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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Summary of Allowance for Credit Losses by Evaluation Method (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
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Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Individually evaluated | $ 86 | $ 81
Formula-based evaluation | 1,247 | 1,243
Allowance for credit losses | 1,333 | 1,324
Commercial |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Individually evaluated | 59 | 47
Formula-based evaluation | 739 | 726
Allowance for credit losses | 798 | 773
Retail |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Individually evaluated | 27 | 34
Formula-based evaluation | 508 | 517
Allowance for credit losses | $ 535 | $ 551

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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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Period Type: | instant

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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + 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 (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + 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 (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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