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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, 2018
USD ($)
contract
Dec. 31, 2017
USD ($)
contract
Dec. 31, 2016
USD ($)
contract
Financing Receivable, Modifications [Line Items]      
Net Change to ALLL Resulting from Modification $ 3 $ 1 $ 8
Charge-offs Resulting from Modification $ 5 $ 5 $ 4
Interest Rate Reduction      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [1] 2,641 2,724 2,585
Pre-Modification Outstanding Recorded Investment [1] $ 31 $ 34 $ 37
Post-Modification Outstanding Recorded Investment [1] $ 32 $ 36 $ 37
Maturity Extension      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [2] 339 386 348
Pre-Modification Outstanding Recorded Investment [2] $ 88 $ 65 $ 54
Post-Modification Outstanding Recorded Investment [2] $ 88 $ 66 $ 55
Other      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [3] 2,334 2,562 2,501
Pre-Modification Outstanding Recorded Investment [3] $ 314 $ 164 $ 150
Post-Modification Outstanding Recorded Investment [3] 308 161 146
Commercial      
Financing Receivable, Modifications [Line Items]      
Net Change to ALLL Resulting from Modification 0 (1) 3
Charge-offs Resulting from Modification 0 0 0
Commercial | Commercial      
Financing Receivable, Modifications [Line Items]      
Net Change to ALLL Resulting from Modification 0 (1) 3
Charge-offs Resulting from Modification 0 0 0
Commercial | 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 $ 0
Commercial | Interest Rate Reduction      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [1] 7 7 13
Pre-Modification Outstanding Recorded Investment [1] $ 1 $ 1 $ 1
Post-Modification Outstanding Recorded Investment [1] $ 1 $ 1 $ 1
Commercial | Interest Rate Reduction | Commercial      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [1] 7 7 12
Pre-Modification Outstanding Recorded Investment [1] $ 1 $ 1 $ 1
Post-Modification Outstanding Recorded Investment [1] $ 1 $ 1 $ 1
Commercial | Interest Rate Reduction | Commercial real estate      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [1] 0 0 1
Pre-Modification Outstanding Recorded Investment [1] $ 0 $ 0 $ 0
Post-Modification Outstanding Recorded Investment [1] $ 0 $ 0 $ 0
Commercial | Maturity Extension      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [2] 52 46 82
Pre-Modification Outstanding Recorded Investment [2] $ 54 $ 22 $ 25
Post-Modification Outstanding Recorded Investment [2] $ 53 $ 22 $ 26
Commercial | Maturity Extension | Commercial      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [2] 49 45 81
Pre-Modification Outstanding Recorded Investment [2] $ 23 $ 22 $ 20
Post-Modification Outstanding Recorded Investment [2] $ 22 $ 22 $ 21
Commercial | Maturity Extension | Commercial real estate      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [2] 3 1 1
Pre-Modification Outstanding Recorded Investment [2] $ 31 $ 0 $ 5
Post-Modification Outstanding Recorded Investment [2] $ 31 $ 0 $ 5
Commercial | Other      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [3] 55 16 14
Pre-Modification Outstanding Recorded Investment [3] $ 233 $ 70 $ 48
Post-Modification Outstanding Recorded Investment [3] $ 231 $ 71 $ 48
Commercial | Other | Commercial      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [3] 53 15 14
Pre-Modification Outstanding Recorded Investment [3] $ 202 $ 70 $ 48
Post-Modification Outstanding Recorded Investment [3] $ 200 $ 71 $ 48
Commercial | Other | Commercial real estate      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [3] 2 1 0
Pre-Modification Outstanding Recorded Investment [3] $ 31 $ 0 $ 0
Post-Modification Outstanding Recorded Investment [3] 31 0 0
Retail      
Financing Receivable, Modifications [Line Items]      
Net Change to ALLL Resulting from Modification 3 2 5
Charge-offs Resulting from Modification 5 5 4
Retail | Residential mortgages      
Financing Receivable, Modifications [Line Items]      
Net Change to ALLL Resulting from Modification (1) (1) (1)
Charge-offs Resulting from Modification 0 0 0
Retail | Home equity loans      
Financing Receivable, Modifications [Line Items]      
Net Change to ALLL Resulting from Modification 0 0 (1)
Charge-offs Resulting from Modification 0 0 0
Retail | 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 1 1
Retail | Home equity loans 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
Retail | 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
Retail | Automobile      
Financing Receivable, Modifications [Line Items]      
Net Change to ALLL Resulting from Modification 0 0 0
Charge-offs Resulting from Modification 4 4 3
Retail | Education      
Financing Receivable, Modifications [Line Items]      
Net Change to ALLL Resulting from Modification 1 2 4
Charge-offs Resulting from Modification 0 0 0
Retail | Credit cards      
Financing Receivable, Modifications [Line Items]      
Net Change to ALLL Resulting from Modification 4 3 3
Charge-offs Resulting from Modification 0 0 0
Retail | Other retail      
Financing Receivable, Modifications [Line Items]      
Net Change to ALLL Resulting from Modification (1) (2) 0
Charge-offs Resulting from Modification $ 0 $ 0 $ 0
Retail | Interest Rate Reduction      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [1] 2,634 2,717 2,572
Pre-Modification Outstanding Recorded Investment [1] $ 30 $ 33 $ 36
Post-Modification Outstanding Recorded Investment [1] $ 31 $ 35 $ 36
Retail | Interest Rate Reduction | Residential mortgages      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [1] 35 71 71
Pre-Modification Outstanding Recorded Investment [1] $ 4 $ 9 $ 10
Post-Modification Outstanding Recorded Investment [1] $ 4 $ 10 $ 10
Retail | Interest Rate Reduction | Home equity loans      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [1] 43 82 97
Pre-Modification Outstanding Recorded Investment [1] $ 3 $ 5 $ 6
Post-Modification Outstanding Recorded Investment [1] $ 4 $ 6 $ 6
Retail | Interest Rate Reduction | Home equity lines of credit      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [1] 76 50 49
Pre-Modification Outstanding Recorded Investment [1] $ 6 $ 3 $ 4
Post-Modification Outstanding Recorded Investment [1] $ 7 $ 3 $ 4
Retail | Interest Rate Reduction | Home equity loans serviced by others      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [1] 4 15 18
Pre-Modification Outstanding Recorded Investment [1] $ 0 $ 1 $ 1
Post-Modification Outstanding Recorded Investment [1] $ 0 $ 1 $ 1
Retail | Interest Rate Reduction | Home equity lines of credit serviced by others      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [1] 5 5 8
Pre-Modification Outstanding Recorded Investment [1] $ 0 $ 0 $ 0
Post-Modification Outstanding Recorded Investment [1] $ 0 $ 0 $ 0
Retail | Interest Rate Reduction | Automobile      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [1] 158 130 138
Pre-Modification Outstanding Recorded Investment [1] $ 4 $ 2 $ 3
Post-Modification Outstanding Recorded Investment [1] $ 3 $ 2 $ 3
Retail | Interest Rate Reduction | Education      
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
Retail | Interest Rate Reduction | Credit cards      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [1] 2,312 2,363 2,187
Pre-Modification Outstanding Recorded Investment [1] $ 13 $ 13 $ 12
Post-Modification Outstanding Recorded Investment [1] $ 13 $ 13 $ 12
Retail | Interest Rate Reduction | Other retail      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [1] 1 1 4
Pre-Modification Outstanding Recorded Investment [1] $ 0 $ 0 $ 0
Post-Modification Outstanding Recorded Investment [1] $ 0 $ 0 $ 0
Retail | Maturity Extension      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [2] 287 340 266
Pre-Modification Outstanding Recorded Investment [2] $ 34 $ 43 $ 29
Post-Modification Outstanding Recorded Investment [2] $ 35 $ 44 $ 29
Retail | Maturity Extension | Residential mortgages      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [2] 61 73 60
Pre-Modification Outstanding Recorded Investment [2] $ 8 $ 12 $ 10
Post-Modification Outstanding Recorded Investment [2] $ 8 $ 13 $ 10
Retail | Maturity Extension | Home equity loans      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [2] 1 1 39
Pre-Modification Outstanding Recorded Investment [2] $ 0 $ 0 $ 4
Post-Modification Outstanding Recorded Investment [2] $ 0 $ 0 $ 5
Retail | Maturity Extension | Home equity lines of credit      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [2] 178 235 121
Pre-Modification Outstanding Recorded Investment [2] $ 25 $ 30 $ 13
Post-Modification Outstanding Recorded Investment [2] $ 26 $ 30 $ 12
Retail | 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
Retail | Maturity Extension | Home equity lines of credit serviced by others      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [2] 1 2 5
Pre-Modification Outstanding Recorded Investment [2] $ 0 $ 0 $ 1
Post-Modification Outstanding Recorded Investment [2] $ 0 $ 0 $ 1
Retail | Maturity Extension | Automobile      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [2] 46 29 41
Pre-Modification Outstanding Recorded Investment [2] $ 1 $ 1 $ 1
Post-Modification Outstanding Recorded Investment [2] $ 1 $ 1 $ 1
Retail | Maturity Extension | Education      
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
Retail | 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
Retail | 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
Retail | Other      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [3] 2,279 2,546 2,487
Pre-Modification Outstanding Recorded Investment [3] $ 81 $ 94 $ 102
Post-Modification Outstanding Recorded Investment [3] $ 77 $ 90 $ 98
Retail | Other | Residential mortgages      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [3] 142 171 247
Pre-Modification Outstanding Recorded Investment [3] $ 17 $ 19 $ 26
Post-Modification Outstanding Recorded Investment [3] $ 17 $ 19 $ 26
Retail | Other | Home equity loans      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [3] 134 232 279
Pre-Modification Outstanding Recorded Investment [3] $ 5 $ 13 $ 18
Post-Modification Outstanding Recorded Investment [3] $ 5 $ 13 $ 17
Retail | Other | Home equity lines of credit      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [3] 413 395 304
Pre-Modification Outstanding Recorded Investment [3] $ 29 $ 27 $ 23
Post-Modification Outstanding Recorded Investment [3] $ 29 $ 27 $ 22
Retail | Other | Home equity loans serviced by others      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [3] 23 52 60
Pre-Modification Outstanding Recorded Investment [3] $ 1 $ 2 $ 2
Post-Modification Outstanding Recorded Investment [3] $ 1 $ 2 $ 2
Retail | Other | Home equity lines of credit serviced by others      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [3] 14 26 24
Pre-Modification Outstanding Recorded Investment [3] $ 1 $ 2 $ 1
Post-Modification Outstanding Recorded Investment [3] $ 1 $ 2 $ 1
Retail | Other | Automobile      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [3] 1,189 1,336 1,081
Pre-Modification Outstanding Recorded Investment [3] $ 21 $ 24 $ 20
Post-Modification Outstanding Recorded Investment [3] $ 17 $ 20 $ 18
Retail | Other | Education      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [3] 355 329 479
Pre-Modification Outstanding Recorded Investment [3] $ 7 $ 7 $ 12
Post-Modification Outstanding Recorded Investment [3] $ 7 $ 7 $ 12
Retail | 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
Retail | Other | Other retail      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | contract [3] 9 5 13
Pre-Modification Outstanding Recorded Investment [3] $ 0 $ 0 $ 0
Post-Modification Outstanding Recorded Investment [3] $ 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.