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DEBT - Outstanding Debt (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Aggregate principal amount of unsecured notes	$ 20,878	$ 18,948
Principal Amount Outstanding	15,615	13,789
Carrying Value	15,605	13,727
Carrying value
Debt Instrument [Line Items]
Fair value disclosures of long-term debt	15,605	13,727
Revolving Credit Facility
Debt Instrument [Line Items]
Borrowing capacity increase under line of credit	7,925	6,732
SMBC Funding Facility
Debt Instrument [Line Items]
Borrowing capacity increase under line of credit	1,300	1,000
April 2036 CLO Notes
Debt Instrument [Line Items]
Principal Amount Outstanding	702
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Aggregate principal amount of unsecured notes	5,493	4,513
Principal Amount Outstanding	2,293	1,113
Carrying Value	2,293	1,113
Line of Credit | Revolving Funding Facility
Debt Instrument [Line Items]
Aggregate principal amount of unsecured notes	2,250	2,150
Principal Amount Outstanding	1,239	1,065
Carrying Value	1,239	1,065
Line of Credit | SMBC Funding Facility
Debt Instrument [Line Items]
Aggregate principal amount of unsecured notes	1,100	800
Principal Amount Outstanding	539	502
Carrying Value	539	502
Line of Credit | SMBC Funding Facility | Carrying value
Debt Instrument [Line Items]
Fair value disclosures of long-term debt	539
Line of Credit | BNP Funding Facility
Debt Instrument [Line Items]
Aggregate principal amount of unsecured notes	1,265	1,265
Principal Amount Outstanding	774	889
Carrying Value	774	889
Line of Credit | BNP Funding Facility | Carrying value
Debt Instrument [Line Items]
Fair value disclosures of long-term debt	774
Secured Debt | April 2036 CLO Notes
Debt Instrument [Line Items]
Aggregate principal amount of unsecured notes	476	476
Principal Amount Outstanding	476	476
Carrying Value		473
Secured Debt | April 2036 CLO Notes | Carrying value
Debt Instrument [Line Items]
Carrying Value	474
Secured Debt | October 2036 CLO Secured Loans
Debt Instrument [Line Items]
Aggregate principal amount of unsecured notes	544	544
Principal Amount Outstanding	544	544
Carrying Value		541
Secured Debt | October 2036 CLO Secured Loans | Carrying value
Debt Instrument [Line Items]
Carrying Value	541
Senior Notes | March 2025 Notes
Debt Instrument [Line Items]
Aggregate principal amount of unsecured notes	0	600
Principal Amount Outstanding	0	600
Carrying Value	0	600
Senior Notes | March 2025 Notes | Carrying value
Debt Instrument [Line Items]
Fair value disclosures of long-term debt	0	600
Senior Notes | July 2025 Notes
Debt Instrument [Line Items]
Aggregate principal amount of unsecured notes	0	1,250
Principal Amount Outstanding	0	1,250
Carrying Value	0	1,252
Senior Notes | July 2025 Notes | Carrying value
Debt Instrument [Line Items]
Fair value disclosures of long-term debt	0	1,252
Senior Notes | January 2026 Notes
Debt Instrument [Line Items]
Aggregate principal amount of unsecured notes	1,150	1,150
Principal Amount Outstanding	1,150	1,150
Carrying Value	1,149	1,148
Senior Notes | January 2026 Notes | Carrying value
Debt Instrument [Line Items]
Fair value disclosures of long-term debt	1,149	1,148
Senior Notes | July 2026 Notes
Debt Instrument [Line Items]
Aggregate principal amount of unsecured notes	1,000	1,000
Principal Amount Outstanding	1,000	1,000
Carrying Value	998	996
Senior Notes | July 2026 Notes | Carrying value
Debt Instrument [Line Items]
Fair value disclosures of long-term debt	998	996
Senior Notes | January 2027 Notes
Debt Instrument [Line Items]
Aggregate principal amount of unsecured notes	900	900
Principal Amount Outstanding	900	900
Carrying Value	901	891
Senior Notes | January 2027 Notes | Carrying value
Debt Instrument [Line Items]
Fair value disclosures of long-term debt	901	891
Senior Notes | June 2027 Notes
Debt Instrument [Line Items]
Aggregate principal amount of unsecured notes	500	500
Principal Amount Outstanding	500	500
Carrying Value	498	497
Senior Notes | June 2027 Notes | Carrying value
Debt Instrument [Line Items]
Fair value disclosures of long-term debt	498	497
Senior Notes | June 2028 Notes
Debt Instrument [Line Items]
Aggregate principal amount of unsecured notes	1,250	1,250
Principal Amount Outstanding	1,250	1,250
Carrying Value	1,248	1,248
Senior Notes | June 2028 Notes | Carrying value
Debt Instrument [Line Items]
Fair value disclosures of long-term debt	1,248	1,248
Senior Notes | March 2029 Notes
Debt Instrument [Line Items]
Aggregate principal amount of unsecured notes	1,000	1,000
Principal Amount Outstanding	1,000	1,000
Carrying Value	1,000	985
Senior Notes | March 2029 Notes | Carrying value
Debt Instrument [Line Items]
Fair value disclosures of long-term debt	1,000	985
Senior Notes | July 2029 Notes
Debt Instrument [Line Items]
Aggregate principal amount of unsecured notes	850	850
Principal Amount Outstanding	850	850
Carrying Value	862	835
Senior Notes | July 2029 Notes | Carrying value
Debt Instrument [Line Items]
Fair value disclosures of long-term debt	862	835
Senior Notes | September 2030 Notes
Debt Instrument [Line Items]
Aggregate principal amount of unsecured notes	750	0
Principal Amount Outstanding	750	0
Carrying Value		0
Senior Notes | September 2030 Notes | Carrying value
Debt Instrument [Line Items]
Carrying Value	744
Fair value disclosures of long-term debt		0
Senior Notes | January 2031 Notes
Debt Instrument [Line Items]
Aggregate principal amount of unsecured notes	650	0
Principal Amount Outstanding	650	0
Carrying Value	636	0
Senior Notes | January 2031 Notes | Carrying value
Debt Instrument [Line Items]
Fair value disclosures of long-term debt	636	0
Senior Notes | November 2031 Notes
Debt Instrument [Line Items]
Aggregate principal amount of unsecured notes	700	700
Principal Amount Outstanding	700	700
Carrying Value	693	692
Senior Notes | November 2031 Notes | Carrying value
Debt Instrument [Line Items]
Fair value disclosures of long-term debt	693	692
Senior Notes | March 2032 Notes
Debt Instrument [Line Items]
Aggregate principal amount of unsecured notes	1,000	0
Principal Amount Outstanding	1,000	0
Carrying Value		0
Senior Notes | March 2032 Notes | Carrying value
Debt Instrument [Line Items]
Fair value disclosures of long-term debt	$ 1,016	$ 0

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