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FAIR VALUE MEASUREMENTS - Schedule of Assets Measured at Fair Value on Recurring Basis (Details) - Residential mortgages $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | $ 0 |
Acquired MSRs | 590 |
Amount capitalized | 73 |
Change in unpaid principal balance during the period | (32) | [1]
Change in fair value during the period | (31) | [2]
Ending balance | $ 600 |
[1] | Represents changes in value of the MSRs due to i) passage of time including the impact from both regularly scheduled loan principal payments and partial paydowns, and ii) loans that paid off during the period.
[2] | Represents changes in value primarily due to market driven changes in interest rates and prepayment speeds.

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- Definition Fair Value Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Amount Capitalized + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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