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FAIR VALUE MEASUREMENTS - Schedule of Assets Measured on Recurring Basis Level 3 Rollforward (Details) - USD ($) $ in Millions | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Jan. 01, 2020 | Jan. 02, 2019 | Jan. 01, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Transfers upon election of fair value method |  |  |  | $ (331) | $ 17
Residential mortgages |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Beginning balance | $ 642 | $ 600 |  |  |
Transfers upon election of fair value method |  |  | $ 190 |  |
Beginning balance, adjusted |  |  | 832 |  |
Issuances | 67 | 35 |  |  |
Acquired MSRs | 0 |  |  |  |
Settlements | (40) | (26) |  |  |
Change in fair value during the period | (282) | (46) |  |  |
Transfers from Level 2 to Level 3 |  | 0 |  |  |
Ending balance | 577 | 563 |  |  |
Other Derivative Contracts |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Beginning balance | 19 | 0 |  |  |
Transfers upon election of fair value method |  |  | 0 |  |
Beginning balance, adjusted |  |  | $ 19 |  |
Issuances | 171 | 0 |  |  |
Acquired MSRs | 0 |  |  |  |
Settlements | (76) | 0 |  |  |
Change in fair value during the period | 29 | 0 |  |  |
Transfers from Level 2 to Level 3 |  | 18 |  |  |
Ending balance | $ 143 | $ 18 |  |  |

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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 income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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