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ALLOWANCE FOR CREDIT LOSSES, NONACCRUING LOANS AND LEASES, AND CONCENTRATIONS OF CREDIT RISK - Loans with Indicators of High Credit Risk (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
High loan-to-value    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total $ 265 $ 353
High loan-to-value | Residential Mortgages    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 224 289
High loan-to-value | Home Equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 41 64
High loan-to-value | Other Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 0 0
Interest-only    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 2,936 2,801
Interest-only | Residential Mortgages    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 2,936 2,801
Interest-only | Home Equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 0 0
Interest-only | Other Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 0 0
Low introductory rate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 145 170
Low introductory rate | Residential Mortgages    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 0 0
Low introductory rate | Home Equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 0 0
Low introductory rate | Other Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 145 170
Multiple characteristics and other    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 2  
Multiple characteristics and other | Residential Mortgages    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 2  
Multiple characteristics and other | Home Equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 0  
Multiple characteristics and other | Other Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 0  
Credit risk, loans with increased credit exposure    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 3,348 3,324
Credit risk, loans with increased credit exposure | Residential Mortgages    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 3,162 3,090
Credit risk, loans with increased credit exposure | Home Equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 41 64
Credit risk, loans with increased credit exposure | Other Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total $ 145 $ 170