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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, 2016
Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance $ 666 $ 641
Allowance on Impaired Loans 133 137
Impaired Loans Without a Related Allowance 584 742
Unpaid Contractual Balance 1,455 1,671
Total Recorded Investment in Impaired Loans 1,250 1,383
Commercial Banking    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 301 148
Allowance on Impaired Loans 55 36
Impaired Loans Without a Related Allowance 137 70
Unpaid Contractual Balance 484 214
Total Recorded Investment in Impaired Loans 438 218
Commercial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 256 92
Allowance on Impaired Loans 46 23
Impaired Loans Without a Related Allowance 137 58
Unpaid Contractual Balance 439 144
Total Recorded Investment in Impaired Loans 393 150
Commercial real estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 45 56
Allowance on Impaired Loans 9 13
Impaired Loans Without a Related Allowance 0 12
Unpaid Contractual Balance 45 70
Total Recorded Investment in Impaired Loans 45 68
Retail    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 365 493
Allowance on Impaired Loans 78 101
Impaired Loans Without a Related Allowance 447 672
Unpaid Contractual Balance 971 1,457
Total Recorded Investment in Impaired Loans 812 1,165
Residential mortgages    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 43 121
Allowance on Impaired Loans 4 16
Impaired Loans Without a Related Allowance 132 320
Unpaid Contractual Balance 229 608
Total Recorded Investment in Impaired Loans 175 441
Home equity loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 53 85
Allowance on Impaired Loans 6 11
Impaired Loans Without a Related Allowance 99 139
Unpaid Contractual Balance 193 283
Total Recorded Investment in Impaired Loans 152 224
Home equity lines of credit    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 26 27
Allowance on Impaired Loans 3 2
Impaired Loans Without a Related Allowance 171 167
Unpaid Contractual Balance 241 234
Total Recorded Investment in Impaired Loans 197 194
Home equity loans serviced by others    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 43 50
Allowance on Impaired Loans 7 8
Impaired Loans Without a Related Allowance 21 24
Unpaid Contractual Balance 74 88
Total Recorded Investment in Impaired Loans 64 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 1 0
Impaired Loans Without a Related Allowance 14 11
Unpaid Contractual Balance 23 19
Total Recorded Investment in Impaired Loans 18 14
Student    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 158 163
Allowance on Impaired Loans 44 48
Impaired Loans Without a Related Allowance 1 2
Unpaid Contractual Balance 159 165
Total Recorded Investment in Impaired Loans 159 165
Credit cards    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 26 28
Allowance on Impaired Loans 10 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 3 4
Impaired Loans Without a Related Allowance 2 2
Unpaid Contractual Balance 13 18
Total Recorded Investment in Impaired Loans $ 12 $ 15