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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, 2015
USD ($)
contract
Dec. 31, 2014
USD ($)
contract
Dec. 31, 2013
USD ($)
contract
Financing Receivable, Modifications [Line Items]      
Net Change to ALLL Resulting from Modification $ 4 $ 1 $ 5
Charge-offs Resulting from Modification 7 16 32
Commercial Banking      
Financing Receivable, Modifications [Line Items]      
Net Change to ALLL Resulting from Modification (1) 3 (2)
Charge-offs Resulting from Modification 1 3 1
Commercial      
Financing Receivable, Modifications [Line Items]      
Net Change to ALLL Resulting from Modification (1) 3 0
Charge-offs Resulting from Modification 1 0 1
Commercial real estate      
Financing Receivable, Modifications [Line Items]      
Net Change to ALLL Resulting from Modification 0 0 (2)
Charge-offs Resulting from Modification 0 3 0
Retail      
Financing Receivable, Modifications [Line Items]      
Net Change to ALLL Resulting from Modification 5 (2) 7
Charge-offs Resulting from Modification 6 13 31
Residential mortgages      
Financing Receivable, Modifications [Line Items]      
Net Change to ALLL Resulting from Modification (1) (4) 5
Charge-offs Resulting from Modification 0 1 2
Home equity loans      
Financing Receivable, Modifications [Line Items]      
Net Change to ALLL Resulting from Modification 0 (1) 2
Charge-offs Resulting from Modification 1 2 5
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 2 5 16
Home equity loans serviced by others      
Financing Receivable, Modifications [Line Items]      
Net Change to ALLL Resulting from Modification [1] 0 (1) 0
Charge-offs Resulting from Modification [1] 1 0 3
Home equity lines of credit serviced by others      
Financing Receivable, Modifications [Line Items]      
Net Change to ALLL Resulting from Modification [1] 0 0 0
Charge-offs Resulting from Modification [1] 0 0 1
Automobile      
Financing Receivable, Modifications [Line Items]      
Net Change to ALLL Resulting from Modification 0 0 0
Charge-offs Resulting from Modification 2 5 3
Student      
Financing Receivable, Modifications [Line Items]      
Net Change to ALLL Resulting from Modification 4 5 0
Charge-offs Resulting from Modification 0 0 0
Credit cards      
Financing Receivable, Modifications [Line Items]      
Net Change to ALLL Resulting from Modification 2 0 0
Charge-offs Resulting from Modification 0 0 0
Other retail      
Financing Receivable, Modifications [Line Items]      
Net Change to ALLL Resulting from Modification 0 (1) 0
Charge-offs Resulting from Modification $ 0 $ 0 $ 1
Interest Rate Reduction      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [2] 2,834 2,581 3,573
Pre-Modification Outstanding Recorded Investment [2] $ 73 $ 49 $ 87
Post-Modification Outstanding Recorded Investment [2] $ 73 $ 50 $ 89
Interest Rate Reduction | Commercial Banking      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [2] 26 34 137
Pre-Modification Outstanding Recorded Investment [2] $ 19 $ 9 $ 20
Post-Modification Outstanding Recorded Investment [2] $ 19 $ 9 $ 20
Interest Rate Reduction | Commercial      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [2] 25 25 126
Pre-Modification Outstanding Recorded Investment [2] $ 19 $ 8 $ 13
Post-Modification Outstanding Recorded Investment [2] $ 19 $ 7 $ 13
Interest Rate Reduction | Commercial real estate      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [2] 1 9 11
Pre-Modification Outstanding Recorded Investment [2] $ 0 $ 1 $ 7
Post-Modification Outstanding Recorded Investment [2] $ 0 $ 2 $ 7
Interest Rate Reduction | Retail      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [2] 2,808 2,547 3,436
Pre-Modification Outstanding Recorded Investment [2] $ 54 $ 40 $ 67
Post-Modification Outstanding Recorded Investment [2] $ 54 $ 41 $ 69
Interest Rate Reduction | Residential mortgages      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [2] 153 126 200
Pre-Modification Outstanding Recorded Investment [2] $ 31 $ 17 $ 32
Post-Modification Outstanding Recorded Investment [2] $ 31 $ 17 $ 33
Interest Rate Reduction | Home equity loans      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [2] 96 125 196
Pre-Modification Outstanding Recorded Investment [2] $ 5 $ 8 $ 15
Post-Modification Outstanding Recorded Investment [2] $ 5 $ 9 $ 16
Interest Rate Reduction | Home equity lines of credit      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [2] 4 7 18
Pre-Modification Outstanding Recorded Investment [2] $ 1 $ 0 $ 1
Post-Modification Outstanding Recorded Investment [2] $ 1 $ 0 $ 1
Interest Rate Reduction | Home equity loans serviced by others      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [1],[2] 29 42 31
Pre-Modification Outstanding Recorded Investment [1],[2] $ 2 $ 2 $ 2
Post-Modification Outstanding Recorded Investment [1],[2] $ 2 $ 2 $ 2
Interest Rate Reduction | Home equity lines of credit serviced by others      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [1],[2] 2 4 3
Pre-Modification Outstanding Recorded Investment [1],[2] $ 0 $ 0 $ 0
Post-Modification Outstanding Recorded Investment [1],[2] $ 0 $ 0 $ 0
Interest Rate Reduction | Automobile      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [2] 108 75 238
Pre-Modification Outstanding Recorded Investment [2] $ 2 $ 1 $ 2
Post-Modification Outstanding Recorded Investment [2] $ 2 $ 1 $ 2
Interest Rate Reduction | 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
Interest Rate Reduction | Credit cards      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [2] 2,413 2,165 2,729
Pre-Modification Outstanding Recorded Investment [2] $ 13 $ 12 $ 15
Post-Modification Outstanding Recorded Investment [2] $ 13 $ 12 $ 15
Interest Rate Reduction | Other retail      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [2] 3 3 21
Pre-Modification Outstanding Recorded Investment [2] $ 0 $ 0 $ 0
Post-Modification Outstanding Recorded Investment [2] $ 0 $ 0 $ 0
Maturity Extension      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [3] 421 566 2,366
Pre-Modification Outstanding Recorded Investment [3] $ 66 $ 52 $ 110
Post-Modification Outstanding Recorded Investment [3] $ 65 $ 51 $ 101
Maturity Extension | Commercial Banking      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [3] 161 146 137
Pre-Modification Outstanding Recorded Investment [3] $ 22 $ 24 $ 19
Post-Modification Outstanding Recorded Investment [3] $ 22 $ 24 $ 19
Maturity Extension | Commercial      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [3] 160 131 134
Pre-Modification Outstanding Recorded Investment [3] $ 22 $ 21 $ 18
Post-Modification Outstanding Recorded Investment [3] $ 22 $ 22 $ 18
Maturity Extension | Commercial real estate      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [3] 1 15 3
Pre-Modification Outstanding Recorded Investment [3] $ 0 $ 3 $ 1
Post-Modification Outstanding Recorded Investment [3] $ 0 $ 2 $ 1
Maturity Extension | Retail      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [3] 260 420 2,229
Pre-Modification Outstanding Recorded Investment [3] $ 44 $ 28 $ 91
Post-Modification Outstanding Recorded Investment [3] $ 43 $ 27 $ 82
Maturity Extension | Residential mortgages      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [3] 40 40 46
Pre-Modification Outstanding Recorded Investment [3] $ 7 $ 6 $ 5
Post-Modification Outstanding Recorded Investment [3] $ 6 $ 5 $ 6
Maturity Extension | Home equity loans      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [3] 191 85 94
Pre-Modification Outstanding Recorded Investment [3] $ 35 $ 5 $ 6
Post-Modification Outstanding Recorded Investment [3] $ 35 $ 6 $ 6
Maturity Extension | Home equity lines of credit      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [3] 23 276 2,081
Pre-Modification Outstanding Recorded Investment [3] $ 2 $ 17 $ 80
Post-Modification Outstanding Recorded Investment [3] $ 2 $ 16 $ 70
Maturity Extension | Home equity loans serviced by others      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [1],[3] 0 0 5
Pre-Modification Outstanding Recorded Investment [1],[3] $ 0 $ 0 $ 0
Post-Modification Outstanding Recorded Investment [1],[3] $ 0 $ 0 $ 0
Maturity Extension | Home equity lines of credit serviced by others      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [1],[3] 1 1 1
Pre-Modification Outstanding Recorded Investment [1],[3] $ 0 $ 0 $ 0
Post-Modification Outstanding Recorded Investment [1],[3] $ 0 $ 0 $ 0
Maturity Extension | Automobile      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [3] 5 18 2
Pre-Modification Outstanding Recorded Investment [3] $ 0 $ 0 $ 0
Post-Modification Outstanding Recorded Investment [3] $ 0 $ 0 $ 0
Maturity Extension | Student      
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
Maturity Extension | 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
Maturity Extension | Other retail      
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      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [4] 3,261 4,771 6,606
Pre-Modification Outstanding Recorded Investment [4] $ 165 $ 251 $ 253
Post-Modification Outstanding Recorded Investment [4] $ 159 $ 262 $ 232
Other | Commercial Banking      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [4] 17 28 7
Pre-Modification Outstanding Recorded Investment [4] $ 38 $ 59 $ 1
Post-Modification Outstanding Recorded Investment [4] $ 38 $ 81 $ 1
Other | Commercial      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [4] 16 27 6
Pre-Modification Outstanding Recorded Investment [4] $ 34 $ 52 $ 1
Post-Modification Outstanding Recorded Investment [4] $ 34 $ 74 $ 1
Other | Commercial real estate      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [4] 1 1 1
Pre-Modification Outstanding Recorded Investment [4] $ 4 $ 7 $ 0
Post-Modification Outstanding Recorded Investment [4] $ 4 $ 7 $ 0
Other | Retail      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [4] 3,244 4,743 6,599
Pre-Modification Outstanding Recorded Investment [4] $ 127 $ 192 $ 252
Post-Modification Outstanding Recorded Investment [4] $ 121 $ 181 $ 231
Other | Residential mortgages      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [4] 275 393 430
Pre-Modification Outstanding Recorded Investment [4] $ 33 $ 47 $ 64
Post-Modification Outstanding Recorded Investment [4] $ 33 $ 46 $ 63
Other | Home equity loans      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [4] 448 1,046 995
Pre-Modification Outstanding Recorded Investment [4] $ 28 $ 63 $ 57
Post-Modification Outstanding Recorded Investment [4] $ 28 $ 62 $ 51
Other | Home equity lines of credit      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [4] 320 356 771
Pre-Modification Outstanding Recorded Investment [4] $ 21 $ 25 $ 53
Post-Modification Outstanding Recorded Investment [4] $ 19 $ 21 $ 46
Other | Home equity loans serviced by others      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [1],[4] 124 138 269
Pre-Modification Outstanding Recorded Investment [1],[4] $ 6 $ 5 $ 12
Post-Modification Outstanding Recorded Investment [1],[4] $ 5 $ 5 $ 10
Other | Home equity lines of credit serviced by others      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [1],[4] 41 39 43
Pre-Modification Outstanding Recorded Investment [1],[4] $ 3 $ 2 $ 2
Post-Modification Outstanding Recorded Investment [1],[4] $ 2 $ 2 $ 1
Other | Automobile      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [4] 812 1,039 1,323
Pre-Modification Outstanding Recorded Investment [4] $ 14 $ 17 $ 13
Post-Modification Outstanding Recorded Investment [4] $ 12 $ 13 $ 10
Other | Student      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [4] 1,204 1,675 2,620
Pre-Modification Outstanding Recorded Investment [4] $ 22 $ 31 $ 48
Post-Modification Outstanding Recorded Investment [4] $ 22 $ 31 $ 47
Other | Credit cards      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [4] 0 0 0
Pre-Modification Outstanding Recorded Investment [4] $ 0 $ 0 $ 0
Post-Modification Outstanding Recorded Investment [4] $ 0 $ 0 $ 0
Other | Other retail      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [4] 20 57 148
Pre-Modification Outstanding Recorded Investment [4] $ 0 $ 2 $ 3
Post-Modification Outstanding Recorded Investment [4] $ 0 $ 1 $ 3
[1] The Company’s SBO portfolio consists of purchased home equity loans and lines that were originally serviced by others. The Company now services a portion of this portfolio internally.
[2] Includes modifications that consist of multiple concessions, one of which is an interest rate reduction.
[3] 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).
[4] Includes modifications other than interest rate reductions or maturity extensions, such as lowering scheduled payments for a specified period of time, principal forbearance, 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.