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MORTGAGE BANKING - Economic Assumptions Used to Estimate Value of MSRs (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Servicing Assets And Servicing Liabilities At Amortized Cost, Assumptions Used To Estimate Fair Value [Abstract] |  |
MRS portfolio fair value | $ 261 | $ 218
Weighted average life (in years) | 6 years 10 months 24 days | 5 years 10 months 24 days
Weighted average constant prepayment rate | 7.70% | 10.00%
Weighted average discount rate | 9.30% | 9.90%
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value [Abstract] |  |
MSR portfolio fair value | $ 612 |
Weighted average life (in years) | 8 years 8 months 12 days |
Weighted average constant prepayment rate | 7.30% |
Weighted average option adjusted spread | 6.25% |
Minimum |  |
Servicing Assets at Fair Value [Line Items] |  |
Sensitivity analysis, basis spread | 0.50% | 0.50%
Servicing Assets And Servicing Liabilities At Amortized Cost, Assumptions Used To Estimate Fair Value [Abstract] |  |
Decline in fair value due to 50 bps decrease in prepayment rate | $ 18 | $ 22
Decline in fair value due to 50 bps decrease in discount rate | 5 | $ 4
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value [Abstract] |  |
Decline in fair value due to 50 bps decrease in prepayment rate | 54 |
Decline in fair value due to 50 bps decrease in discount rate | $ 14 |
Maximum |  |
Servicing Assets at Fair Value [Line Items] |  |
Sensitivity analysis, basis spread | 1.00% | 1.00%
Servicing Assets And Servicing Liabilities At Amortized Cost, Assumptions Used To Estimate Fair Value [Abstract] |  |
Decline in fair value due to 100 bps decrease in prepayment rate | $ 43 | $ 46
Decline in fair value due to 100 bps decrease in discount rate | 10 | $ 8
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value [Abstract] |  |
Decline in fair value due to 100 bps decrease in prepayment rate | 123 |
Decline in fair value due to 100 bps decrease in discount rate | $ 27 |

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- Definition The hypothetical financial impact of a 0.5 percent (50 basis points) adverse change of prepayment speed on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date under the amortization method. + References No definition available. + Details
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- Definition The hypothetical financial impact of a 1 percent (100 basis points) adverse change of prepayment speed on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date under the amortization method. + References No definition available. + Details
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- Definition Fair value of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122739-111746 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7516967&loc=d3e66267-113978 + Details
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