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ALLOWANCE FOR CREDIT LOSSES - Allowance for Credit Losses Roll Forward by Segment (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Jan. 01, 2023
Allowance for credit losses        
Allowance for credit losses on loans (ACLL) at beginning of period $ 18,145 $ 16,974    
Charge-offs (2,690) (1,634)    
Recoveries 387 332    
Replenishment of NCLs 2,303 1,302    
Net reserve builds (releases) 246 397    
Net specific reserve builds (releases) (127) 38    
Other 32 112    
ACLL at end of period 18,296 17,169    
ACLL        
Collectively evaluated 18,023   $ 17,743  
Individually evaluated 273   402  
Total ACLL 18,296 17,169 18,145  
Loans, net of unearned income        
Collectively evaluated 664,040   679,713  
Individually evaluated 1,569   1,940  
Held at fair value 8,854   7,594  
Total loans, net of unearned income 674,578   689,362  
Cumulative Effect, Period of Adoption, Adjustment        
Allowance for credit losses        
Allowance for credit losses on loans (ACLL) at beginning of period   (352)    
ACLL        
Total ACLL       $ (352)
Cumulative Effect, Period of Adoption, Adjusted Balance        
Allowance for credit losses        
Allowance for credit losses on loans (ACLL) at beginning of period 18,145 16,622    
ACLL        
Total ACLL     18,145  
Purchased credit deteriorated        
ACLL        
Purchased credit deteriorated 0   0  
Loans, net of unearned income        
Purchased credit deteriorated 115   115  
Corporate loans        
Allowance for credit losses        
Allowance for credit losses on loans (ACLL) at beginning of period 2,714 2,855    
Charge-offs (178) (39)    
Recoveries 14 17    
Replenishment of NCLs 164 22    
Net reserve builds (releases) 188 (90)    
Net specific reserve builds (releases) (131) 5    
Other 1 10    
ACLL at end of period 2,772 2,780    
ACLL        
Collectively evaluated 2,542   2,352  
Individually evaluated 230   362  
Total ACLL 2,772 2,780 2,714  
Loans, net of unearned income        
Collectively evaluated 282,779   291,002  
Individually evaluated 1,489   1,882  
Held at fair value 8,551   7,281  
Total loans, net of unearned income 292,819   300,165  
Corporate loans | Cumulative Effect, Period of Adoption, Adjustment        
Allowance for credit losses        
Allowance for credit losses on loans (ACLL) at beginning of period   0    
ACLL        
Total ACLL        
Corporate loans | Cumulative Effect, Period of Adoption, Adjusted Balance        
Allowance for credit losses        
Allowance for credit losses on loans (ACLL) at beginning of period   2,855    
ACLL        
Total ACLL        
Corporate loans | Purchased credit deteriorated        
ACLL        
Purchased credit deteriorated 0   0  
Loans, net of unearned income        
Purchased credit deteriorated 0   0  
Consumer loans        
Allowance for credit losses        
Allowance for credit losses on loans (ACLL) at beginning of period 15,431 14,119    
Charge-offs (2,512) (1,595)    
Recoveries 373 315    
Replenishment of NCLs 2,139 1,280    
Net reserve builds (releases) 58 487    
Net specific reserve builds (releases) 4 33    
Other 31 102    
ACLL at end of period 15,524 14,389    
ACLL        
Collectively evaluated 15,481   15,391  
Individually evaluated 43   40  
Total ACLL 15,524 14,389 15,431  
Loans, net of unearned income        
Collectively evaluated 381,261   388,711  
Individually evaluated 80   58  
Held at fair value 303   313  
Total loans, net of unearned income 381,759   389,197  
Consumer loans | Cumulative Effect, Period of Adoption, Adjustment        
Allowance for credit losses        
Allowance for credit losses on loans (ACLL) at beginning of period   (352)    
ACLL        
Total ACLL        
Consumer loans | Cumulative Effect, Period of Adoption, Adjusted Balance        
Allowance for credit losses        
Allowance for credit losses on loans (ACLL) at beginning of period   $ 13,767    
ACLL        
Total ACLL        
Consumer loans | Purchased credit deteriorated        
ACLL        
Purchased credit deteriorated 0   0  
Loans, net of unearned income        
Purchased credit deteriorated $ 115   $ 115