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MORTGAGE BANKING - Economic Assumptions Used to Estimate Value of MSRs (Details) - USD ($) $ in Millions | 6 Months Ended |
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Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value [Abstract] |  |  |
MSR portfolio fair value | $ 568 |  | $ 642
Weighted average life (in years) | 3 years 8 months 12 days | 5 years 6 months |
Weighted average constant prepayment rate | 21.00% | 13.90% |
Weighted average option adjusted spread | 6.21% | 4.40% |
Minimum |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |
Sensitivity analysis, basis spread | 0.50% | 0.50% |
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 | $ 109 | $ 116 |
Decline in fair value due to 50 bps decrease in option adjusted spread | $ 9 | $ 12 |
Maximum |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |
Sensitivity analysis, basis spread | 1.00% | 1.00% |
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 | $ 145 | $ 222 |
Decline in fair value due to 100 bps decrease in option adjusted spread | $ 19 | $ 25 |

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- Definition Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122625-111746 + Details
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- Definition Weighted average life of financial assets and financial liabilities, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122596-111746 + Details
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