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ALLOWANCE FOR CREDIT LOSSES, NONACCRUAL LOANS AND LEASES, AND CONCENTRATIONS OF CREDIT RISK - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Jan. 01, 2020
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Retained earnings   $ (9,159) $ (7,978)  
Income tax expense   (582) (658) $ (241)
Allowance for credit losses   306    
Net charge-offs   270 325 693
ACL on PCD loans and leases and unfunded lending commitments at acquisition   102    
Provision (benefit) for credit losses   474 (411) 1,616
Loans and leases   156,662 128,163  
Mortgage loans collateralized by residential real estate property   250 142  
Charge-offs   434 539 843
Unfunded commitments related to TDRs   81 56  
Troubled Debt Restructuring        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Charge-offs   3 6 51
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Retained earnings $ 337      
Income tax expense 114      
Allowance for credit losses $ 451      
Commercial        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Allowance for credit losses, individually evaluated for impairment   5    
Net charge-offs   52 164 425
Loans and leases   82,180 60,350  
Charge-offs   70 218 437
Retail        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Net charge-offs   218 161 268
Loans and leases   74,482 67,813  
Charge-offs   364 321 $ 406
Commercial and industrial | Commercial        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Loans and leases   51,836 44,500  
Collateral Dependent | Home Equity Loan And Residential Mortgages | Retail        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Loans and leases   561 542  
Collateral Dependent | Commercial and industrial | Commercial        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Loans and leases   $ 21 $ 103