DEBT - Schedule of Components of Debt Interest Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Line of Credit Facility [Line Items]
Amortization of debt issuance costs			$ 16	$ 15
Net amortization of original issue premium/discount			(3)	(2)
Interest and credit facility fees	$ 174	$ 141	333	280
Cash paid for interest expense			288	271
Senior Notes
Line of Credit Facility [Line Items]
Stated interest expense	103	61	196	124
Amortization of debt issuance costs	4	4	8	7
Net amortization of original issue premium/discount	(1)	(1)	(3)	(3)
Interest and credit facility fees	106	64	201	128
Cash paid for interest expense	59	55	157	134
Revolving Credit Facility
Line of Credit Facility [Line Items]
Average outstanding balance	1,242	1,995	1,220	2,114
Revolving Credit Facility | Line of Credit
Line of Credit Facility [Line Items]
Stated interest expense	23	34	45	68
Credit facility fees	3	3	7	6
Amortization of debt issuance costs	3	2	5	4
Interest and credit facility fees	29	39	57	78
Cash paid for interest expense	$ 23	$ 43	$ 61	$ 75
Average stated interest rate	7.34%	6.84%	7.31%	6.37%
Revolving Funding Facility
Line of Credit Facility [Line Items]
Average outstanding balance	$ 747	$ 865	$ 645	$ 838
Revolving Funding Facility | Line of Credit
Line of Credit Facility [Line Items]
Stated interest expense	14	15	24	28
Credit facility fees	2	2	4	3
Amortization of debt issuance costs	1	1	2	2
Interest and credit facility fees	17	18	30	33
Cash paid for interest expense	$ 13	$ 15	$ 26	$ 27
Average stated interest rate	7.40%	7.10%	7.39%	6.75%
SMBC Funding Facility
Line of Credit Facility [Line Items]
Average outstanding balance	$ 346	$ 413	$ 316	$ 420
SMBC Funding Facility | Line of Credit
Line of Credit Facility [Line Items]
Stated interest expense	7	7	12	14
Credit facility fees	1	0	2	1
Amortization of debt issuance costs	0	0	1	1
Interest and credit facility fees	8	7	15	16
Cash paid for interest expense	$ 6	$ 7	$ 12	$ 14
Average stated interest rate	7.95%	6.94%	7.66%	6.55%
BNP Funding Facility
Line of Credit Facility [Line Items]
Average outstanding balance	$ 537	$ 402	$ 555	$ 353
BNP Funding Facility | Line of Credit
Line of Credit Facility [Line Items]
Stated interest expense	10	8	23	13
Credit facility fees	0	0	0	1
Amortization of debt issuance costs	0	1	0	1
Interest and credit facility fees	10	9	23	15
Cash paid for interest expense	$ 11	$ 7	$ 23	$ 12
Average stated interest rate	7.93%	7.90%	8.03%	7.48%
2024-1 CLO Notes | Secured Debt
Line of Credit Facility [Line Items]
Stated interest expense	$ 4		$ 4
Amortization of debt issuance costs	0		0
Interest and credit facility fees	4		4
Cash paid for interest expense	$ 0		$ 0
Average stated interest rate	7.24%		7.24%
Average outstanding balance	$ 199		$ 99
Convertible Unsecured Notes | Convertible Debt
Line of Credit Facility [Line Items]
Stated interest expense	0	$ 4	3	$ 9
Net amortization of original issue premium/discount	0	0	0	1
Interest and credit facility fees	0	4	3	10
Cash paid for interest expense	$ 0	$ 0	$ 9	$ 9