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MORTGAGE BANKING - Changes Related to MSRs - Fair Value Method (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
MSRs |  |  |  |
Fair value as of beginning of period |  |  | $ 600 |
Fair value at end of the period | $ 510 |  | 510 |
Residential mortgages |  |  |  |
MSRs |  |  |  |
Fair value as of beginning of period | 531 | $ 0 | 600 | $ 0
Acquired MSRs | 0 | 590 | 0 | 590
Amounts capitalized | 78 | 29 | 170 | 29
Changes in unpaid principal balance during the period | (31) | (12) | (88) | (12)
Changes in fair value during the period | (68) | 5 | (172) | 5
Fair value at end of the period | $ 510 | $ 612 | $ 510 | $ 612

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