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Trading Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Trading Assets and Liabilities [Line Items]    
Trading debt securities $ 75,095 $ 79,733
Trading equity securities 23,032 27,440
Loans held for sale [1] 36,384 24,319
Gross derivative asset 65,682 39,326
Derivative assets 25,846 14,203
Trading assets 123,608 121,507
Short sales 22,441 17,430
Gross trading derivative liabilities 58,065 37,930
Derivative liabilities 16,509 9,079
Total trading liabilities 36,282 25,217
Held for trading [Member]    
Trading Assets and Liabilities [Line Items]    
Gross derivative asset 58,767 34,825
Netting (34,301) (21,463)
Derivative assets 24,466 13,362
Short sales 22,441 17,430
Gross trading derivative liabilities 53,285 33,861
Netting (39,444) (26,074)
Derivative liabilities 13,841 7,787
Held for trading [Member] | Loans held for sale [Member]    
Trading Assets and Liabilities [Line Items]    
Loans held for sale $ 1,015 $ 972
[1] In 2020, loans held for sale and mortgage loans held for sale were combined into a single line item, and mortgage servicing rights measured at fair value and at amortized cost were combined into a single line item. Prior period balances have been revised to conform with the current period presentation.