LOAN SALES AND SECURITIZATIONS - Residential Mortgage Portfolio, MSRs Fair Value Method (Details) - Residential mortgage - USD ($) $ in Millions |
12 Months Ended | |
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Dec. 31, 2020 |
Dec. 31, 2019 |
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| Servicing Asset at Fair Value, Amount [Roll Forward] | ||
| Fair value, beginning of year | $ 7 | $ 10 |
| Servicing Asset at Fair Value, Additions | 102 | 0 |
| Time decay | (9) | (1) |
| Servicing Asset At Fair Value Payoffs | (43) | (1) |
| Servicing Asset at Fair Value, Changes in Fair Value Resulting from Changes in Valuation Inputs or Changes in Assumptions | (52) | (1) |
| Fair value, end of year | 210 | 7 |
| Revision of Prior Period, Adjustment | ||
| Servicing Asset at Fair Value, Amount [Roll Forward] | ||
| Fair value, beginning of year | 0 | |
| Fair value, end of year | $ 205 | $ 0 |
| Sensitivity Analysis Fair Value Carrying Method | ||
| Servicing Asset at Fair Value, Amount [Roll Forward] | ||
| Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Weighted Average Life | 7 years 7 months 6 days | 6 years 4 months 24 days |
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- Definition Servicing Asset At Fair Value Payoffs. No definition available.
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- Definition Time decay. No definition available.
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- Definition Weighted average life of securitized assets regardless of when the transfer occurred, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The value of new servicing assets, subsequently measured at fair value, acquired or created during the current period through purchases or from transfers of financial assets. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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. No definition available.
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- Definition Amount of increase (decrease) in fair value from changes in the inputs, assumptions, or model used to calculate the fair value of the contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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