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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, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance $ 638 $ 634
Allowance on Impaired Loans 109 106
Impaired Loans Without a Related Allowance 680 589
Unpaid Contractual Balance 1,564 1,443
Total Recorded Investment in Impaired Loans 1,318 1,223
Commercial Banking    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 294 286
Allowance on Impaired Loans 64 63
Impaired Loans Without a Related Allowance 219 138
Unpaid Contractual Balance 583 475
Total Recorded Investment in Impaired Loans 513 424
Commercial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 259 247
Allowance on Impaired Loans 54 55
Impaired Loans Without a Related Allowance 212 134
Unpaid Contractual Balance 539 431
Total Recorded Investment in Impaired Loans 471 381
Commercial real estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 35 39
Allowance on Impaired Loans 10 8
Impaired Loans Without a Related Allowance 7 4
Unpaid Contractual Balance 44 44
Total Recorded Investment in Impaired Loans 42 43
Retail    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 344 348
Allowance on Impaired Loans 45 43
Impaired Loans Without a Related Allowance 461 451
Unpaid Contractual Balance 981 968
Total Recorded Investment in Impaired Loans 805 799
Residential mortgages    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 42 37
Allowance on Impaired Loans 3 2
Impaired Loans Without a Related Allowance 139 141
Unpaid Contractual Balance 237 235
Total Recorded Investment in Impaired Loans 181 178
Home equity loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 50 51
Allowance on Impaired Loans 3 3
Impaired Loans Without a Related Allowance 97 94
Unpaid Contractual Balance 196 191
Total Recorded Investment in Impaired Loans 147 145
Home equity lines of credit    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 21 23
Allowance on Impaired Loans 1 1
Impaired Loans Without a Related Allowance 183 173
Unpaid Contractual Balance 253 240
Total Recorded Investment in Impaired Loans 204 196
Home equity loans serviced by others    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 39 41
Allowance on Impaired Loans 3 4
Impaired Loans Without a Related Allowance 18 19
Unpaid Contractual Balance 68 70
Total Recorded Investment in Impaired Loans 57 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 6 7
Unpaid Contractual Balance 13 13
Total Recorded Investment in Impaired Loans 10 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 16 15
Unpaid Contractual Balance 25 25
Total Recorded Investment in Impaired Loans 20 19
Education    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 149 154
Allowance on Impaired Loans 28 25
Impaired Loans Without a Related Allowance 1 1
Unpaid Contractual Balance 151 155
Total Recorded Investment in Impaired Loans 150 155
Credit cards    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 26 26
Allowance on Impaired Loans 6 6
Impaired Loans Without a Related Allowance 0 0
Unpaid Contractual Balance 26 26
Total Recorded Investment in Impaired Loans 26 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