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Trading Assets and Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Debt and Equity Securities, FV-NI [Line Items]    
Trading assets $ 33,754 $ 28,452
Trading liabilities 3,517 3,235
U.S. Treasury [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Trading assets 5,603 6,763
US Government agency issued or guaranteed [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Trading assets 16 18
US Government-sponsored enterprises [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Trading assets 177 20
Asset-backed securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Trading assets 147 168
Corporate and foreign bonds [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Trading assets 9,190 10,826
Equity securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Trading assets 6,169 5,693
Precious metals [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Trading assets 9,536 1,909
Trading liabilities 0 124
Securities sold, not yet purchased [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Trading liabilities 695 1,182
Derivatives, net [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Trading assets 2,916 3,055
Derivatives, net [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Trading liabilities $ 2,822 $ 1,929