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BROKERAGE RECEIVABLES AND BROKERAGE PAYABLES (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Brokers and Dealers [Abstract]    
Receivables from customers $ 16,208 $ 19,215
Receivables from brokers, dealers and clearing organizations 20,769 19,169
Total brokerage receivables 36,977 38,384
Payables to customers 40,408 38,741
Payables to brokers, dealers and clearing organizations 27,264 22,601
Total brokerage payables $ 67,672 $ 61,342