OTHER ASSETS (Details) - USD ($) $ in Millions	Jun. 30, 2024	Sep. 30, 2023
Prepaid Expense and Other Assets [Abstract]
Investments in company-owned life insurance policies	$ 1,330	$ 1,110
Property and equipment, net	618	561
Lease right-of-use (“ROU”) assets	562	560
Prepaid expenses	236	209
Investments in FHLB and FRB stock	114	114
Client-owned fractional shares	124	98
All other	238	141
Total other assets	$ 3,222	$ 2,793