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FAIR VALUE MEASUREMENTS - Schedule of Assets Measured on Recurring Basis Level 3 Rollforward (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Apr. 01, 2020 | Jan. 01, 2020 | 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 | $ 577 | $ 563 | $ 642 | $ 600 |  |  |
Transfers upon election of fair value method |  |  |  |  | $ 0 | 190 |
Beginning balance, adjusted |  |  |  |  | 577 | 832 |
Issuances | 86 | 57 | 153 | 92 |  |  |
Acquired MSRs | 0 |  | 0 |  |  |  |
Settlements | (46) | (31) | (86) | (57) |  |  |
Change in fair value during the period | (49) | (58) | (331) | (104) |  |  |
Transfers from Level 2 to Level 3 |  | 0 |  | 0 |  |  |
Ending balance | 568 | 531 | 568 | 531 |  |  |
Other Derivative Contracts |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |
Beginning balance | 143 | 18 | 19 | 0 |  |  |
Transfers upon election of fair value method |  |  |  |  | 0 | 0 |
Beginning balance, adjusted |  |  |  |  | $ 143 | $ 19 |
Issuances | 234 | 43 | 405 | 43 |  |  |
Acquired MSRs | 0 |  | 0 |  |  |  |
Settlements | (344) | (43) | (420) | (43) |  |  |
Change in fair value during the period | 140 | 7 | 169 | 7 |  |  |
Transfers from Level 2 to Level 3 |  | 0 |  | 18 |  |  |
Ending balance | $ 173 | $ 25 | $ 173 | $ 25 |  |  |

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- Definition Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption. + 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 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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