit Facility \| Australia, Dollars
Debt Instrument [Line Items]
Exchange rate		0.68										0.68	0.68	0.68	0.68
Senior Secured Revolving Credit Facility \| Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Senior securities issued	$ 628,000,000	$ 1,429,000,000	€ 455	$ 3	£ 165	$ 4
Amount Available	$ 3,946,000,000	$ 3,170,000,000
Floor on benchmark rate (as percent)	0.00%	0.00%
Senior Secured Revolving Credit Facility \| Line of Credit \| Revolving Credit Facility \| United States of America, Dollars
Debt Instrument [Line Items]
Basis spread on variable rate, credit spread adjustment (as percent)	0.10%	0.10%
Senior Secured Revolving Credit Facility \| Line of Credit \| Revolving Credit Facility \| United Kingdom, Pounds
Debt Instrument [Line Items]
Exchange rate	1.25		1.25	1.25	1.25	1.25
Senior Secured Revolving Credit Facility \| Line of Credit \| Revolving Credit Facility \| Euro Member Countries, Euro
Debt Instrument [Line Items]
Exchange rate	1.04		1.04	1.04	1.04	1.04
Senior Secured Revolving Credit Facility \| Line of Credit \| Revolving Credit Facility \| Canada, Dollars
Debt Instrument [Line Items]
Exchange rate	0.69		0.69	0.69	0.69	0.69
Senior Secured Revolving Credit Facility \| Line of Credit \| Revolving Credit Facility \| Australia, Dollars
Debt Instrument [Line Items]
Exchange rate	0.62		0.62	0.62	0.62	0.62
Senior Secured Revolving Credit Facility \| Line of Credit \| Revolving Credit Facility \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (as percent)	1.75%	1.75%
Senior Secured Revolving Credit Facility \| Line of Credit \| Revolving Credit Facility \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (as percent)	1.88%	1.88%
Senior Secured Revolving Credit Facility \| Line of Credit \| Standby Letters of Credit
Debt Instrument [Line Items]
Long-term line of credit	$ 21,000,000	$ 18,000,000
4.125% Notes due 2025 \| Unsecured Notes
Debt Instrument [Line Items]
Stated interest rate (as percent)	4.125%	4.125%	4.125%	4.125%	4.125%	4.125%		4.125%				4.125%	4.125%	4.125%	4.125%	4.125%	4.125%									4.125%
Senior securities issued	$ 470,000,000	$ 470,000,000
Fair value	$ 469,000,000	$ 458,000,000
4.250% Unsecured Notes due 2025 \| Unsecured Notes
Debt Instrument [Line Items]
Stated interest rate (as percent)	4.25%	4.25%	4.25%	4.25%	4.25%	4.25%		4.25%				4.25%	4.25%	4.25%	4.25%	4.25%			4.25%			4.25%
Senior securities issued	$ 475,000,000	$ 475,000,000
Fair value	$ 474,000,000	$ 463,000,000
8.625% Notes due 2025 \| Unsecured Notes
Debt Instrument [Line Items]
Stated interest rate (as percent)	8.625%	8.625%	8.625%	8.625%	8.625%	8.625%		8.625%				8.625%	8.625%	8.625%	8.625%	8.625%	8.625%								8.625%
Senior securities issued	$ 250,000,000	$ 250,000,000
Fair value	$ 251,000,000	$ 255,000,000
3.400% Notes due 2026 \| Unsecured Notes
Debt Instrument [Line Items]
Stated interest rate (as percent)	3.40%	3.40%	3.40%	3.40%	3.40%	3.40%		3.40%				3.40%	3.40%	3.40%	3.40%	3.40%	3.40%							3.40%
Senior securities issued	$ 1,000,000,000	$ 1,000,000,000
Fair value	$ 981,000,000	$ 947,000,000
2.625% Notes due 2027 \| Unsecured Notes
Debt Instrument [Line Items]
Stated interest rate (as percent)	2.625%	2.625%	2.625%	2.625%	2.625%	2.625%		2.625%				2.625%	2.625%	2.625%	2.625%	2.625%	2.625%				2.625%
Senior securities issued	$ 400,000,000	$ 400,000,000
Fair value	$ 379,000,000	$ 359,000,000
3.250% Notes due 2027 \| Unsecured Notes
Debt Instrument [Line Items]
Stated interest rate (as percent)	3.25%	3.25%	3.25%	3.25%	3.25%	3.25%		3.25%				3.25%	3.25%	3.25%	3.25%	3.25%	3.25%	3.25%
Senior securities issued	$ 500,000,000	$ 500,000,000
Fair value	$ 474,000,000	$ 455,000,000
3.125% Notes due 2028 \| Unsecured Notes
Debt Instrument [Line Items]
Stated interest rate (as percent)	3.125%	3.125%	3.125%	3.125%	3.125%	3.125%		3.125%				3.125%	3.125%	3.125%	3.125%	3.125%	3.125%			3.125%
Senior securities issued	$ 750,000,000	$ 750,000,000
Fair value	$ 680,000,000	$ 654,000,000
7.875% Notes due 2029 \| Unsecured Notes
Debt Instrument [Line Items]
Stated interest rate (as percent)	7.875%	7.875%	7.875%	7.875%	7.875%	7.875%		7.875%				7.875%	7.875%	7.875%	7.875%	7.875%	7.875%
Senior securities issued	$ 400,000,000	$ 400,000,000
Fair value	$ 426,000,000	$ 424,000,000
6.875% Notes due 2029 \| Unsecured Notes
Debt Instrument [Line Items]
Stated interest rate (as percent)	6.875%	6.875%	6.875%	6.875%	6.875%	6.875%		6.875%			6.875%	6.875%	6.875%	6.875%	6.875%		6.875%
Senior securities issued	$ 600,000,000
Fair value	$ 615,000,000
6.875% Notes due 2029 \| Unsecured Notes \| Interest Rate Swap
Debt Instrument [Line Items]
Stated interest rate (as percent)	6.875%		6.875%	6.875%	6.875%	6.875%					6.875%
Derivative Assets Subject to Master Netting Agreement	$ 15,000,000
6.125% Notes due 2030 \| Unsecured Notes
Debt Instrument [Line Items]
Stated interest rate (as percent)	6.125%	6.125%	6.125%	6.125%	6.125%	6.125%	6.125%	6.125%				6.125%	6.125%	6.125%	6.125%		6.125%
Senior securities issued	$ 700,000,000
Fair value	$ 700,000,000
6.125% Notes due 2030 \| Unsecured Notes \| Interest Rate Swap
Debt Instrument [Line Items]
Stated interest rate (as percent)	6.125%		6.125%	6.125%	6.125%	6.125%	6.125%	6.125%			6.125%
Derivative Assets Subject to Master Netting Agreement	$ 0
Collateralized Loan Obligation Unsecured Notes \| Collateralized Loan Obligations
Debt Instrument [Line Items]
Senior securities issued	$ 232,000,000	$ 344,000,000
Floor on benchmark rate (as percent)	0.00%	0.00%
Collateralized Loan Obligation Unsecured Notes \| Collateralized Loan Obligations \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (as percent)	1.85%	1.85%
Collateralized Loan Obligation Unsecured Notes \| Collateralized Loan Obligations \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (as percent)	3.01%	3.01%
1.90% Term Loan Outstanding
Debt Instrument [Line Items]
Basis spread on variable rate (as percent)	1.90%	1.90%
Term loan outstanding	$ 98,000,000	$ 196,000,000
2.05% Commitments Outstanding
Debt Instrument [Line Items]
Basis spread on variable rate (as percent)	2.05%	2.05%
2.05% Commitments Outstanding \| Revolving Credit Facility
Debt Instrument [Line Items]
Revolving commitment outstanding	$ 49,000,000	$ 98,000,000
4.625% Notes due 2024 \| Unsecured Notes
Debt Instrument [Line Items]
Stated interest rate (as percent)	4.625%	4.625%	4.625%	4.625%	4.625%	4.625%				4.625%		4.625%	4.625%	4.625%	4.625%	4.625%	4.625%										4.625%
Senior securities issued		$ 400,000,000
Fair value		$ 397,000,000
1.650% Notes due 2024 \| Unsecured Notes
Debt Instrument [Line Items]
Stated interest rate (as percent)	1.65%	1.65%	1.65%	1.65%	1.65%	1.65%			1.65%			1.65%	1.65%	1.65%	1.65%	1.65%	1.65%			1.65%
Senior securities issued		$ 500,000,000
Fair value		$ 483,000,000
1.85% Class A-1R Notes Outstanding \| Unsecured Notes
Debt Instrument [Line Items]
Basis spread on variable rate (as percent)	1.85%
Senior securities issued	$ 161,800,000
1.85% Class A-1R Notes Outstanding \| Collateralized Loan Obligations
Debt Instrument [Line Items]
Basis spread on variable rate (as percent)		1.85%
Senior securities issued		$ 273,600,000
2.25% Class A-2R Notes Outstanding \| Unsecured Notes
Debt Instrument [Line Items]
Basis spread on variable rate (as percent)	2.25%
Senior securities issued	$ 20,500,000
2.25% Class A-2R Notes Outstanding \| Collateralized Loan Obligations
Debt Instrument [Line Items]
Basis spread on variable rate (as percent)		2.25%
Senior securities issued		$ 20,500,000
2.60% Class B-1R Notes Outstanding \| Unsecured Notes
Debt Instrument [Line Items]
Basis spread on variable rate (as percent)	2.60%
Senior securities issued	$ 32,400,000
2.60% Class B-1R Notes Outstanding \| Collateralized Loan Obligations
Debt Instrument [Line Items]
Basis spread on variable rate (as percent)		2.60%
Senior securities issued		$ 32,400,000
3.011% Class B-2R Notes Outstanding \| Unsecured Notes
Debt Instrument [Line Items]
Stated interest rate (as percent)	3.011%		3.011%	3.011%	3.011%	3.011%
Senior securities issued	$ 17,400,000
3.011% Class B-2R Notes Outstanding \| Collateralized Loan Obligations
Debt Instrument [Line Items]
Stated interest rate (as percent)		3.011%										3.011%	3.011%	3.011%	3.011%
Senior securities issued		$ 17,400,000