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MORTGAGE BANKING - Changes Related to MSRs - Amortization Method (Details) - Residential mortgages - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
MSRs: |  |
Balance as of beginning of period | $ 221 | $ 201
Amount capitalized | 0 | 36
Purchases | 0 | 16
Amortization | (38) | (32)
Carrying amount before valuation allowance | 183 | 221
Valuation allowance for servicing assets |  |
Balance as of beginning of period | 0 | 3
Valuation charge-offs (recoveries) | 1 | (3)
Balance at end of period | 1 | 0
Net carrying value of MSRs | $ 182 | $ 221

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