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Trading Assets and Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Debt and Equity Securities, FV-NI [Line Items]    
Trading assets $ 25,559 $ 16,150
Trading liabilities 3,277 4,879
U.S. Treasury [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Trading assets 4,733 3,391
US Government agency issued or guaranteed [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Trading assets 114 122
US Government-sponsored Enterprises Debt Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Trading assets 27 210
Asset-backed Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Trading assets 240 236
Corporate and foreign bonds [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Trading assets 7,687 6,180
Other securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Trading assets 0 12
Precious metals [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Trading assets 9,212 2,274
Trading liabilities 0 524
Securities sold, not yet purchased [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Trading liabilities 982 1,722
Derivatives [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Trading assets 3,546 3,725
Derivatives [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Trading liabilities $ 2,295 $ 2,633