Financing Arrangements - Narrative (Details) € in Millions, £ in Millions, $ in Millions, $ in Millions									12 Months Ended
	Oct. 12, 2024	Jul. 15, 2024	Apr. 15, 2022	Dec. 22, 2020 USD ($)	Nov. 22, 2019 USD ($)	Aug. 09, 2018 USD ($)	Dec. 02, 2015 USD ($)	Feb. 20, 2014 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2024 EUR (€)	Dec. 31, 2024 GBP (£)	Dec. 31, 2024 AUD ($)	Dec. 31, 2024 CAD ($)	Dec. 27, 2024 USD ($)	Nov. 20, 2024 USD ($)	Jun. 06, 2024 USD ($)	Dec. 31, 2023 EUR (€)	Dec. 31, 2023 GBP (£)	Dec. 31, 2023 AUD ($)	Dec. 31, 2023 CAD ($)	Nov. 21, 2023 USD ($)	Dec. 31, 2022 USD ($)	Nov. 14, 2022	Jan. 18, 2022 USD ($)	Dec. 31, 2021 USD ($)	Oct. 12, 2021 USD ($)	Jun. 17, 2021 USD ($)	Jun. 16, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 10, 2020 USD ($)	Apr. 30, 2020 USD ($)	Dec. 17, 2019 USD ($)	Nov. 20, 2019 USD ($)	Jul. 26, 2019 USD ($)	Jul. 15, 2019 USD ($)	Jun. 25, 2019 USD ($)	Jun. 15, 2019	Jun. 14, 2019	Apr. 30, 2015 USD ($)
Debt Instrument [Line Items]
Asset coverage per ratio (as percent)									190.00%	183.00%	190.00%	190.00%	190.00%	190.00%				183.00%	183.00%	183.00%	183.00%		180.00%			184.00%				177.00%
Amount outstanding									$ 7,385,000,000	$ 8,223,000,000													$ 8,731,000,000			$ 9,179,000,000				$ 4,042,000,000
Amount outstanding									$ 8,088,000,000	$ 8,528,000,000
Average outstanding									5.51%	5.29%	5.51%	5.51%	5.51%	5.51%				5.29%	5.29%	5.29%	5.29%
Debt instrument, interest rate, effective percentage									5.45%	5.42%	5.45%	5.45%	5.45%	5.45%				5.42%	5.42%	5.42%	5.42%
Unsecured Notes
Debt Instrument [Line Items]
Debt instrument, redemption price									100.00%
Ambler Credit Facility | Line of Credit
Debt Instrument [Line Items]
Debt service coverage ratio, minimum (as percent)					150.00%
CCT Tokyo Funding Credit Facility
Debt Instrument [Line Items]
Non usage fee (as percent)																								0.50%
CCT Tokyo Funding Credit Facility | Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis spread on variable rate (as percent)							1.00%
CCT Tokyo Funding Credit Facility | Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate (as percent)							0.00%
CCT Tokyo Funding Credit Facility | Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity							$ 300,000,000
Stated interest rate (as percent)							0.50%
Senior Secured Revolving Credit Facility
Debt Instrument [Line Items]
Debt securities accumulated loss																																					$ 378,700,000
Senior Secured Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Debt service coverage ratio, minimum (as percent)						150.00%
Senior Secured Revolving Credit Facility | Senior Debt | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Payments for repurchase of private placement				$ 383,700,000
4.125% Notes due 2025 | Unsecured Notes
Debt Instrument [Line Items]
Amount outstanding									$ 470,000,000	$ 470,000,000
Debt instrument, face amount																																	$ 45,000,000	$ 425,000,000
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%
4.250% Unsecured Notes due 2025 | Unsecured Notes
Debt Instrument [Line Items]
Amount outstanding									$ 475,000,000	$ 475,000,000
Debt instrument, face amount																													$ 475,000,000
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%
8.625% Notes due 2025 | Unsecured Notes
Debt Instrument [Line Items]
Amount outstanding									$ 250,000,000	$ 250,000,000
Debt instrument, face amount																																$ 250,000,000
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%
3.400% Notes due 2026 | Unsecured Notes
Debt Instrument [Line Items]
Amount outstanding									$ 1,000,000,000	$ 1,000,000,000
Debt instrument, face amount																															$ 1,000,000,000
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%
2.625% Notes due 2027 | Unsecured Notes
Debt Instrument [Line Items]
Amount outstanding									$ 400,000,000	$ 400,000,000
Debt instrument, face amount																												$ 400,000,000
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%
3.250% Notes due 2027 | Unsecured Notes
Debt Instrument [Line Items]
Amount outstanding									$ 500,000,000	$ 500,000,000
Debt instrument, face amount																									$ 500,000,000
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%
1.650% Notes due 2024 | Unsecured Notes
Debt Instrument [Line Items]
Amount outstanding										$ 500,000,000
Debt instrument, face amount																											$ 500,000,000
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%
Redemption of principal percentage	100.00%
3.125% Notes due 2028 | Unsecured Notes
Debt Instrument [Line Items]
Amount outstanding									$ 750,000,000	$ 750,000,000
Debt instrument, face amount																											$ 750,000,000
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%
7.875% Notes due 2029 | Unsecured Notes
Debt Instrument [Line Items]
Amount outstanding									$ 400,000,000	$ 400,000,000
Debt instrument, face amount																						$ 400,000,000
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%
4.625% Notes due 2024 | Unsecured Notes
Debt Instrument [Line Items]
Amount outstanding										$ 400,000,000
Debt instrument, face amount																																				$ 400,000,000
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%
Debt instrument, redemption price		100.00%
6.875% Notes due 2029 | Unsecured Notes
Debt Instrument [Line Items]
Amount outstanding									$ 600,000,000
Debt instrument, face amount																	$ 600,000,000
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%
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%
6.125% Notes due 2030 | Unsecured Notes
Debt Instrument [Line Items]
Amount outstanding									$ 700,000,000
Debt instrument, face amount															$ 700,000,000	$ 600,000,000
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%
Additional amount issued															$ 100,000,000
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%
4.750% Notes due 2022 | Unsecured Notes
Debt Instrument [Line Items]
Debt instrument, face amount																																			$ 175,000,000					$ 275,000,000
Stated interest rate (as percent)			4.75%						4.75%	4.75%	4.75%	4.75%	4.75%	4.75%				4.75%	4.75%	4.75%	4.75%		4.75%												4.75%					4.75%
Debt instrument, redemption price			100.00%
Class A-1R Senior Secured Floating Rate Notes | Senior Debt | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Principal amount				$ 281,400,000
Variable rate (as percent)				1.85%
Class A-2R Senior Secured Floating Rate Notes | Senior Debt | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Principal amount				$ 20,500,000
Variable rate (as percent)				2.25%
Class B-1R Senior Secured Floating Rate Notes | Senior Debt | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Principal amount				$ 32,400,000
Variable rate (as percent)				2.60%
Class B-2R Senior Secured Fixed Rate Notes | Senior Debt | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Principal amount				$ 17,400,000
Variable rate (as percent)				3.011%
Class C-R Secured Deferrable Floating Rate Notes | Senior Debt | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Principal amount				$ 32,000,000.0
Variable rate (as percent)				3.10%
Revolving Credit Facility | Ambler Credit Facility | Minimum
Debt Instrument [Line Items]
Non usage fee (as percent)					0.50%
Revolving Credit Facility | Ambler Credit Facility | Maximum
Debt Instrument [Line Items]
Non usage fee (as percent)					0.75%
Revolving Credit Facility | Ambler Credit Facility | Line of Credit
Debt Instrument [Line Items]
Amount outstanding									$ 133,000,000	$ 132,000,000
Debt instrument, face amount					$ 200,000,000
Line of credit facility, maximum borrowing capacity					$ 250,000,000
Basis spread on variable rate (as percent)									2.25%	2.75%
Revolving Credit Facility | Ambler Credit Facility | Line of Credit | Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis spread on variable rate (as percent)					2.25%
Revolving Credit Facility | CCT Tokyo Funding Credit Facility | Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate (as percent)							1.05%
Revolving Credit Facility | CCT Tokyo Funding Credit Facility | Line of Credit
Debt Instrument [Line Items]
Amount outstanding									$ 147,000,000	$ 294,000,000
Line of credit facility, maximum borrowing capacity							$ 100,000,000
Revolving Credit Facility | CCT Tokyo Funding Credit Facility | Line of Credit | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (as percent)									1.90%	1.90%
Revolving Credit Facility | CCT Tokyo Funding Credit Facility | Line of Credit | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (as percent)									2.05%	2.05%
Revolving Credit Facility | CCT Tokyo Funding Credit Facility | Line of Credit | Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Debt instrument, interest rate, effective percentage							1.90%
Basis spread on variable rate (as percent)							2.05%
Revolving Credit Facility | Darby Creek Credit Facility | Line of Credit
Debt Instrument [Line Items]
Amount outstanding									$ 500,000,000	$ 654,000,000
Debt instrument, face amount								$ 750,000,000
Basis spread on variable rate (as percent)									2.65%	2.65%
Revolving Credit Facility | Darby Creek Credit Facility | Line of Credit | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt instrument, interest rate, effective percentage								0.375%
Basis spread on variable rate (as percent)								2.65%
Stated interest rate (as percent)								2.90%
Revolving Credit Facility | Meadowbrook Run Credit Facility | Line of Credit
Debt Instrument [Line Items]
Amount outstanding									$ 200,000,000	$ 225,000,000
Debt instrument, face amount					$ 300,000,000
Line of credit facility, maximum borrowing capacity					$ 400,000,000
Basis spread on variable rate (as percent)									2.70%	2.70%
Revolving Credit Facility | Meadowbrook Run Credit Facility | Line of Credit | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate (as percent)					2.70%
Stated interest rate (as percent)					3.20%
Line of credit facility, commitment fee					70.00%
Revolving Credit Facility | Meadowbrook Run Credit Facility | Line of Credit | London Interbank Offered Rate (LIBOR) | Minimum
Debt Instrument [Line Items]
Non usage fee (as percent)					0.25%
Revolving Credit Facility | Meadowbrook Run Credit Facility | Line of Credit | London Interbank Offered Rate (LIBOR) | Maximum
Debt Instrument [Line Items]
Non usage fee (as percent)					0.50%
Revolving Credit Facility | Senior Secured Revolving Credit Facility
Debt Instrument [Line Items]
Amount outstanding																		€ 356	£ 88	$ 38	$ 4
Revolving Credit Facility | Senior Secured Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Amount outstanding									$ 628,000,000	$ 1,429,000,000	€ 455	£ 165	$ 4	$ 3
Line of credit facility, maximum borrowing capacity						$ 4,670,000,000
Line of credit facility accordion feature increase limit						$ 2,335,000,000
Revolving Credit Facility | Senior Secured Revolving Credit Facility | Line of Credit | Base Rate Option
Debt Instrument [Line Items]
Borrowing rate test threshold									160.00%
Revolving Credit Facility | Senior Secured Revolving Credit Facility | Line of Credit | Base Rate Option - Less Than
Debt Instrument [Line Items]
Basis spread on variable rate (as percent)						0.875%
Borrowing rate test threshold									160.00%
Revolving Credit Facility | Senior Secured Revolving Credit Facility | Line of Credit | Eurocurrency Option
Debt Instrument [Line Items]
Borrowing rate test threshold									160.00%
Revolving Credit Facility | Senior Secured Revolving Credit Facility | Line of Credit | Eurocurrency Option - Less Than
Debt Instrument [Line Items]
Line of credit facility, commitment fee						0.375%
Borrowing rate test threshold									160.00%
Revolving Credit Facility | Senior Secured Revolving Credit Facility | Line of Credit | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (as percent)									1.75%	1.75%
Revolving Credit Facility | Senior Secured Revolving Credit Facility | Line of Credit | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (as percent)									1.88%	1.88%
Revolving Credit Facility | Senior Secured Revolving Credit Facility | Line of Credit | Secured Overnight Financing Rate (SOFR) | Base Rate Option
Debt Instrument [Line Items]
Basis spread on alternative base rate (as percent)						1.00%
Revolving Credit Facility | Senior Secured Revolving Credit Facility | Line of Credit | Secured Overnight Financing Rate (SOFR) | Eurocurrency Option
Debt Instrument [Line Items]
Basis spread on variable rate (as percent)						1.75%
Revolving Credit Facility | Senior Secured Revolving Credit Facility | Line of Credit | Secured Overnight Financing Rate (SOFR) | Eurocurrency Option - Less Than
Debt Instrument [Line Items]
Basis spread on variable rate (as percent)						1.875%
Revolving Credit Facility | Senior Secured Revolving Credit Facility | Line of Credit | Base Rate | Base Rate Option
Debt Instrument [Line Items]
Basis spread on alternative base rate (as percent)						0.50%
Revolving Credit Facility | Senior Secured Revolving Credit Facility | Line of Credit | Alternative Base Rate | Base Rate Option
Debt Instrument [Line Items]
Basis spread on variable rate (as percent)						0.75%
Term Loan Advances | CCT Tokyo Funding Credit Facility | Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity							$ 200,000,000
Term Loan Advances | CCT Tokyo Funding Credit Facility | Line of Credit | Base Rate
Debt Instrument [Line Items]
Debt instrument, interest rate, effective percentage							0.90%
Letter of Credit | Senior Secured Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Debt instrument, face amount						$ 400,000,000
Line of credit facility, maximum borrowing capacity						$ 175,000,000			$ 175,000,000
Standby Letters of Credit | Senior Secured Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Long-term line of credit									$ 21,000,000	$ 18,000,000
Investment Advisory Agreement | FS/KKR Advisor, LLC
Debt Instrument [Line Items]
Asset coverage per ratio (as percent)																																						150.00%	200.00%