INVESTMENTS - Selected Financial Information for the SLDP (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024		Dec. 31, 2023		Dec. 31, 2022
Schedule of Investments [Line Items]
Amortized Cost	$ 26,374.0	[1]	$ 22,667.6	[2]
Fair Value	26,719.9	[1]	22,873.7	[2]
Other assets	158.0		101.0
Total assets	28,254.0		23,800.0
Total liabilities	14,899.0		12,599.0
Total liabilities and stockholders’ equity	28,254.0		23,800.0
Total investment income	2,990.0		2,614.0		$ 2,096.0
Interest expense	715.0		582.0		455.0
Other expenses	31.0		29.0		27.0
Total expenses	1,514.0		1,328.0		949.0
Net investment income	1,403.0		1,266.0		1,092.0
Net realized and unrealized losses on investments	133.0		256.0		(444.0)
Net increase in members’ capital resulting from operations	1,522.0		1,522.0		600.0
Senior Direct Lending Program
Schedule of Investments [Line Items]
Amortized Cost	4,591.0		5,267.0
Fair Value	4,390.0		5,129.0
Other assets	449.0		192.0
Total assets	4,839.0		5,321.0
Senior notes	3,428.0		3,705.0
Intermediate funding notes	130.0		139.0
Other liabilities	124.0		136.0
Total liabilities	3,682.0		3,980.0
Subordinated certificates and members’ capital	1,157.0		1,341.0
Total liabilities and stockholders’ equity	4,839.0		5,321.0
Total investment income	541.0		570.0		365.0
Interest expense	292.0		296.0		155.0
Other expenses	17.0		23.0		20.0
Total expenses	309.0		319.0		175.0
Net investment income	232.0		251.0		190.0
Net realized and unrealized losses on investments	(157.0)		(73.0)		(147.0)
Net increase in members’ capital resulting from operations	$ 75.0		$ 178.0		$ 43.0

[1] As of December 31, 2024, the estimated net unrealized gain for federal tax purposes was $0.2 billion based on a tax cost basis of $26.5 billion. As of December 31, 2024, the estimated aggregate gross unrealized gain for federal income tax purposes was $1.7 billion and the estimated aggregate gross unrealized loss for federal income tax purposes was $1.5 billion.     

[2] As of December 31, 2023, the estimated net unrealized loss for federal tax purposes was $0.4 billion based on a tax cost basis of $22.5 billion. As of December 31, 2023, the estimated aggregate gross unrealized loss for federal income tax purposes was $1.7 billion and the estimated aggregate gross unrealized gain for federal income tax purposes was $1.3 billion.