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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Unfunded Commitments (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unfunded commitments tied to TDRs | $ 35 | $ 39
Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
TDR balance included in impaired loans | 244 | 129
Retail |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
TDR balance included in impaired loans | $ 742 | $ 761

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- Definition Reflects the unfunded portion of contractual agreements to lend funds to borrowers for loans whose terms have been modified by troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18794-111554 + Details
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- Details
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