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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, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Residential mortgages (2) |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | $ 893 | $ 577 | $ 658 | $ 642
Issuances | 122 | 86 | 209 | 153
Settlements | (47) | (46) | (105) | (86)
Change in fair value during the period | (66) | (49) | 140 | (331)
Ending balance | 902 | 568 | 902 | 568
Other Derivative Contracts |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 38 | 143 | 197 | 19
Issuances | 81 | 234 | 243 | 405
Settlements | (97) | (344) | (180) | (420)
Change in fair value during the period | 67 | 140 | (171) | 169
Ending balance | $ 89 | 173 | $ 89 | 173
Cumulative Effect, Period Of Adoption, Adjustment | Residential mortgages (2) |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance |  | 0 |  | 190
Cumulative Effect, Period Of Adoption, Adjustment | Other Derivative Contracts |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance |  | 0 |  | 0
Cumulative Effect, Period Of Adoption, Adjusted Balance | Residential mortgages (2) |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance |  | 577 |  | 832
Cumulative Effect, Period Of Adoption, Adjusted Balance | Other Derivative Contracts |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance |  | $ 143 |  | $ 19

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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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