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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - TDRs and Unfunded Commitments (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unfunded commitments related to TDRs | $ 42 | $ 30
Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
TDR balance included in impaired loans | 297 | 304
Retail |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
TDR balance included in impaired loans | $ 667 | $ 723

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- Definition Amount of unfunded portion of contractual agreement to lend funds to borrower for financing receivable modified as troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118939409&loc=d3e18794-111554 + Details
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