MORTGAGE LOAN SALES AND SERVICING RIGHTS - Residential Mortgage Portfolio, MSRs Amortization Method (Details) - Residential Mortgage - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2019 |
Jun. 30, 2018 |
Jun. 30, 2019 |
Jun. 30, 2018 |
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| Servicing Asset at Amortized Cost, Balance [Roll Forward] | ||||
| Carrying value, beginning of period | $ 202 | $ 200 | $ 211 | $ 191 |
| New servicing assets created | 10 | 11 | 19 | 20 |
| Impairment (charge) recovery | (18) | 0 | (27) | (7) |
| Amortization and other | (10) | (7) | (19) | (14) |
| Carrying value, end of period | 184 | 204 | 184 | 204 |
| Fair value, end of period | $ 184 | $ 212 | $ 184 | $ 212 |
| Amortization method | ||||
| Servicing Asset at Amortized Cost, Balance [Roll Forward] | ||||
| Weighted-average life (years) | 5 years 6 months | 7 years | 5 years 6 months | 7 years |
| X | ||||||||||
- 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://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of other-than-temporary impairment (OTTI) applied to contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amortized amount of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of additions from purchases, assumption or transfer to contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of amortization of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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 Fair value of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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