DEBT - Outstanding Debt (Details) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Debt Instrument [Line Items]
Aggregate Principal Amount Issued	$ 22,416	$ 21,578
Principal Amount Outstanding	15,474	16,012
Carrying Value	15,124	15,991
Revolving Credit Facility
Debt Instrument [Line Items]
Borrowing capacity increase under line of credit	8,222	7,925
SMBC Funding Facility
Debt Instrument [Line Items]
Borrowing capacity increase under line of credit	2,500	1,300
July 2038 CLO Notes
Debt Instrument [Line Items]
Principal Amount Outstanding	709
Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Aggregate Principal Amount Issued	5,481	5,493
Principal Amount Outstanding	1,261	2,028
Carrying Value	1,261	2,031
Line of Credit \| Revolving Funding Facility
Debt Instrument [Line Items]
Aggregate Principal Amount Issued	2,250	2,250
Principal Amount Outstanding	1,085	1,234
Carrying Value	1,085	1,234
Line of Credit \| SMBC Funding Facility
Debt Instrument [Line Items]
Aggregate Principal Amount Issued	1,600	1,100
Principal Amount Outstanding	775	563
Carrying Value	775	563
Line of Credit \| BNP Funding Facility
Debt Instrument [Line Items]
Aggregate Principal Amount Issued	1,465	1,265
Principal Amount Outstanding	733	717
Carrying Value	733	717
Secured debt \| April 2036 CLO Notes
Debt Instrument [Line Items]
Aggregate Principal Amount Issued	0	476
Principal Amount Outstanding	0	476
Carrying Value	0	473
Secured debt \| July 2038 CLO Notes
Debt Instrument [Line Items]
Aggregate Principal Amount Issued	476	0
Principal Amount Outstanding	476	0
Carrying Value	474	0
Secured debt \| October 2036 CLO Secured Loans
Debt Instrument [Line Items]
Aggregate Principal Amount Issued	544	544
Principal Amount Outstanding	544	544
Carrying Value	542	541
Secured debt \| January 2038 CLO Notes
Debt Instrument [Line Items]
Aggregate Principal Amount Issued	700	700
Principal Amount Outstanding	700	700
Carrying Value	697	697
Secured debt \| January 2026 Notes
Debt Instrument [Line Items]
Aggregate Principal Amount Issued	0
Principal Amount Outstanding	0
Carrying Value	0
Senior Notes \| January 2026 Notes
Debt Instrument [Line Items]
Aggregate Principal Amount Issued		1,150
Principal Amount Outstanding	0	1,150
Carrying Value		1,150
Senior Notes \| July 2026 Notes
Debt Instrument [Line Items]
Aggregate Principal Amount Issued	0	1,000
Principal Amount Outstanding	0	1,000
Carrying Value	0	999
Senior Notes \| January 2027 Notes
Debt Instrument [Line Items]
Aggregate Principal Amount Issued	900	900
Principal Amount Outstanding	900	900
Carrying Value	893	900
Senior Notes \| June 2027 Notes
Debt Instrument [Line Items]
Aggregate Principal Amount Issued	500	500
Principal Amount Outstanding	500	500
Carrying Value	499	498
Senior Notes \| June 2028 Notes
Debt Instrument [Line Items]
Aggregate Principal Amount Issued	1,250	1,250
Principal Amount Outstanding	1,250	1,250
Carrying Value	1,249	1,248
Senior Notes \| March 2029 Notes
Debt Instrument [Line Items]
Aggregate Principal Amount Issued	1,000	1,000
Principal Amount Outstanding	1,000	1,000
Carrying Value	965	999
Senior Notes \| July 2029 Notes
Debt Instrument [Line Items]
Aggregate Principal Amount Issued	850	850
Principal Amount Outstanding	850	850
Carrying Value	826	861
Senior Notes \| January 2030 Notes
Debt Instrument [Line Items]
Aggregate Principal Amount Issued	800	0
Principal Amount Outstanding	800	0
Carrying Value	765	0
Senior Notes \| September 2030 Notes
Debt Instrument [Line Items]
Aggregate Principal Amount Issued	750	750
Principal Amount Outstanding	750	750
Carrying Value	708	743
Senior Notes \| January 2031 Notes
Debt Instrument [Line Items]
Aggregate Principal Amount Issued	650	650
Principal Amount Outstanding	650	650
Carrying Value	602	634
Senior Notes \| April 2031 Notes
Debt Instrument [Line Items]
Aggregate Principal Amount Issued	750	0
Principal Amount Outstanding	750	0
Carrying Value	697	0
Senior Notes \| November 2031 Notes
Debt Instrument [Line Items]
Aggregate Principal Amount Issued	700	700
Principal Amount Outstanding	700	700
Carrying Value	694	693
Senior Notes \| March 2032 Notes
Debt Instrument [Line Items]
Aggregate Principal Amount Issued	1,000	1,000
Principal Amount Outstanding	1,000	1,000
Carrying Value	949	1,010
Senior Notes \| September 2033 Notes
Debt Instrument [Line Items]
Aggregate Principal Amount Issued	750	0
Principal Amount Outstanding	750	0
Carrying Value	$ 710	$ 0