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MORTGAGE BANKING AND OTHER - Changes Related to MSRs - Fair Value Method (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
MSRs |  |
Fair value as of beginning of period | $ 658 |
Fair value at end of the period | 893 |
Residential mortgages |  |
MSRs |  |
Fair value as of beginning of period | 658 | $ 642
Amounts capitalized | 87 | 67
Changes in unpaid principal balance during the period | (58) | (40)
Changes in fair value during the period | 206 | (282)
Fair value at end of the period | 893 | 577
Cumulative Effect, Period Of Adoption, Adjustment | Residential mortgages |  |
MSRs |  |
Fair value as of beginning of period | 0 | 190
Cumulative Effect, Period Of Adoption, Adjusted Balance | Residential mortgages |  |
MSRs |  |
Fair value as of beginning of period | $ 658 | $ 832

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