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Trading Assets and Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading assets $ 33,520 $ 16,850
Trading liabilities 4,084 4,908
U.S. Treasury [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading assets 4,250 3,560
US Government agency issued or guaranteed [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading assets 125 24
US Government sponsored enterprises [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading assets 213 222
Asset backed securities [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading assets 288 365
Corporate and foreign bonds [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading assets 6,130 6,481
Other securities [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading assets 12 15
Precious metals [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading assets 19,124 1,772
Trading liabilities 0 62
Securities sold, not yet purchased [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading liabilities 1,474 1,060
Derivatives [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading assets 3,378 4,411
Derivatives [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading liabilities $ 2,610 $ 3,786