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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Impaired Loans by Class (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance $ 634 $ 641
Allowance on Impaired Loans 106 137
Impaired Loans Without a Related Allowance 589 742
Unpaid Contractual Balance 1,443 1,671
Total Recorded Investment in Impaired Loans 1,223 1,383
Commercial Banking    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 286 148
Allowance on Impaired Loans 63 36
Impaired Loans Without a Related Allowance 138 70
Unpaid Contractual Balance 475 214
Total Recorded Investment in Impaired Loans 424 218
Commercial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 247 92
Allowance on Impaired Loans 55 23
Impaired Loans Without a Related Allowance 134 58
Unpaid Contractual Balance 431 144
Total Recorded Investment in Impaired Loans 381 150
Commercial real estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 39 56
Allowance on Impaired Loans 8 13
Impaired Loans Without a Related Allowance 4 12
Unpaid Contractual Balance 44 70
Total Recorded Investment in Impaired Loans 43 68
Retail    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 348 493
Allowance on Impaired Loans 43 101
Impaired Loans Without a Related Allowance 451 672
Unpaid Contractual Balance 968 1,457
Total Recorded Investment in Impaired Loans 799 1,165
Residential mortgages    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 37 121
Allowance on Impaired Loans 2 16
Impaired Loans Without a Related Allowance 141 320
Unpaid Contractual Balance 235 608
Total Recorded Investment in Impaired Loans 178 441
Home equity loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 51 85
Allowance on Impaired Loans 3 11
Impaired Loans Without a Related Allowance 94 139
Unpaid Contractual Balance 191 283
Total Recorded Investment in Impaired Loans 145 224
Home equity lines of credit    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 23 27
Allowance on Impaired Loans 1 2
Impaired Loans Without a Related Allowance 173 167
Unpaid Contractual Balance 240 234
Total Recorded Investment in Impaired Loans 196 194
Home equity loans serviced by others    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 41 50
Allowance on Impaired Loans 4 8
Impaired Loans Without a Related Allowance 19 24
Unpaid Contractual Balance 70 88
Total Recorded Investment in Impaired Loans 60 74
Home equity lines of credit serviced by others    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 2 3
Allowance on Impaired Loans 0 1
Impaired Loans Without a Related Allowance 7 7
Unpaid Contractual Balance 13 14
Total Recorded Investment in Impaired Loans 9 10
Automobile    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 4 3
Allowance on Impaired Loans 0 0
Impaired Loans Without a Related Allowance 15 11
Unpaid Contractual Balance 25 19
Total Recorded Investment in Impaired Loans 19 14
Student    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 154 163
Allowance on Impaired Loans 25 48
Impaired Loans Without a Related Allowance 1 2
Unpaid Contractual Balance 155 165
Total Recorded Investment in Impaired Loans 155 165
Credit cards    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 26 28
Allowance on Impaired Loans 6 11
Impaired Loans Without a Related Allowance 0 0
Unpaid Contractual Balance 26 28
Total Recorded Investment in Impaired Loans 26 28
Other retail    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 10 13
Allowance on Impaired Loans 2 4
Impaired Loans Without a Related Allowance 1 2
Unpaid Contractual Balance 13 18
Total Recorded Investment in Impaired Loans $ 11 $ 15