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SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Municipal Securities Tender Option Bond Trusts (Details) - USD ($)
$ in Billions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Client intermediation          
Variable Interest Entity          
Proceeds from new securitizations $ 0.2 $ 0.2 $ 0.7 $ 0.9  
Municipal securities tender option bond trusts (TOBs)          
Variable Interest Entity          
Liquidity agreements, customer TOB trust 4.1   4.1   $ 3.2
Notional amount of offsetting reimbursement agreements 2.2   2.2   2.0
Liquidity agreements, other trusts $ 6.1   $ 6.1   $ 6.1
Municipal securities tender option bond trusts (TOBs) | Maximum          
Variable Interest Entity          
The threshold ownership percentage on Residual value of customers TOBs for which the reimbursement agreement applied     25.00%