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FAIR VALUE MEASUREMENTS - Schedule of Assets Measured on Recurring Basis Level 3 Rollforward (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Mortgage Servicing Rights |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | $ 902 | $ 568 | $ 658 | $ 642
Purchases |  | 0 |  | 0
Issuances | 109 | 85 | 318 | 238
Settlements | (54) | (55) | (159) | (141)
Change in fair value during the period recognized in earnings | 21 | 8 | 161 | (323)
Ending balance | 978 | 606 | 978 | 606
Asset-Backed Securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance |  | 0 |  | 0
Purchases |  | 813 |  | 813
Issuances |  | 0 |  | 0
Settlements |  | 0 |  | 0
Change in fair value during the period recognized in earnings |  | 0 |  | 0
Ending balance |  | 813 |  | 813
Other Derivative Contracts |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 89 | 173 | 197 | 19
Purchases |  | 0 |  | 0
Issuances | 81 | 283 | 323 | 688
Settlements | (104) | (372) | (283) | (792)
Change in fair value during the period recognized in earnings | (13) | 125 | (184) | 294
Ending balance | $ 53 | 209 | $ 53 | 209
Cumulative Effect, Period of Adoption, Adjustment | Mortgage Servicing Rights |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance |  | 0 |  | 190
Cumulative Effect, Period of Adoption, Adjustment | Asset-Backed Securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance |  | 0 |  | 0
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 | Mortgage Servicing Rights |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance |  | 568 |  | 832
Cumulative Effect, Period of Adoption, Adjusted Balance | Asset-Backed Securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance |  | 0 |  | 0
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 |  | $ 173 |  | $ 19

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