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MORTGAGE BANKING - Changes Related to MSR's - Fair Value Method (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
MSRs: |  |
Fair value as of beginning of the period | $ 600 |
Fair value at end of the period | 642 | $ 600
Residential mortgages |  |
MSRs: |  |
Fair value as of beginning of the period | 600 | 0
Acquired MSRs | 0 | 590
Amounts capitalized | 270 | 73
Changes in unpaid principal balance during the period | (119) | (32)
Changes in fair value during the period | (109) | (31)
Fair value at end of the period | $ 642 | $ 600

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