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ALLOWANCE FOR CREDIT LOSSES - Narrative (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Jan. 01, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Allowance for loan losses disclosures          
Allowance for credit losses on loans, leases and unfunded lending commitments $ 19,873   $ 19,125 $ 18,326  
Allowance for credit losses on loans (ACLL) (18,145)   (16,974) (16,455) $ (24,956)
Allowance for credit losses on unfunded commitments (ACLUC) 1,728   2,151 1,871 2,655
Allowance for credit losses on HTM debt securities 95   120 87  
Cumulative effect of adoption          
Allowance for loan losses disclosures          
Allowance for credit losses on loans (ACLL)   $ 352 352    
Consumer          
Allowance for loan losses disclosures          
Allowance for credit losses on loans (ACLL) (15,431)   (14,119) (14,040) (20,180)
Consumer | Cumulative effect of adoption          
Allowance for loan losses disclosures          
Allowance for credit losses on loans (ACLL)     352    
Corporate          
Allowance for loan losses disclosures          
Allowance for credit losses on loans (ACLL) $ (2,714)   (2,855) $ (2,415) $ (4,776)
Corporate | Cumulative effect of adoption          
Allowance for loan losses disclosures          
Allowance for credit losses on loans (ACLL)     $ 0