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MORTGAGE BANKING - Narrative (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Retained earnings | $ 6,011 |  | $ 6,498
Loans and leases | 127,528 |  | 119,088
Mortgage loans serviced for others | Banking Subsidiaries |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | $ 79,200 |  | $ 77,500
Cumulative Effect, Period Of Adoption, Adjustment | Residential mortgages |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Retained earnings |  | $ 6 |

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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522 + Details
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