SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Municipal Securities Tender Option Bond Trusts (Details) - Municipal securities tender option bond trusts (TOBs) - USD ($) $ in Billions	6 Months Ended
	Jun. 30, 2023	Dec. 31, 2022
Variable Interest Entity
Liquidity agreements, customer TOB trust	$ 0.7	$ 1.1
Notional amount of offsetting reimbursement agreements	0.5	0.7
Liquidity agreements, other trusts	$ 1.4	$ 1.4
Maximum
Variable Interest Entity
The threshold ownership percentage on Residual value of customers TOBs for which the reimbursement agreement applied	25.00%