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MORTGAGE BANKING AND OTHER - Other Serviced Loans (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 123,318	$ 123,090
Education Loans Serviced For Others
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	809	974
SBA Loans Serviced For Others | CBNA and Other Subsidiaries
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 67	$ 51

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