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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Impaired Loans by Class (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance $ 521 $ 506
Allowance on Impaired Loans 75 81
Impaired Loans Without a Related Allowance 630 625
Unpaid Contractual Balance 1,393 1,364
Total Recorded Investment in Impaired Loans 1,151 1,131
Commercial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 236 208
Allowance on Impaired Loans 47 47
Impaired Loans Without a Related Allowance 167 162
Unpaid Contractual Balance 487 443
Total Recorded Investment in Impaired Loans 403 370
Commercial | Commercial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 211 183
Allowance on Impaired Loans 42 42
Impaired Loans Without a Related Allowance 167 159
Unpaid Contractual Balance 447 403
Total Recorded Investment in Impaired Loans 378 342
Commercial | Commercial real estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 25 25
Allowance on Impaired Loans 5 5
Impaired Loans Without a Related Allowance 0 3
Unpaid Contractual Balance 40 40
Total Recorded Investment in Impaired Loans 25 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 285 298
Allowance on Impaired Loans 28 34
Impaired Loans Without a Related Allowance 463 463
Unpaid Contractual Balance 906 921
Total Recorded Investment in Impaired Loans 748 761
Retail | Residential mortgages    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 27 25
Allowance on Impaired Loans 2 2
Impaired Loans Without a Related Allowance 124 126
Unpaid Contractual Balance 197 197
Total Recorded Investment in Impaired Loans 151 151
Retail | Home equity loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 38 41
Allowance on Impaired Loans 3 4
Impaired Loans Without a Related Allowance 78 80
Unpaid Contractual Balance 156 162
Total Recorded Investment in Impaired Loans 116 121
Retail | Home equity lines of credit    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 16 16
Allowance on Impaired Loans 1 1
Impaired Loans Without a Related Allowance 182 181
Unpaid Contractual Balance 242 241
Total Recorded Investment in Impaired Loans 198 197
Retail | Home equity loans serviced by others    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 28 29
Allowance on Impaired Loans 2 2
Impaired Loans Without a Related Allowance 22 22
Unpaid Contractual Balance 65 67
Total Recorded Investment in Impaired Loans 50 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 13 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 22 21
Unpaid Contractual Balance 30 30
Total Recorded Investment in Impaired Loans 24 23
Retail | Education    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 144 154
Allowance on Impaired Loans 12 17
Impaired Loans Without a Related Allowance 25 21
Unpaid Contractual Balance 169 175
Total Recorded Investment in Impaired Loans 169 175
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 9 10
Total Recorded Investment in Impaired Loans $ 7 $ 9