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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, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance $ 563 $ 634
Allowance on Impaired Loans 81 106
Impaired Loans Without a Related Allowance 640 589
Unpaid Contractual Balance 1,443 1,443
Total Recorded Investment in Impaired Loans 1,203 1,223
Commercial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 255 286
Allowance on Impaired Loans 46 63
Impaired Loans Without a Related Allowance 189 138
Unpaid Contractual Balance 530 475
Total Recorded Investment in Impaired Loans 444 424
Commercial | Commercial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 231 247
Allowance on Impaired Loans 45 55
Impaired Loans Without a Related Allowance 185 134
Unpaid Contractual Balance 491 431
Total Recorded Investment in Impaired Loans 416 381
Commercial | Commercial real estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 24 39
Allowance on Impaired Loans 1 8
Impaired Loans Without a Related Allowance 4 4
Unpaid Contractual Balance 39 44
Total Recorded Investment in Impaired Loans 28 43
Retail    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 308 348
Allowance on Impaired Loans 35 43
Impaired Loans Without a Related Allowance 451 451
Unpaid Contractual Balance 913 968
Total Recorded Investment in Impaired Loans 759 799
Retail | Residential mortgages    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 23 37
Allowance on Impaired Loans 2 2
Impaired Loans Without a Related Allowance 117 141
Unpaid Contractual Balance 185 235
Total Recorded Investment in Impaired Loans 140 178
Retail | Home equity loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 42 51
Allowance on Impaired Loans 4 3
Impaired Loans Without a Related Allowance 83 94
Unpaid Contractual Balance 167 191
Total Recorded Investment in Impaired Loans 125 145
Retail | Home equity lines of credit    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 16 23
Allowance on Impaired Loans 1 1
Impaired Loans Without a Related Allowance 181 173
Unpaid Contractual Balance 242 240
Total Recorded Investment in Impaired Loans 197 196
Retail | Home equity loans serviced by others    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 31 41
Allowance on Impaired Loans 2 4
Impaired Loans Without a Related Allowance 19 19
Unpaid Contractual Balance 60 70
Total Recorded Investment in Impaired Loans 50 60
Retail | Home equity lines of credit serviced by others    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 3 2
Allowance on Impaired Loans 0 0
Impaired Loans Without a Related Allowance 6 7
Unpaid Contractual Balance 13 13
Total Recorded Investment in Impaired Loans 9 9
Retail | Automobile    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 4 4
Allowance on Impaired Loans 0 0
Impaired Loans Without a Related Allowance 19 15
Unpaid Contractual Balance 30 25
Total Recorded Investment in Impaired Loans 23 19
Retail | Education    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 159 154
Allowance on Impaired Loans 18 25
Impaired Loans Without a Related Allowance 20 1
Unpaid Contractual Balance 179 155
Total Recorded Investment in Impaired Loans 179 155
Retail | Credit cards    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 25 26
Allowance on Impaired Loans 7 6
Impaired Loans Without a Related Allowance 1 0
Unpaid Contractual Balance 26 26
Total Recorded Investment in Impaired Loans 26 26
Retail | Other retail    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 5 10
Allowance on Impaired Loans 1 2
Impaired Loans Without a Related Allowance 5 1
Unpaid Contractual Balance 11 13
Total Recorded Investment in Impaired Loans $ 10 $ 11