OTHER ASSETS (Details) - USD ($) $ in Millions	Jun. 30, 2023	Sep. 30, 2022
Prepaid Expense and Other Assets [Abstract]
Investments in company-owned life insurance policies	$ 1,133	$ 944
Property and equipment, net	542	503
Lease right of use (“ROU”) assets	519	480
Prepaid expenses	223	173
Investments in FHLB and FRB stock	85	88
Client-owned fractional shares	100	78
All other	167	186
Total other assets	$ 2,769	$ 2,452