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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Troubled Debt Restructuring (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
contract
Jun. 30, 2016
USD ($)
contract
Jun. 30, 2017
USD ($)
contract
Jun. 30, 2016
USD ($)
contract
Financing Receivable, Modifications [Line Items]        
Net Change to ALLL Resulting from Modification $ 2 $ 1 $ 3 $ 1
Charge-offs Resulting from Modification 1 1 2 1
Commercial Banking        
Financing Receivable, Modifications [Line Items]        
Net Change to ALLL Resulting from Modification 1 0 1 (1)
Charge-offs Resulting from Modification 0 0 0 0
Commercial        
Financing Receivable, Modifications [Line Items]        
Net Change to ALLL Resulting from Modification 1 0 1 (1)
Charge-offs Resulting from Modification 0 0 0 0
Commercial real estate        
Financing Receivable, Modifications [Line Items]        
Net Change to ALLL Resulting from Modification 0 0 0 0
Charge-offs Resulting from Modification 0 0 0 0
Leases        
Financing Receivable, Modifications [Line Items]        
Net Change to ALLL Resulting from Modification 0 0 0 0
Charge-offs Resulting from Modification 0 0 0 0
Retail        
Financing Receivable, Modifications [Line Items]        
Net Change to ALLL Resulting from Modification 1 1 2 2
Charge-offs Resulting from Modification 1 1 2 1
Residential mortgages        
Financing Receivable, Modifications [Line Items]        
Net Change to ALLL Resulting from Modification 0 0 0 0
Charge-offs Resulting from Modification 0 0 0 0
Home equity loans        
Financing Receivable, Modifications [Line Items]        
Net Change to ALLL Resulting from Modification 0 (1) 0 (1)
Charge-offs Resulting from Modification 0 0 0 0
Home equity lines of credit        
Financing Receivable, Modifications [Line Items]        
Net Change to ALLL Resulting from Modification 0 0 0 0
Charge-offs Resulting from Modification 0 0 0 0
Home equity loans serviced by others        
Financing Receivable, Modifications [Line Items]        
Net Change to ALLL Resulting from Modification 0 0 0 0
Charge-offs Resulting from Modification 0 0 0 0
Home equity lines of credit serviced by others        
Financing Receivable, Modifications [Line Items]        
Net Change to ALLL Resulting from Modification 0 0 0 0
Charge-offs Resulting from Modification 0 0 0 0
Automobile        
Financing Receivable, Modifications [Line Items]        
Net Change to ALLL Resulting from Modification 0 0 0 0
Charge-offs Resulting from Modification 1 1 2 1
Education        
Financing Receivable, Modifications [Line Items]        
Net Change to ALLL Resulting from Modification 1 1 1 2
Charge-offs Resulting from Modification 0 0 0 0
Credit cards        
Financing Receivable, Modifications [Line Items]        
Net Change to ALLL Resulting from Modification 1 1 2 1
Charge-offs Resulting from Modification 0 0 0 0
Other retail        
Financing Receivable, Modifications [Line Items]        
Net Change to ALLL Resulting from Modification (1) 0 (1) 0
Charge-offs Resulting from Modification $ 0 $ 0 $ 0 $ 0
Interest Rate Reduction        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract [1] 719 615 1,389 1,216
Pre-Modification Outstanding Recorded Investment [1] $ 9 $ 5 $ 18 $ 15
Post-Modification Outstanding Recorded Investment [1] $ 9 $ 5 $ 19 $ 15
Interest Rate Reduction | Commercial Banking        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract [1] 2 3 4 8
Pre-Modification Outstanding Recorded Investment [1] $ 0 $ 0 $ 1 $ 1
Post-Modification Outstanding Recorded Investment [1] $ 0 $ 0 $ 1 $ 1
Interest Rate Reduction | Commercial        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract [1] 2 3 4 8
Pre-Modification Outstanding Recorded Investment [1] $ 0 $ 0 $ 1 $ 1
Post-Modification Outstanding Recorded Investment [1] $ 0 $ 0 $ 1 $ 1
Interest Rate Reduction | Commercial real estate        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract [1] 0 0 0 0
Pre-Modification Outstanding Recorded Investment [1] $ 0 $ 0 $ 0 $ 0
Post-Modification Outstanding Recorded Investment [1] $ 0 $ 0 $ 0 $ 0
Interest Rate Reduction | Leases        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract [1] 0 0 0 0
Pre-Modification Outstanding Recorded Investment [1] $ 0 $ 0 $ 0 $ 0
Post-Modification Outstanding Recorded Investment [1] $ 0 $ 0 $ 0 $ 0
Interest Rate Reduction | Retail        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract [1] 717 612 1,385 1,208
Pre-Modification Outstanding Recorded Investment [1] $ 9 $ 5 $ 17 $ 14
Post-Modification Outstanding Recorded Investment [1] $ 9 $ 5 $ 18 $ 14
Interest Rate Reduction | Residential mortgages        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract [1] 25 3 43 25
Pre-Modification Outstanding Recorded Investment [1] $ 4 $ 1 $ 5 $ 4
Post-Modification Outstanding Recorded Investment [1] $ 3 $ 1 $ 5 $ 4
Interest Rate Reduction | Home equity loans        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract [1] 22 15 43 29
Pre-Modification Outstanding Recorded Investment [1] $ 1 $ 1 $ 2 $ 2
Post-Modification Outstanding Recorded Investment [1] $ 2 $ 1 $ 3 $ 2
Interest Rate Reduction | Home equity lines of credit        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract [1] 14 6 30 13
Pre-Modification Outstanding Recorded Investment [1] $ 0 $ 0 $ 1 $ 1
Post-Modification Outstanding Recorded Investment [1] $ 0 $ 0 $ 1 $ 1
Interest Rate Reduction | Home equity loans serviced by others        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract [1] 5 3 11 6
Pre-Modification Outstanding Recorded Investment [1] $ 0 $ 0 $ 1 $ 0
Post-Modification Outstanding Recorded Investment [1] $ 0 $ 0 $ 1 $ 0
Interest Rate Reduction | Home equity lines of credit serviced by others        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract [1] 2 2 3 2
Pre-Modification Outstanding Recorded Investment [1] $ 0 $ 0 $ 0 $ 0
Post-Modification Outstanding Recorded Investment [1] $ 0 $ 0 $ 0 $ 0
Interest Rate Reduction | Automobile        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract [1] 25 30 65 51
Pre-Modification Outstanding Recorded Investment [1] $ 0 $ 0 $ 1 $ 1
Post-Modification Outstanding Recorded Investment [1] $ 0 $ 0 $ 1 $ 1
Interest Rate Reduction | Education        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract [1] 0 0 0 0
Pre-Modification Outstanding Recorded Investment [1] $ 0 $ 0 $ 0 $ 0
Post-Modification Outstanding Recorded Investment [1] $ 0 $ 0 $ 0 $ 0
Interest Rate Reduction | Credit cards        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract [1] 624 552 1,189 1,081
Pre-Modification Outstanding Recorded Investment [1] $ 4 $ 3 $ 7 $ 6
Post-Modification Outstanding Recorded Investment [1] $ 4 $ 3 $ 7 $ 6
Interest Rate Reduction | Other retail        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract [1] 0 1 1 1
Pre-Modification Outstanding Recorded Investment [1] $ 0 $ 0 $ 0 $ 0
Post-Modification Outstanding Recorded Investment [1] $ 0 $ 0 $ 0 $ 0
Maturity Extension        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract [2] 110 73 190 146
Pre-Modification Outstanding Recorded Investment [2] $ 27 $ 10 $ 37 $ 19
Post-Modification Outstanding Recorded Investment [2] $ 27 $ 10 $ 37 $ 19
Maturity Extension | Commercial Banking        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract [2] 11 28 18 54
Pre-Modification Outstanding Recorded Investment [2] $ 13 $ 4 $ 14 $ 8
Post-Modification Outstanding Recorded Investment [2] $ 13 $ 4 $ 14 $ 8
Maturity Extension | Commercial        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract [2] 11 28 18 54
Pre-Modification Outstanding Recorded Investment [2] $ 13 $ 4 $ 14 $ 8
Post-Modification Outstanding Recorded Investment [2] $ 13 $ 4 $ 14 $ 8
Maturity Extension | Commercial real estate        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract [2] 0 0 0 0
Pre-Modification Outstanding Recorded Investment [2] $ 0 $ 0 $ 0 $ 0
Post-Modification Outstanding Recorded Investment [2] $ 0 $ 0 $ 0 $ 0
Maturity Extension | Leases        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract [2] 0 0 0 0
Pre-Modification Outstanding Recorded Investment [2] $ 0 $ 0 $ 0 $ 0
Post-Modification Outstanding Recorded Investment [2] $ 0 $ 0 $ 0 $ 0
Maturity Extension | Retail        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract [2] 99 45 172 92
Pre-Modification Outstanding Recorded Investment [2] $ 14 $ 6 $ 23 $ 11
Post-Modification Outstanding Recorded Investment [2] $ 14 $ 6 $ 23 $ 11
Maturity Extension | Residential mortgages        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract [2] 25 10 36 16
Pre-Modification Outstanding Recorded Investment [2] $ 5 $ 2 $ 8 $ 3
Post-Modification Outstanding Recorded Investment [2] $ 5 $ 2 $ 8 $ 3
Maturity Extension | Home equity loans        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract [2] 0 21 1 37
Pre-Modification Outstanding Recorded Investment [2] $ 0 $ 2 $ 0 $ 4
Post-Modification Outstanding Recorded Investment [2] $ 0 $ 2 $ 0 $ 4
Maturity Extension | Home equity lines of credit        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract [2] 67 8 118 27
Pre-Modification Outstanding Recorded Investment [2] $ 9 $ 1 $ 15 $ 3
Post-Modification Outstanding Recorded Investment [2] $ 9 $ 1 $ 15 $ 3
Maturity Extension | Home equity loans serviced by others        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract [2] 0 0 0 0
Pre-Modification Outstanding Recorded Investment [2] $ 0 $ 0 $ 0 $ 0
Post-Modification Outstanding Recorded Investment [2] $ 0 $ 0 $ 0 $ 0
Maturity Extension | Home equity lines of credit serviced by others        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract [2] 0 3 2 4
Pre-Modification Outstanding Recorded Investment [2] $ 0 $ 1 $ 0 $ 1
Post-Modification Outstanding Recorded Investment [2] $ 0 $ 1 $ 0 $ 1
Maturity Extension | Automobile        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract [2] 7 3 15 8
Pre-Modification Outstanding Recorded Investment [2] $ 0 $ 0 $ 0 $ 0
Post-Modification Outstanding Recorded Investment [2] $ 0 $ 0 $ 0 $ 0
Maturity Extension | Education        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract [2] 0 0 0 0
Pre-Modification Outstanding Recorded Investment [2] $ 0 $ 0 $ 0 $ 0
Post-Modification Outstanding Recorded Investment [2] $ 0 $ 0 $ 0 $ 0
Maturity Extension | Credit cards        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract [2] 0 0 0 0
Pre-Modification Outstanding Recorded Investment [2] $ 0 $ 0 $ 0 $ 0
Post-Modification Outstanding Recorded Investment [2] $ 0 $ 0 $ 0 $ 0
Maturity Extension | Other retail        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract [2] 0 0 0 0
Pre-Modification Outstanding Recorded Investment [2] $ 0 $ 0 $ 0 $ 0
Post-Modification Outstanding Recorded Investment [2] $ 0 $ 0 $ 0 $ 0
Other        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract [3] 578 742 1,121 1,336
Pre-Modification Outstanding Recorded Investment [3] $ 55 $ 48 $ 83 $ 93
Post-Modification Outstanding Recorded Investment [3] $ 53 $ 47 $ 80 $ 91
Other | Commercial Banking        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract [3] 4 4 5 9
Pre-Modification Outstanding Recorded Investment [3] $ 32 $ 20 $ 36 $ 41
Post-Modification Outstanding Recorded Investment [3] $ 31 $ 21 $ 35 $ 41
Other | Commercial        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract [3] 4 4 4 9
Pre-Modification Outstanding Recorded Investment [3] $ 32 $ 20 $ 32 $ 41
Post-Modification Outstanding Recorded Investment [3] $ 31 $ 21 $ 31 $ 41
Other | Commercial real estate        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract [3] 0 0 0 0
Pre-Modification Outstanding Recorded Investment [3] $ 0 $ 0 $ 0 $ 0
Post-Modification Outstanding Recorded Investment [3] $ 0 $ 0 $ 0 $ 0
Other | Leases        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract [3] 0 0 1 0
Pre-Modification Outstanding Recorded Investment [3] $ 0 $ 0 $ 4 $ 0
Post-Modification Outstanding Recorded Investment [3] $ 0 $ 0 $ 4 $ 0
Other | Retail        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract [3] 574 738 1,116 1,327
Pre-Modification Outstanding Recorded Investment [3] $ 23 $ 28 $ 47 $ 52
Post-Modification Outstanding Recorded Investment [3] $ 22 $ 26 $ 45 $ 50
Other | Residential mortgages        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract [3] 44 67 92 131
Pre-Modification Outstanding Recorded Investment [3] $ 6 $ 7 $ 10 $ 15
Post-Modification Outstanding Recorded Investment [3] $ 6 $ 7 $ 10 $ 15
Other | Home equity loans        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract [3] 42 94 144 181
Pre-Modification Outstanding Recorded Investment [3] $ 2 $ 5 $ 8 $ 11
Post-Modification Outstanding Recorded Investment [3] $ 2 $ 5 $ 8 $ 11
Other | Home equity lines of credit        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract [3] 112 92 187 124
Pre-Modification Outstanding Recorded Investment [3] $ 8 $ 6 $ 14 $ 8
Post-Modification Outstanding Recorded Investment [3] $ 7 $ 6 $ 13 $ 8
Other | Home equity loans serviced by others        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract [3] 16 16 30 34
Pre-Modification Outstanding Recorded Investment [3] $ 0 $ 0 $ 1 $ 1
Post-Modification Outstanding Recorded Investment [3] $ 0 $ 0 $ 1 $ 1
Other | Home equity lines of credit serviced by others        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract [3] 2 5 13 13
Pre-Modification Outstanding Recorded Investment [3] $ 0 $ 1 $ 1 $ 1
Post-Modification Outstanding Recorded Investment [3] $ 0 $ 0 $ 1 $ 0
Other | Automobile        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract [3] 349 348 625 539
Pre-Modification Outstanding Recorded Investment [3] $ 6 $ 7 $ 11 $ 10
Post-Modification Outstanding Recorded Investment [3] $ 6 $ 6 $ 10 $ 9
Other | Education        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract [3] 7 111 22 297
Pre-Modification Outstanding Recorded Investment [3] $ 1 $ 2 $ 2 $ 6
Post-Modification Outstanding Recorded Investment [3] $ 1 $ 2 $ 2 $ 6
Other | Credit cards        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract [3] 0 0 0 0
Pre-Modification Outstanding Recorded Investment [3] $ 0 $ 0 $ 0 $ 0
Post-Modification Outstanding Recorded Investment [3] $ 0 $ 0 $ 0 $ 0
Other | Other retail        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | contract [3] 2 5 3 8
Pre-Modification Outstanding Recorded Investment [3] $ 0 $ 0 $ 0 $ 0
Post-Modification Outstanding Recorded Investment [3] $ 0 $ 0 $ 0 $ 0
[1] Includes modifications that consist of multiple concessions, one of which is an interest rate reduction.
[2] Includes modifications that consist of multiple concessions, one of which is a maturity extension (unless one of the other concessions was an interest rate reduction).
[3] Includes modifications other than interest rate reductions or maturity extensions, such as lowering scheduled payments for a specified period of time, principal forgiveness, and capitalizing arrearages. Also included are the following: deferrals, trial modifications, certain bankruptcies, loans in forbearance and prepayment plans. Modifications can include the deferral of accrued interest resulting in post modification balances being higher than pre-modification.