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LOANS - Corporate Loans (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Loans    
Loans, net of unearned income $ 667,767 $ 675,883
Lease financing    
Loans    
Loans, net of unearned income 500 700
Corporate    
Loans    
Loans, net of unearned income 291,233 289,409
Unearned income (770) (787)
Loans sold and/or reclassified to held-for-sale 5,900 2,200
Corporate | Commercial and industrial    
Loans    
Loans, net of unearned income 147,004 151,700
Corporate | Financial institutions    
Loans    
Loans, net of unearned income 71,767 64,051
Corporate | Mortgage and real estate    
Loans    
Loans, net of unearned income 20,291 21,743
Corporate | Lease financing    
Loans    
Loans, net of unearned income 455 738
In U.S. offices | Corporate    
Loans    
Loans, net of unearned income 134,691 127,877
In U.S. offices | Corporate | Commercial and industrial    
Loans    
Loans, net of unearned income 48,364 53,930
In U.S. offices | Corporate | Financial institutions    
Loans    
Loans, net of unearned income 49,804 39,390
In U.S. offices | Corporate | Mortgage and real estate    
Loans    
Loans, net of unearned income 15,965 16,522
In U.S. offices | Corporate | Installment and other    
Loans    
Loans, net of unearned income 20,143 17,362
In U.S. offices | Corporate | Lease financing    
Loans    
Loans, net of unearned income 415 673
In offices outside the U.S. | Corporate    
Loans    
Loans, net of unearned income 156,542 161,532
In offices outside the U.S. | Corporate | Commercial and industrial    
Loans    
Loans, net of unearned income 102,735 103,234
In offices outside the U.S. | Corporate | Financial institutions    
Loans    
Loans, net of unearned income 22,158 25,111
In offices outside the U.S. | Corporate | Mortgage and real estate    
Loans    
Loans, net of unearned income 4,374 5,277
In offices outside the U.S. | Corporate | Installment and other    
Loans    
Loans, net of unearned income 22,812 24,034
In offices outside the U.S. | Corporate | Lease financing    
Loans    
Loans, net of unearned income 40 65
In offices outside the U.S. | Corporate | Government and official institutions    
Loans    
Loans, net of unearned income $ 4,423 $ 3,811