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COLLATERALIZED AGREEMENTS AND FINANCINGS, Repurchase Agreements (Details) - Maturity overnight and continuous - USD ($)
$ in Millions
Jun. 30, 2026
Sep. 30, 2025
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements: $ 265 $ 325
Total collateralized financings 829 1,111
Government and agency obligations    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements: 82 125
Agency MBS and agency CMOs    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements: 183 200
Equity securities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities loaned: $ 564 $ 786