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Receivables from and Payables to Brokers, Dealers and Clearing Organizations (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Receivables from Brokers-Dealers and Clearing Organizations [Abstract]    
Securities Borrowed $ 740 $ 774
Receivables from Clearing Organizations 376 231
Other 62 51
Receivables from brokers, dealers and clearing organizations 1,178 1,056
Payables to Broker-Dealers and Clearing Organizations [Abstract]    
Securities Loaned 1,373 926
Payables to Clearing Organizations 123 7
Other 46 50
Payables to brokers, dealers and clearing organizations $ 1,542 $ 983