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FAIR VALUE MEASUREMENTS - Residential Mortgage and Commercial Real Estate Loans Held For Sale (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Aggregate Fair Value | $ 4,304 | $ 3,564
Residential loans held for sale |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Aggregate Fair Value | 4,208 | 3,416
Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Aggregate Fair Value | 4,304 | 3,564
Level 2 | Residential loans held for sale |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Aggregate Fair Value | 4,208 | 3,416
Aggregate Unpaid Principal | 4,165 | 3,260
Aggregate Fair Value Greater (Less) Aggregate Unpaid Principal | 43 | 156
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 | 96 | 148
Aggregate Unpaid Principal | 98 | 153
Aggregate Fair Value Greater (Less) Aggregate Unpaid Principal | $ (2) | $ (5)

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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 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://fasb.org/us-gaap/role/ref/legacyRef -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 Amount, before valuation allowance, of financing receivable classified as held-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=120238483&loc=d3e48678-111004 + Details
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