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MORTGAGE BANKING - Changes Related to MSRs - Fair Value Method (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
MSRs |  |  |  |
Fair value as of beginning of period |  |  | $ 642 |
Fair value at end of the period | $ 606 |  | 606 |
Residential mortgages |  |  |  |
MSRs |  |  |  |
Fair value as of beginning of period | 568 | $ 531 | 642 | $ 600
Amounts capitalized | 85 | 78 | 238 | 170
Changes in unpaid principal balance during the period | (55) | (31) | (141) | (88)
Changes in fair value during the period | 8 | (68) | (323) | (172)
Fair value at end of the period | 606 | 510 | 606 | 510
Cumulative Effect, Period Of Adoption, Adjustment | Residential mortgages |  |  |  |
MSRs |  |  |  |
Fair value as of beginning of period | 0 | 0 | 190 | 0
Cumulative Effect, Period Of Adoption, Adjusted Balance | Residential mortgages |  |  |  |
MSRs |  |  |  |
Fair value as of beginning of period | $ 568 | $ 531 | $ 832 | $ 600

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