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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Impaired Loans by Class (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Financing Receivable, Past Due [Line Items]    
Impaired Loans With a Related Allowance $ 482 $ 483
Allowance on Impaired Loans 99 64
Impaired Loans Without a Related Allowance 580 631
Unpaid Contractual Balance 1,271 1,363
Total Recorded Investment in Impaired Loans 1,062 1,114
Commercial    
Financing Receivable, Past Due [Line Items]    
Impaired Loans With a Related Allowance 241 218
Allowance on Impaired Loans 74 38
Impaired Loans Without a Related Allowance 146 173
Unpaid Contractual Balance 452 488
Total Recorded Investment in Impaired Loans 387 391
Commercial | Commercial    
Financing Receivable, Past Due [Line Items]    
Impaired Loans With a Related Allowance 194 186
Allowance on Impaired Loans 62 31
Impaired Loans Without a Related Allowance 127 167
Unpaid Contractual Balance 376 450
Total Recorded Investment in Impaired Loans 321 353
Commercial | Commercial real estate    
Financing Receivable, Past Due [Line Items]    
Impaired Loans With a Related Allowance 47 32
Allowance on Impaired Loans 12 7
Impaired Loans Without a Related Allowance 19 6
Unpaid Contractual Balance 76 38
Total Recorded Investment in Impaired Loans 66 38
Retail    
Financing Receivable, Past Due [Line Items]    
Impaired Loans With a Related Allowance 241 265
Allowance on Impaired Loans 25 26
Impaired Loans Without a Related Allowance 434 458
Unpaid Contractual Balance 819 875
Total Recorded Investment in Impaired Loans 675 723
Retail | Residential mortgages    
Financing Receivable, Past Due [Line Items]    
Impaired Loans With a Related Allowance 25 28
Allowance on Impaired Loans 2 2
Impaired Loans Without a Related Allowance 122 127
Unpaid Contractual Balance 191 201
Total Recorded Investment in Impaired Loans 147 155
Retail | Home equity loans    
Financing Receivable, Past Due [Line Items]    
Impaired Loans With a Related Allowance 23 34
Allowance on Impaired Loans 1 3
Impaired Loans Without a Related Allowance 69 76
Unpaid Contractual Balance 126 148
Total Recorded Investment in Impaired Loans 92 110
Retail | Home equity lines of credit    
Financing Receivable, Past Due [Line Items]    
Impaired Loans With a Related Allowance 26 21
Allowance on Impaired Loans 2 1
Impaired Loans Without a Related Allowance 176 181
Unpaid Contractual Balance 243 244
Total Recorded Investment in Impaired Loans 202 202
Retail | Home equity loans serviced by others    
Financing Receivable, Past Due [Line Items]    
Impaired Loans With a Related Allowance 18 22
Allowance on Impaired Loans 1 1
Impaired Loans Without a Related Allowance 16 19
Unpaid Contractual Balance 44 54
Total Recorded Investment in Impaired Loans 34 41
Retail | Home equity lines of credit serviced by others    
Financing Receivable, Past Due [Line Items]    
Impaired Loans With a Related Allowance 1 1
Allowance on Impaired Loans 0 0
Impaired Loans Without a Related Allowance 6 7
Unpaid Contractual Balance 10 11
Total Recorded Investment in Impaired Loans 7 8
Retail | Automobile    
Financing Receivable, Past Due [Line Items]    
Impaired Loans With a Related Allowance 1 1
Allowance on Impaired Loans 0 0
Impaired Loans Without a Related Allowance 20 22
Unpaid Contractual Balance 30 31
Total Recorded Investment in Impaired Loans 21 23
Retail | Education    
Financing Receivable, Past Due [Line Items]    
Impaired Loans With a Related Allowance 117 130
Allowance on Impaired Loans 9 11
Impaired Loans Without a Related Allowance 22 23
Unpaid Contractual Balance 139 153
Total Recorded Investment in Impaired Loans 139 153
Retail | Credit cards    
Financing Receivable, Past Due [Line Items]    
Impaired Loans With a Related Allowance 27 24
Allowance on Impaired Loans 9 7
Impaired Loans Without a Related Allowance 1 1
Unpaid Contractual Balance 29 25
Total Recorded Investment in Impaired Loans 28 25
Retail | Other retail    
Financing Receivable, Past Due [Line Items]    
Impaired Loans With a Related Allowance 3 4
Allowance on Impaired Loans 1 1
Impaired Loans Without a Related Allowance 2 2
Unpaid Contractual Balance 7 8
Total Recorded Investment in Impaired Loans $ 5 $ 6