COMMITMENTS, CONTINGENCIES AND GUARANTEES, Summary of Off-Balance Sheet Risks (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
SBL and other consumer lines of credit	$ 44,057	$ 38,791
Commercial lines of credit	4,630	4,131
Unfunded lending commitments	640	936
Standby letters of credit	$ 111	$ 123