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Receivables from and Payables to Brokers, Dealers and Clearing Organizations (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Receivables from Brokers-Dealers and Clearing Organizations [Abstract]    
Securities Borrowed $ 1,003 $ 140
Receivables from Clearing Organizations 297 555
Other 95 65
Receivables from brokers, dealers and clearing organizations 1,395 760
Broker-Dealer, Payable to Other Broker-Dealer and Clearing Organization [Abstract]    
Securities Loaned 838 887
Payables to Clearing Organizations 10 11
Other 45 50
Payables to brokers, dealers and clearing organizations $ 893 $ 948