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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Provision charged to income |  |  | $ 163 | $ 166 |
Nonperforming assets, net of valuation allowance | $ 29 |  | 29 |  | $ 36
Mortgage loans collateralized by OREO | 175 |  | 175 |  | 181
Larger balance commercial loans minimum balance (greater than) | 3 |  | $ 3 |  |
High loan to value criteria (exceeds) |  |  | 90.00% |  |
Allowance for loan and lease losses |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Provision charged to income | 83 | $ 70 | $ 163 | 145 |
Allowance for loan and lease losses | Commercial |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Provision charged to income | $ 16 | $ (25) | $ 39 | $ (16) |
Scenario, Adjustment | Allowance for loan and lease losses | Commercial |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Provision charged to income |  |  |  |  | $ 50

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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 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 Amount of expense related to estimated loss from loan and lease transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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