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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Impaired Loans by Class (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance $ 595 $ 634
Allowance on Impaired Loans 85 106
Impaired Loans Without a Related Allowance 700 589
Unpaid Contractual Balance 1,547 1,443
Total Recorded Investment in Impaired Loans 1,295 1,223
Commercial Banking    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 251 286
Allowance on Impaired Loans 42 63
Impaired Loans Without a Related Allowance 240 138
Unpaid Contractual Balance 566 475
Total Recorded Investment in Impaired Loans 491 424
Commercial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 216 247
Allowance on Impaired Loans 31 55
Impaired Loans Without a Related Allowance 237 134
Unpaid Contractual Balance 527 431
Total Recorded Investment in Impaired Loans 453 381
Commercial real estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 35 39
Allowance on Impaired Loans 11 8
Impaired Loans Without a Related Allowance 3 4
Unpaid Contractual Balance 39 44
Total Recorded Investment in Impaired Loans 38 43
Retail    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 344 348
Allowance on Impaired Loans 43 43
Impaired Loans Without a Related Allowance 460 451
Unpaid Contractual Balance 981 968
Total Recorded Investment in Impaired Loans 804 799
Residential mortgages    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 46 37
Allowance on Impaired Loans 3 2
Impaired Loans Without a Related Allowance 142 141
Unpaid Contractual Balance 247 235
Total Recorded Investment in Impaired Loans 188 178
Home equity loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 49 51
Allowance on Impaired Loans 5 3
Impaired Loans Without a Related Allowance 91 94
Unpaid Contractual Balance 187 191
Total Recorded Investment in Impaired Loans 140 145
Home equity lines of credit    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 24 23
Allowance on Impaired Loans 2 1
Impaired Loans Without a Related Allowance 186 173
Unpaid Contractual Balance 259 240
Total Recorded Investment in Impaired Loans 210 196
Home equity loans serviced by others    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 37 41
Allowance on Impaired Loans 3 4
Impaired Loans Without a Related Allowance 17 19
Unpaid Contractual Balance 64 70
Total Recorded Investment in Impaired Loans 54 60
Home equity lines of credit serviced by others    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 4 2
Allowance on Impaired Loans 0 0
Impaired Loans Without a Related Allowance 5 7
Unpaid Contractual Balance 13 13
Total Recorded Investment in Impaired Loans 9 9
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 18 15
Unpaid Contractual Balance 27 25
Total Recorded Investment in Impaired Loans 22 19
Education    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 146 154
Allowance on Impaired Loans 22 25
Impaired Loans Without a Related Allowance 0 1
Unpaid Contractual Balance 146 155
Total Recorded Investment in Impaired Loans 146 155
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 0 0
Unpaid Contractual Balance 26 26
Total Recorded Investment in Impaired Loans 25 26
Other retail    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 9 10
Allowance on Impaired Loans 1 2
Impaired Loans Without a Related Allowance 1 1
Unpaid Contractual Balance 12 13
Total Recorded Investment in Impaired Loans $ 10 $ 11