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COMMITMENTS, CONTINGENCIES AND GUARANTEES, Summary of Off-Balance Sheet Risks (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Sep. 30, 2025
Commitments and Contingencies Disclosure [Abstract]    
SBL and other consumer lines of credit $ 68,139 $ 56,048
Commercial lines of credit 5,150 5,441
Unfunded lending commitments 534 716
Standby letters of credit $ 234 $ 217