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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Nonperforming assets, net of valuation allowance | $ 40 |  | $ 40 |  | $ 34
Mortgage loans collateralized by OREO | 164 |  | 164 |  | $ 172
Larger balance commercial loans minimum balance (greater than) | 3 |  | 3 |  |
Net change to ALLL from modification | 3 | $ 1 | 7 | $ 3 |
Charge-offs from modification of loans | 1 | 2 | $ 3 | 3 |
High loan to value criteria (exceeds) |  |  | 90.00% |  |
Commercial | Commercial |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
TDR's that defaulted within 12 months of modification date | 0 | 32 | $ 1 | 52 |
Retail | Retail |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
TDR's that defaulted within 12 months of modification date | $ 9 | $ 10 | $ 28 | $ 30 |

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- Definition Minimum qualifying carrying balance of commercial loans. + References No definition available. + Details
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- Definition An entity's internal risk assessment as having high risk defined as certain loans with outstanding balances exceeding a percentage of the value of underlying collateral. + References No definition available. + Details
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- Definition Recorded investment in non performing assets receivable net of valuation allowance as of the balance sheet date. + References No definition available. + Details
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- Definition Recorded investment in financing receivables that are on nonaccrual status and are collateralized by land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement as of the balance sheet date. + References No definition available. + Details
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- 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=118936363&loc=SL6953423-111524 + Details
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- Definition Amount of financing receivable modified as troubled debt restructuring within previous 12 months, with subsequent payment default. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953682-111524 + Details
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- Definition Reflects the amount of the write-down related to a troubled debt restructuring. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118939409&loc=d3e18845-111554 + Details
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