OTHER ASSETS (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Prepaid Expense and Other Assets [Abstract]
Investments in company-owned life insurance policies	$ 1,110	$ 944
Property and equipment, net	561	503
Lease ROU assets	560	480
Prepaid expenses	209	173
Investments in FHLB and FRB stock	114	88
Client-owned fractional shares	98	78
All other	141	186
Total other assets	$ 2,793	$ 2,452