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Trading Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Debt and Equity Securities, FV-NI [Line Items]    
Trading assets $ 28,452 $ 21,978
Trading liabilities 3,235 3,643
U.S. Treasury [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Trading assets 6,763 5,368
US Government agency issued or guaranteed [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Trading assets 18 111
US Government-sponsored enterprises [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Trading assets 20 41
Asset-backed securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Trading assets 168 208
Corporate and foreign bonds [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Trading assets 10,826 10,562
Equity securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Trading assets 5,693 751
Precious metals [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Trading assets 1,909 1,889
Trading liabilities 124 215
Securities sold, not yet purchased [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Trading liabilities 1,182 738
Derivatives, net [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Trading assets 3,055 3,048
Derivatives, net [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Trading liabilities $ 1,929 $ 2,690