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FAIR VALUE MEASUREMENTS - Residential Mortgage and Commercial Real Estate Loans Held For Sale (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Aggregate Fair Value | $ 521 | $ 497
Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Aggregate Fair Value | 521 | 497
Level 2 | Residential loans held for sale |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Aggregate Fair Value | 365 | 326
Aggregate Unpaid Principal | 365 | 326
Aggregate Fair Value Less Aggregate Unpaid Principal | 0 | 0
Level 2 | Commercial and commercial real estate loans held for sale, at fair value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Aggregate Fair Value | 156 | 171
Aggregate Unpaid Principal | 156 | 171
Aggregate Fair Value Less Aggregate Unpaid Principal | $ 0 | $ 0

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- Definition The aggregate unpaid principal balance of loans measured at fair value. + References No definition available. + Details
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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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- Definition This item represents the difference between the aggregate fair value and the aggregate unpaid principal balance of loans and long-term receivables (other than securities categorized as trading, available-for-sale or held-to-maturity) that have contractual principal amounts and for which the fair value option has been elected. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612 + Details
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- Definition The face amount of loans that will be sold to other entities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + Details
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