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MORTGAGE BANKING AND OTHER - Changes Related to MSRs - Fair Value Method (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
MSRs |  |
Fair value as of beginning of period | $ 658 |
Fair value at end of the period | 1,029 | $ 658
Residential mortgages |  |
MSRs |  |
Fair value as of beginning of period | 658 | 642
Amounts capitalized | 419 | 324
Changes in unpaid principal balance during the period | (212) | (196)
Changes in fair value during the period | 164 | (302)
Fair value at end of the period | 1,029 | 658
Cumulative Effect, Period of Adoption, Adjustment | Residential mortgages |  |
MSRs |  |
Fair value as of beginning of period | 0 | 190
Fair value at end of the period |  | 0
Cumulative Effect, Period Of Adoption, Adjusted Balance | Residential mortgages |  |
MSRs |  |
Fair value as of beginning of period | $ 658 | 832
Fair value at end of the period |  | $ 658

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