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ALLOWANCE FOR CREDIT LOSSES, NONACCRUING LOANS AND LEASES, AND CONCENTRATIONS OF CREDIT RISK - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Financing Receivable, Troubled Debt Restructuring [Line Items]          
ACL Balance $ 2,100   $ 2,100   $ 2,700
Charge-offs     236    
Provision charged to income (213) $ 464 (353) $ 1,064  
Loans and leases 122,581   122,581   123,090
Mortgage loans collateralized by OREO 152   152   119
Commercial          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Charge-offs     30    
Loans and leases 59,083   59,083   60,793
Retail          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Charge-offs increase (decrease)     (78)    
Loans and leases 63,498   63,498   62,297
Commercial and industrial | Commercial          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Loans and leases 42,842   42,842   44,173
Collateral Dependent | Home Equity Loan And Residential Mortgages | Retail          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Loans and leases 554   554   552
Collateral Dependent | Commercial and industrial | Commercial          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Loans and leases $ 66   $ 66   $ 206