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ALLOWANCE FOR CREDIT LOSSES - Narrative (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Allowance for loan losses disclosures            
Allowance for credit losses on loans, leases and unfunded lending commitments $ 19,435   $ 19,125 $ 18,398    
Allowance for credit losses 17,629 $ 17,496 16,974 16,309 $ 15,952 $ 16,455
Allowance for credit losses on unfunded commitments (ACLUC) 1,806 1,862 2,151 2,089 2,193 1,871
Allowance for credit losses on HTM debt securities 95   120 115    
Cumulative Effect, Period of Adoption, Adjustment            
Allowance for loan losses disclosures            
Allowance for credit losses   0 (352)   0 0
Consumer loans            
Allowance for loan losses disclosures            
Allowance for credit losses 14,912 14,866 14,119 13,361 12,983 14,040
Consumer loans | Cumulative Effect, Period of Adoption, Adjustment            
Allowance for loan losses disclosures            
Allowance for credit losses     (352)     0
Corporate loans            
Allowance for loan losses disclosures            
Allowance for credit losses $ 2,717 $ 2,630 2,855 $ 2,948 $ 2,969 2,415
Corporate loans | Cumulative Effect, Period of Adoption, Adjustment            
Allowance for loan losses disclosures            
Allowance for credit losses     $ 0     $ 0