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MORTGAGE BANKING AND OTHER - Changes Related to MSRs - Fair Value Method (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
MSRs |  |  |  |
Fair value as of beginning of period |  |  | $ 658 |
Fair value at end of the period | $ 902 |  | 902 |
Residential mortgages (2) |  |  |  |
MSRs |  |  |  |
Fair value as of beginning of period | 893 | $ 577 | 658 | $ 642
Amounts capitalized | 122 | 86 | 209 | 153
Changes in unpaid principal balance during the period | (47) | (46) | (105) | (86)
Changes in fair value during the period | (66) | (49) | 140 | (331)
Fair value at end of the period | 902 | 568 | 902 | 568
Cumulative Effect, Period Of Adoption, Adjustment | Residential mortgages (2) |  |  |  |
MSRs |  |  |  |
Fair value as of beginning of period | 0 | 0 | 0 | 190
Cumulative Effect, Period Of Adoption, Adjusted Balance | Residential mortgages (2) |  |  |  |
MSRs |  |  |  |
Fair value as of beginning of period | $ 893 | $ 577 | $ 658 | $ 832

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