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ALLOWANCE FOR CREDIT LOSSES - Allowance for Credit Losses Roll Forward by Segment (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Jan. 01, 2023
Allowance for credit losses        
Adjusted ACLL at beginning of year $ 16,974 $ 16,455 $ 24,956  
Gross credit losses on loans (7,881) (5,156) (6,720)  
Gross recoveries on loans 1,444 1,367 1,825  
Replenishment of NCLs 6,437 3,789 4,895  
Net reserve builds (releases) for loans 1,272 937 (7,283)  
Net specific reserve builds (releases) 77 19 (715)  
Other 174 (437) (503)  
ACLL at end of year 18,145 16,974 16,455  
Allowance for credit losses on loans        
Collectively evaluated 17,743 16,053    
Individually evaluated 402 919    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 18,145 16,974 16,455  
Loans, net of unearned income        
Collectively evaluated 679,713 647,704    
Individually evaluated 1,940 4,043    
Loans held at fair value 7,594 5,360    
Total 689,362 657,221    
Purchased credit deteriorated        
Allowance for credit losses on loans        
Purchased credit deteriorated 0 2    
Loans, net of unearned income        
Purchased credit deteriorated 115 114    
Corporate        
Allowance for credit losses        
Adjusted ACLL at beginning of year 2,855 2,415 4,776  
Gross credit losses on loans (328) (278) (500)  
Gross recoveries on loans 78 100 114  
Replenishment of NCLs 250 178 386  
Net reserve builds (releases) for loans (168) 374 (2,075)  
Net specific reserve builds (releases) 39 65 (255)  
Other (12) 1 (31)  
ACLL at end of year 2,714 2,855 2,415  
Allowance for credit losses on loans        
Collectively evaluated 2,352 2,532    
Individually evaluated 362 323    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 2,714 2,855 2,415  
Loans, net of unearned income        
Collectively evaluated 291,002 282,909    
Individually evaluated 1,882 1,122    
Loans held at fair value 7,281 5,123    
Total 300,165 289,154    
Corporate | Purchased credit deteriorated        
Allowance for credit losses on loans        
Purchased credit deteriorated 0 0    
Loans, net of unearned income        
Purchased credit deteriorated 0 0    
Consumer        
Allowance for credit losses        
Adjusted ACLL at beginning of year 14,119 14,040 20,180  
Gross credit losses on loans (7,553) (4,878) (6,220)  
Gross recoveries on loans 1,366 1,267 1,711  
Replenishment of NCLs 6,187 3,611 4,509  
Net reserve builds (releases) for loans 1,440 563 (5,208)  
Net specific reserve builds (releases) 38 (46) (460)  
Other 186 (438) (472)  
ACLL at end of year 15,431 14,119 14,040  
Allowance for credit losses on loans        
Collectively evaluated 15,391 13,521    
Individually evaluated 40 596    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 15,431 14,119 $ 14,040  
Loans, net of unearned income        
Collectively evaluated 388,711 364,795    
Individually evaluated 58 2,921    
Loans held at fair value 313 237    
Total 389,197 368,067    
Consumer | Purchased credit deteriorated        
Allowance for credit losses on loans        
Purchased credit deteriorated 0 2    
Loans, net of unearned income        
Purchased credit deteriorated 115 114    
Cumulative effect of adoption        
Allowance for credit losses        
Adjusted ACLL at beginning of year (352)      
ACLL at end of year   (352)    
Allowance for credit losses on loans        
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest   (352)   $ (352)
Cumulative effect of adoption | Corporate        
Allowance for credit losses        
Adjusted ACLL at beginning of year 0      
ACLL at end of year   0    
Allowance for credit losses on loans        
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest   0    
Cumulative effect of adoption | Consumer        
Allowance for credit losses        
Adjusted ACLL at beginning of year (352)      
ACLL at end of year   (352)    
Allowance for credit losses on loans        
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest   (352)    
Adjusted balance        
Allowance for credit losses        
Adjusted ACLL at beginning of year 16,622      
ACLL at end of year   16,622    
Allowance for credit losses on loans        
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest   16,622    
Adjusted balance | Corporate        
Allowance for credit losses        
Adjusted ACLL at beginning of year 2,855      
ACLL at end of year   2,855    
Allowance for credit losses on loans        
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest   2,855    
Adjusted balance | Consumer        
Allowance for credit losses        
Adjusted ACLL at beginning of year $ 13,767      
ACLL at end of year   13,767    
Allowance for credit losses on loans        
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest   $ 13,767