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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, 2019
Dec. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance $ 452 $ 483
Allowance on Impaired Loans 67 64
Impaired Loans Without a Related Allowance 630 631
Unpaid Contractual Balance 1,299 1,363
Total Recorded Investment in Impaired Loans 1,082 1,114
Commercial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 195 218
Allowance on Impaired Loans 42 38
Impaired Loans Without a Related Allowance 191 173
Unpaid Contractual Balance 461 488
Total Recorded Investment in Impaired Loans 386 391
Commercial | Commercial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 195 186
Allowance on Impaired Loans 42 31
Impaired Loans Without a Related Allowance 165 167
Unpaid Contractual Balance 415 450
Total Recorded Investment in Impaired Loans 360 353
Commercial | Commercial real estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 0 32
Allowance on Impaired Loans 0 7
Impaired Loans Without a Related Allowance 26 6
Unpaid Contractual Balance 46 38
Total Recorded Investment in Impaired Loans 26 38
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 257 265
Allowance on Impaired Loans 25 26
Impaired Loans Without a Related Allowance 439 458
Unpaid Contractual Balance 838 875
Total Recorded Investment in Impaired Loans 696 723
Retail | Residential mortgages    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 28 28
Allowance on Impaired Loans 2 2
Impaired Loans Without a Related Allowance 118 127
Unpaid Contractual Balance 188 201
Total Recorded Investment in Impaired Loans 146 155
Retail | Home equity loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 30 34
Allowance on Impaired Loans 2 3
Impaired Loans Without a Related Allowance 70 76
Unpaid Contractual Balance 135 148
Total Recorded Investment in Impaired Loans 100 110
Retail | Home equity lines of credit    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 23 21
Allowance on Impaired Loans 1 1
Impaired Loans Without a Related Allowance 179 181
Unpaid Contractual Balance 243 244
Total Recorded Investment in Impaired Loans 202 202
Retail | Home equity loans serviced by others    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 20 22
Allowance on Impaired Loans 1 1
Impaired Loans Without a Related Allowance 19 19
Unpaid Contractual Balance 51 54
Total Recorded Investment in Impaired Loans 39 41
Retail | Home equity lines of credit serviced by others    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 1 1
Allowance on Impaired Loans 0 0
Impaired Loans Without a Related Allowance 6 7
Unpaid Contractual Balance 10 11
Total Recorded Investment in Impaired Loans 7 8
Retail | Automobile    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 1 1
Allowance on Impaired Loans 0 0
Impaired Loans Without a Related Allowance 21 22
Unpaid Contractual Balance 30 31
Total Recorded Investment in Impaired Loans 22 23
Retail | Education    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 126 130
Allowance on Impaired Loans 10 11
Impaired Loans Without a Related Allowance 23 23
Unpaid Contractual Balance 149 153
Total Recorded Investment in Impaired Loans 149 153
Retail | Credit cards    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 25 24
Allowance on Impaired Loans 8 7
Impaired Loans Without a Related Allowance 0 1
Unpaid Contractual Balance 25 25
Total Recorded Investment in Impaired Loans 25 25
Retail | Other retail    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Impaired Loans With a Related Allowance 3 4
Allowance on Impaired Loans 1 1
Impaired Loans Without a Related Allowance 3 2
Unpaid Contractual Balance 7 8
Total Recorded Investment in Impaired Loans $ 6 $ 6