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FAIR VALUE MEASUREMENTS - Changes in Fair Value for Assets with Fair Value Option (Details) - Level 2 - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Residential loans held for sale | Mortgage banking fees |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Changes in fair value | $ 45 | $ 10 | $ 103 | $ 9
Commercial and commercial real estate loans held for sale, at fair value | Other income |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Changes in fair value | $ 12 | $ 1 | $ (8) | $ 4

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- Definition For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612 + Details
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