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MORTGAGE BANKING AND OTHER - Narrative (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | $ 123,090 |  | $ 119,088
Retained earnings | 6,445 |  | 6,498
Mortgage loans serviced for others | Cumulative Effect, Period of Adoption, Adjustment |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Retained earnings |  | $ 6 |
Banking Subsidiaries | Mortgage loans serviced for others |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | $ 81,200 |  | $ 77,500

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