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MORTGAGE BANKING AND OTHER - Narrative (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Jan. 01, 2020
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | $ 128,163 | $ 123,090 |
Retained earnings | 7,978 | 6,445 |
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 | $ 90,200 | $ 81,200 |

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