DEBT - Components of Debt Interest Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Line of Credit Facility [Line Items]
Amortization of debt issuance costs			$ 25	$ 23
Net amortization of original issue premium/discount			(5)	(3)
Interest and credit facility fees	$ 195	$ 145	528	425
Cash paid for interest expense			513	412
Senior Notes
Line of Credit Facility [Line Items]
Stated interest expense	102	69	298	193
Amortization of debt issuance costs	4	4	12	11
Net amortization of original issue premium/discount	(2)	(2)	(5)	(5)
Interest and credit facility fees	104	71	305	199
Cash paid for interest expense	162	80	315	214
Revolving Credit Facility
Line of Credit Facility [Line Items]
Average outstanding balance	1,818	1,479	1,420	1,885
Revolving Credit Facility | Line of Credit
Line of Credit Facility [Line Items]
Stated interest expense	33	26	78	94
Credit facility fees	3	3	10	9
Amortization of debt issuance costs	2	2	7	6
Interest and credit facility fees	38	31	95	109
Cash paid for interest expense	$ 31	$ 28	$ 92	$ 103
Average stated interest rate	7.22%	7.25%	7.33%	6.64%
Revolving Funding Facility
Line of Credit Facility [Line Items]
Average outstanding balance	$ 872	$ 863	$ 721	$ 847
Revolving Funding Facility | Line of Credit
Line of Credit Facility [Line Items]
Stated interest expense	17	16	41	44
Credit facility fees	1	1	5	4
Amortization of debt issuance costs	1	1	3	3
Interest and credit facility fees	19	18	49	51
Cash paid for interest expense	$ 16	$ 16	$ 42	$ 43
Average stated interest rate	7.34%	7.46%	7.42%	6.96%
SMBC Funding Facility
Line of Credit Facility [Line Items]
Average outstanding balance	$ 482	$ 401	$ 356	$ 414
SMBC Funding Facility | Line of Credit
Line of Credit Facility [Line Items]
Stated interest expense	10	7	22	21
Credit facility fees	0	1	2	2
Amortization of debt issuance costs	1	1	2	2
Interest and credit facility fees	11	9	26	25
Cash paid for interest expense	$ 9	$ 7	$ 21	$ 21
Average stated interest rate	7.80%	7.34%	8.11%	6.78%
BNP Funding Facility
Line of Credit Facility [Line Items]
Average outstanding balance	$ 623	$ 493	$ 587	$ 401
BNP Funding Facility | Line of Credit
Line of Credit Facility [Line Items]
Stated interest expense	12	10	35	23
Credit facility fees	1	0	1	1
Amortization of debt issuance costs	1	0	1	1
Interest and credit facility fees	14	10	37	25
Cash paid for interest expense	$ 11	$ 10	$ 34	$ 22
Average stated interest rate	7.52%	8.32%	7.76%	7.75%
2024-1 CLO Notes | Secured Debt
Line of Credit Facility [Line Items]
Stated interest expense	$ 9		$ 13
Amortization of debt issuance costs	0		0
Interest and credit facility fees	9		13
Cash paid for interest expense	$ 0		$ 0
Average stated interest rate	7.32%		7.26%
Average outstanding balance	$ 476		$ 226
Convertible Unsecured Notes | Convertible Debt
Line of Credit Facility [Line Items]
Stated interest expense	0	$ 5	3	$ 14
Net amortization of original issue premium/discount	0	1	0	2
Interest and credit facility fees	0	6	3	16
Cash paid for interest expense	$ 0	$ 0	$ 9	$ 9