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MORTGAGE BANKING AND OTHER SERVICED LOANS - Changes Related to MSRs - Amortization Method (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Education
Servicing Asset at Amortized Cost [Line Items]
Other serviced loans	$ 502	$ 602
Commercial and Industrial
Servicing Asset at Amortized Cost [Line Items]
Other serviced loans	$ 94	$ 91

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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