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MORTGAGE BANKING AND OTHER - Other Serviced Loans (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | $ 128,163 | $ 123,090
Education Loans Serviced For Others |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 761 | 974
SBA Loans Serviced For Others | CBNA and Other Subsidiaries |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | $ 80 | $ 51

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