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MORTGAGE BANKING AND OTHER - Other Serviced Loans (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 122,195	$ 123,090
Education Loans Serviced For Others
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	903	974
SBA Loans Serviced For Others | CBNA and Other Subsidiaries
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 55	$ 51

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No definition available.

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Amount, before allowance for credit loss, of financing receivable.

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