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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
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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

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