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MORTGAGE BANKING - Changes Related to MSRs - Amortization Method (Details) - Residential Mortgages - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
MSRs: |  |
Balance as of beginning of period | $ 201 | $ 167
Amount capitalized | 36 | 37
Purchases | 16 | 28
Amortization | (32) | (31)
Carrying amount before valuation allowance | 221 | 201
Valuation allowance for servicing assets |  |
Balance as of beginning of period | 3 | 5
Valuation recoveries | (3) | (2)
Balance at end of period | 0 | 3
Net carrying value of MSRs | $ 221 | $ 198

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