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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Troubled Debt Restructuring (Details) $ in Millions | 12 Months Ended
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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.

X
- Definition The effect of a change in method or methods for calculating the allowance for credit losses on the current period provision. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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