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MORTGAGE BANKING - Changes Related to MSRs - Fair Value Method (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2019
MSRs |  |
Fair value as of beginning of period |  | $ 600
Fair value at end of the period | $ 531 | 531
Residential mortgages |  |
MSRs |  |
Fair value as of beginning of period | 563 | 600
Amounts capitalized | 57 | 92
Changes in unpaid principal balance during the period | (31) | (57)
Changes in fair value during the period | (58) | (104)
Fair value at end of the period | $ 531 | $ 531

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