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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, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance $ 537 $ 506
Allowance on Impaired Loans 86 81
Impaired Loans Without a Related Allowance 628 625
Unpaid Contractual Balance 1,407 1,364
Total Recorded Investment in Impaired Loans 1,165 1,131
Commercial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 268 208
Allowance on Impaired Loans 59 47
Impaired Loans Without a Related Allowance 162 162
Unpaid Contractual Balance 517 443
Total Recorded Investment in Impaired Loans 430 370
Commercial | Commercial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 237 183
Allowance on Impaired Loans 52 42
Impaired Loans Without a Related Allowance 133 159
Unpaid Contractual Balance 439 403
Total Recorded Investment in Impaired Loans 370 342
Commercial | Commercial real estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 31 25
Allowance on Impaired Loans 7 5
Impaired Loans Without a Related Allowance 29 3
Unpaid Contractual Balance 78 40
Total Recorded Investment in Impaired Loans 60 28
Commercial | Leases    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 0 0
Allowance on Impaired Loans 0 0
Impaired Loans Without a Related Allowance 0 0
Unpaid Contractual Balance 0 0
Total Recorded Investment in Impaired Loans 0 0
Retail    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 269 298
Allowance on Impaired Loans 27 34
Impaired Loans Without a Related Allowance 466 463
Unpaid Contractual Balance 890 921
Total Recorded Investment in Impaired Loans 735 761
Retail | Residential mortgages    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 28 25
Allowance on Impaired Loans 2 2
Impaired Loans Without a Related Allowance 128 126
Unpaid Contractual Balance 201 197
Total Recorded Investment in Impaired Loans 156 151
Retail | Home equity loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 34 41
Allowance on Impaired Loans 3 4
Impaired Loans Without a Related Allowance 72 80
Unpaid Contractual Balance 145 162
Total Recorded Investment in Impaired Loans 106 121
Retail | Home equity lines of credit    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 18 16
Allowance on Impaired Loans 1 1
Impaired Loans Without a Related Allowance 190 181
Unpaid Contractual Balance 253 241
Total Recorded Investment in Impaired Loans 208 197
Retail | Home equity loans serviced by others    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 23 29
Allowance on Impaired Loans 2 2
Impaired Loans Without a Related Allowance 20 22
Unpaid Contractual Balance 57 67
Total Recorded Investment in Impaired Loans 43 51
Retail | Home equity lines of credit serviced by others    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 2 2
Allowance on Impaired Loans 0 0
Impaired Loans Without a Related Allowance 7 7
Unpaid Contractual Balance 12 14
Total Recorded Investment in Impaired Loans 9 9
Retail | Automobile    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 2 2
Allowance on Impaired Loans 0 0
Impaired Loans Without a Related Allowance 23 21
Unpaid Contractual Balance 31 30
Total Recorded Investment in Impaired Loans 25 23
Retail | Education    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 134 154
Allowance on Impaired Loans 11 17
Impaired Loans Without a Related Allowance 23 21
Unpaid Contractual Balance 158 175
Total Recorded Investment in Impaired Loans 157 175
Retail | Credit cards    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 24 24
Allowance on Impaired Loans 7 7
Impaired Loans Without a Related Allowance 0 1
Unpaid Contractual Balance 25 25
Total Recorded Investment in Impaired Loans 24 25
Retail | Other retail    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 4 5
Allowance on Impaired Loans 1 1
Impaired Loans Without a Related Allowance 3 4
Unpaid Contractual Balance 8 10
Total Recorded Investment in Impaired Loans $ 7 $ 9