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SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Municipal Securities Tender Option Bond Trusts (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
trust
Dec. 31, 2019
USD ($)
Variable Interest Entity    
Number of TOB trusts | trust 2  
Municipal bonds owned by trusts, that have credit guarantee provided by the Company $ 0 $ 0
Municipal securities tender option bond trusts (TOBs)    
Variable Interest Entity    
Liquidity agreements, customer TOB trust 1,600,000,000 3,500,000,000
Notional amount of offsetting reimbursement agreements 800,000,000 1,600,000,000
Liquidity agreements, other trusts $ 3,600,000,000 $ 7,000,000,000.0
Maximum | Municipal securities tender option bond trusts (TOBs)    
Variable Interest Entity    
The threshold ownership percentage on Residual value of customers TOBs for which the reimbursement agreement applied 25.00%