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MORTGAGE BANKING - Changes Related to MSRs - Fair Value Method (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
MSRs |  |
Fair value as of beginning of period | $ 642 |
Fair value at end of the period | 577 |
Residential mortgages |  |
MSRs |  |
Fair value as of beginning of period | 642 | $ 600
Amounts capitalized | 67 | 35
Changes in unpaid principal balance during the period | (40) | (26)
Changes in fair value during the period | (282) | (46)
Fair value at end of the period | 577 | 563
Cumulative Effect, Period Of Adoption, Adjustment | Residential mortgages |  |
MSRs |  |
Fair value as of beginning of period | 190 | 0
Cumulative Effect, Period Of Adoption, Adjusted Balance | Residential mortgages |  |
MSRs |  |
Fair value as of beginning of period | $ 832 | $ 600

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