REVENUES - Schedule of Interest Revenue Earned and Interest Expense Paid from Fully-paid Securities Lending (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Total net interest revenues	$ 456	$ 274	$ 1,103	$ 813
Fully-Paid Securities Lending
Disaggregation of Revenue [Line Items]
Interest revenue	52	20	116	60
Interest expense	(8)	(3)	(18)	(9)
Total net interest revenues	$ 44	$ 17	$ 98	$ 51