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MORTGAGE BANKING - Changes Related to MSR's - Fair Value Method (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($)
MSRs: |  |
Fair value at end of the period | $ 600 |
Residential mortgages |  |
MSRs: |  |
Fair value as of beginning of the period | 0 |
Acquired MSRs | 590 |
Amounts capitalized | 73 |
Changes in unpaid principal balance during the period | (32) | [1]
Changes in fair value during the period | (31) | [2]
Fair value at end of the period | $ 600 |
[1] | Represents changes in value due to i) passage of time including the impact from both regularly scheduled loan principal payments and partial paydowns, and ii) loans that paid off during the period.
[2] | Represents changes in value primarily due to market driven changes in interest rates and prepayment speeds.

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