SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Loan Delinquencies and Liquidation Losses (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Residential
Variable Interest Entity
Securitized assets	$ 31,100.0		$ 31,000.0
Liquidation losses	0.0	$ 700.0
Commercial and other
Variable Interest Entity
Securitized assets	31,100.0		31,100.0
Liquidation losses	0.0	0.0
Mortgage securitizations - Non-agency-sponsored
Variable Interest Entity
Securitized assets	62,200.0		62,100.0
Liquidation losses	0.0	$ 700.0
Personal loan
Variable Interest Entity
Securitized assets	100.0
90+ days past due | Residential
Variable Interest Entity
Securitized assets	300.0		300.0
90+ days past due | Commercial and other
Variable Interest Entity
Securitized assets	0.0		0.0
90+ days past due | Mortgage securitizations - Non-agency-sponsored
Variable Interest Entity
Securitized assets	$ 300.0		$ 300.0