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ALLOWANCE FOR CREDIT LOSSES - Narrative (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Jan. 01, 2023
Dec. 31, 2022
Allowance for loan losses disclosures          
Allowance for credit losses on loans, leases and unfunded lending commitments $ 19,925 $ 19,873 $ 19,128    
Allowance for credit losses 18,296 18,145 17,169   $ 16,974
Allowance for credit losses on unfunded commitments (ACLUC) 1,629 1,728 1,959   2,151
Allowance for credit losses on HTM debt securities 106 95      
Cumulative Effect, Period of Adoption, Adjustment          
Allowance for loan losses disclosures          
Allowance for credit losses       $ (352) (352)
Consumer loans          
Allowance for loan losses disclosures          
Allowance for credit losses 15,524 15,431 14,389   14,119
Consumer loans | Cumulative Effect, Period of Adoption, Adjustment          
Allowance for loan losses disclosures          
Allowance for credit losses         (352)
Corporate loans          
Allowance for loan losses disclosures          
Allowance for credit losses $ 2,772 $ 2,714 $ 2,780   2,855
Corporate loans | Cumulative Effect, Period of Adoption, Adjustment          
Allowance for loan losses disclosures          
Allowance for credit losses         $ 0