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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Troubled Debt Restructuring (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2016
USD ($)
contract
Dec. 31, 2015
USD ($)
contract
Dec. 31, 2014
USD ($)
contract
Financing Receivable, Modifications [Line Items]      
Net Change to ALLL Resulting from Modification $ 8 $ 4 $ 1
Charge-offs Resulting from Modification 4 7 16
Commercial Banking      
Financing Receivable, Modifications [Line Items]      
Net Change to ALLL Resulting from Modification 3 (1) 3
Charge-offs Resulting from Modification 0 1 3
Commercial      
Financing Receivable, Modifications [Line Items]      
Net Change to ALLL Resulting from Modification 3 (1) 3
Charge-offs Resulting from Modification 0 1 0
Commercial real estate      
Financing Receivable, Modifications [Line Items]      
Net Change to ALLL Resulting from Modification 0 0 0
Charge-offs Resulting from Modification 0 0 3
Retail      
Financing Receivable, Modifications [Line Items]      
Net Change to ALLL Resulting from Modification 5 5 (2)
Charge-offs Resulting from Modification 4 6 13
Residential mortgages      
Financing Receivable, Modifications [Line Items]      
Net Change to ALLL Resulting from Modification (1) (1) (4)
Charge-offs Resulting from Modification 0 0 1
Home equity loans      
Financing Receivable, Modifications [Line Items]      
Net Change to ALLL Resulting from Modification (1) 0 (1)
Charge-offs Resulting from Modification 0 1 2
Home equity lines of credit      
Financing Receivable, Modifications [Line Items]      
Net Change to ALLL Resulting from Modification 0 0 0
Charge-offs Resulting from Modification 1 2 5
Home equity loans serviced by others      
Financing Receivable, Modifications [Line Items]      
Net Change to ALLL Resulting from Modification 0 0 (1)
Charge-offs Resulting from Modification 0 1 0
Home equity lines of credit serviced by others      
Financing Receivable, Modifications [Line Items]      
Net Change to ALLL Resulting from Modification 0 0 0
Charge-offs Resulting from Modification 0 0 0
Automobile      
Financing Receivable, Modifications [Line Items]      
Net Change to ALLL Resulting from Modification 0 0 0
Charge-offs Resulting from Modification 3 2 5
Student      
Financing Receivable, Modifications [Line Items]      
Net Change to ALLL Resulting from Modification 4 4 5
Charge-offs Resulting from Modification 0 0 0
Credit cards      
Financing Receivable, Modifications [Line Items]      
Net Change to ALLL Resulting from Modification 3 2 0
Charge-offs Resulting from Modification 0 0 0
Other retail      
Financing Receivable, Modifications [Line Items]      
Net Change to ALLL Resulting from Modification 0 0 (1)
Charge-offs Resulting from Modification $ 0 $ 0 $ 0
Interest Rate Reduction      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [1] 2,585 2,834 2,581
Pre-Modification Outstanding Recorded Investment [1] $ 37 $ 73 $ 49
Post-Modification Outstanding Recorded Investment [1] $ 37 $ 73 $ 50
Interest Rate Reduction | Commercial Banking      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [1] 13 26 34
Pre-Modification Outstanding Recorded Investment [1] $ 1 $ 19 $ 9
Post-Modification Outstanding Recorded Investment [1] $ 1 $ 19 $ 9
Interest Rate Reduction | Commercial      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [1] 12 25 25
Pre-Modification Outstanding Recorded Investment [1] $ 1 $ 19 $ 8
Post-Modification Outstanding Recorded Investment [1] $ 1 $ 19 $ 7
Interest Rate Reduction | Commercial real estate      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [1] 1 1 9
Pre-Modification Outstanding Recorded Investment [1] $ 0 $ 0 $ 1
Post-Modification Outstanding Recorded Investment [1] $ 0 $ 0 $ 2
Interest Rate Reduction | Retail      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [1] 2,572 2,808 2,547
Pre-Modification Outstanding Recorded Investment [1] $ 36 $ 54 $ 40
Post-Modification Outstanding Recorded Investment [1] $ 36 $ 54 $ 41
Interest Rate Reduction | Residential mortgages      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [1] 71 153 126
Pre-Modification Outstanding Recorded Investment [1] $ 10 $ 31 $ 17
Post-Modification Outstanding Recorded Investment [1] $ 10 $ 31 $ 17
Interest Rate Reduction | Home equity loans      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [1] 97 96 125
Pre-Modification Outstanding Recorded Investment [1] $ 6 $ 5 $ 8
Post-Modification Outstanding Recorded Investment [1] $ 6 $ 5 $ 9
Interest Rate Reduction | Home equity lines of credit      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [1] 49 4 7
Pre-Modification Outstanding Recorded Investment [1] $ 4 $ 1 $ 0
Post-Modification Outstanding Recorded Investment [1] $ 4 $ 1 $ 0
Interest Rate Reduction | Home equity loans serviced by others      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [1] 18 29 42
Pre-Modification Outstanding Recorded Investment [1] $ 1 $ 2 $ 2
Post-Modification Outstanding Recorded Investment [1] $ 1 $ 2 $ 2
Interest Rate Reduction | Home equity lines of credit serviced by others      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [1] 8 2 4
Pre-Modification Outstanding Recorded Investment [1] $ 0 $ 0 $ 0
Post-Modification Outstanding Recorded Investment [1] $ 0 $ 0 $ 0
Interest Rate Reduction | Automobile      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [1] 138 108 75
Pre-Modification Outstanding Recorded Investment [1] $ 3 $ 2 $ 1
Post-Modification Outstanding Recorded Investment [1] $ 3 $ 2 $ 1
Interest Rate Reduction | Student      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [1] 0 0 0
Pre-Modification Outstanding Recorded Investment [1] $ 0 $ 0 $ 0
Post-Modification Outstanding Recorded Investment [1] $ 0 $ 0 $ 0
Interest Rate Reduction | Credit cards      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [1] 2,187 2,413 2,165
Pre-Modification Outstanding Recorded Investment [1] $ 12 $ 13 $ 12
Post-Modification Outstanding Recorded Investment [1] $ 12 $ 13 $ 12
Interest Rate Reduction | Other retail      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [1] 4 3 3
Pre-Modification Outstanding Recorded Investment [1] $ 0 $ 0 $ 0
Post-Modification Outstanding Recorded Investment [1] $ 0 $ 0 $ 0
Maturity Extension      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [2] 348 421 566
Pre-Modification Outstanding Recorded Investment [2] $ 54 $ 66 $ 52
Post-Modification Outstanding Recorded Investment [2] $ 55 $ 65 $ 51
Maturity Extension | Commercial Banking      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [2] 82 161 146
Pre-Modification Outstanding Recorded Investment [2] $ 25 $ 22 $ 24
Post-Modification Outstanding Recorded Investment [2] $ 26 $ 22 $ 24
Maturity Extension | Commercial      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [2] 81 160 131
Pre-Modification Outstanding Recorded Investment [2] $ 20 $ 22 $ 21
Post-Modification Outstanding Recorded Investment [2] $ 21 $ 22 $ 22
Maturity Extension | Commercial real estate      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [2] 1 1 15
Pre-Modification Outstanding Recorded Investment [2] $ 5 $ 0 $ 3
Post-Modification Outstanding Recorded Investment [2] $ 5 $ 0 $ 2
Maturity Extension | Retail      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [2] 266 260 420
Pre-Modification Outstanding Recorded Investment [2] $ 29 $ 44 $ 28
Post-Modification Outstanding Recorded Investment [2] $ 29 $ 43 $ 27
Maturity Extension | Residential mortgages      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [2] 60 40 40
Pre-Modification Outstanding Recorded Investment [2] $ 10 $ 7 $ 6
Post-Modification Outstanding Recorded Investment [2] $ 10 $ 6 $ 5
Maturity Extension | Home equity loans      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [2] 39 191 85
Pre-Modification Outstanding Recorded Investment [2] $ 4 $ 35 $ 5
Post-Modification Outstanding Recorded Investment [2] $ 5 $ 35 $ 6
Maturity Extension | Home equity lines of credit      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [2] 121 23 276
Pre-Modification Outstanding Recorded Investment [2] $ 13 $ 2 $ 17
Post-Modification Outstanding Recorded Investment [2] $ 12 $ 2 $ 16
Maturity Extension | Home equity loans serviced by others      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [2] 0 0 0
Pre-Modification Outstanding Recorded Investment [2] $ 0 $ 0 $ 0
Post-Modification Outstanding Recorded Investment [2] $ 0 $ 0 $ 0
Maturity Extension | Home equity lines of credit serviced by others      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [2] 5 1 1
Pre-Modification Outstanding Recorded Investment [2] $ 1 $ 0 $ 0
Post-Modification Outstanding Recorded Investment [2] $ 1 $ 0 $ 0
Maturity Extension | Automobile      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [2] 41 5 18
Pre-Modification Outstanding Recorded Investment [2] $ 1 $ 0 $ 0
Post-Modification Outstanding Recorded Investment [2] $ 1 $ 0 $ 0
Maturity Extension | Student      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [2] 0 0 0
Pre-Modification Outstanding Recorded Investment [2] $ 0 $ 0 $ 0
Post-Modification Outstanding Recorded Investment [2] $ 0 $ 0 $ 0
Maturity Extension | Credit cards      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [2] 0 0 0
Pre-Modification Outstanding Recorded Investment [2] $ 0 $ 0 $ 0
Post-Modification Outstanding Recorded Investment [2] $ 0 $ 0 $ 0
Maturity Extension | Other retail      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [2] 0 0 0
Pre-Modification Outstanding Recorded Investment [2] $ 0 $ 0 $ 0
Post-Modification Outstanding Recorded Investment [2] $ 0 $ 0 $ 0
Other      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [3] 2,501 3,261 4,771
Pre-Modification Outstanding Recorded Investment [3] $ 150 $ 165 $ 251
Post-Modification Outstanding Recorded Investment [3] $ 146 $ 159 $ 262
Other | Commercial Banking      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [3] 14 17 28
Pre-Modification Outstanding Recorded Investment [3] $ 48 $ 38 $ 59
Post-Modification Outstanding Recorded Investment [3] $ 48 $ 38 $ 81
Other | Commercial      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [3] 14 16 27
Pre-Modification Outstanding Recorded Investment [3] $ 48 $ 34 $ 52
Post-Modification Outstanding Recorded Investment [3] $ 48 $ 34 $ 74
Other | Commercial real estate      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [3] 0 1 1
Pre-Modification Outstanding Recorded Investment [3] $ 0 $ 4 $ 7
Post-Modification Outstanding Recorded Investment [3] $ 0 $ 4 $ 7
Other | Retail      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [3] 2,487 3,244 4,743
Pre-Modification Outstanding Recorded Investment [3] $ 102 $ 127 $ 192
Post-Modification Outstanding Recorded Investment [3] $ 98 $ 121 $ 181
Other | Residential mortgages      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [3] 247 275 393
Pre-Modification Outstanding Recorded Investment [3] $ 26 $ 33 $ 47
Post-Modification Outstanding Recorded Investment [3] $ 26 $ 33 $ 46
Other | Home equity loans      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [3] 279 448 1,046
Pre-Modification Outstanding Recorded Investment [3] $ 18 $ 28 $ 63
Post-Modification Outstanding Recorded Investment [3] $ 17 $ 28 $ 62
Other | Home equity lines of credit      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [3] 304 320 356
Pre-Modification Outstanding Recorded Investment [3] $ 23 $ 21 $ 25
Post-Modification Outstanding Recorded Investment [3] $ 22 $ 19 $ 21
Other | Home equity loans serviced by others      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [3] 60 124 138
Pre-Modification Outstanding Recorded Investment [3] $ 2 $ 6 $ 5
Post-Modification Outstanding Recorded Investment [3] $ 2 $ 5 $ 5
Other | Home equity lines of credit serviced by others      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [3] 24 41 39
Pre-Modification Outstanding Recorded Investment [3] $ 1 $ 3 $ 2
Post-Modification Outstanding Recorded Investment [3] $ 1 $ 2 $ 2
Other | Automobile      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [3] 1,081 812 1,039
Pre-Modification Outstanding Recorded Investment [3] $ 20 $ 14 $ 17
Post-Modification Outstanding Recorded Investment [3] $ 18 $ 12 $ 13
Other | Student      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [3] 479 1,204 1,675
Pre-Modification Outstanding Recorded Investment [3] $ 12 $ 22 $ 31
Post-Modification Outstanding Recorded Investment [3] $ 12 $ 22 $ 31
Other | Credit cards      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [3] 0 0 0
Pre-Modification Outstanding Recorded Investment [3] $ 0 $ 0 $ 0
Post-Modification Outstanding Recorded Investment [3] $ 0 $ 0 $ 0
Other | Other retail      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [3] 13 20 57
Pre-Modification Outstanding Recorded Investment [3] $ 0 $ 0 $ 2
Post-Modification Outstanding Recorded Investment [3] $ 0 $ 0 $ 1
[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, capitalizing arrearages, and principal forgiveness. 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.