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MORTGAGE BANKING - Changes Related to MSRs - Amortization Method (Details) - Residential mortgages - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
MSRs: |  |  |  |
Balance as of beginning of period | $ 217 | $ 170 | $ 201 | $ 167
Amount capitalized | 11 | 9 | 26 | 28
Purchases | 0 | 0 | 16 | 0
Amortization | (9) | (8) | (24) | (24)
Carrying amount before valuation allowance | 219 | 171 | 219 | 171
Valuation allowance for servicing assets: |  |  |  |
Balance at beginning of period | 0 | 4 | 3 | 5
Valuation recoveries | 0 | 0 | (3) | (1)
Balance at end of period | 0 | 4 | 0 | 4
Net carrying value of MSRs | $ 219 | $ 167 | $ 219 | $ 167

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