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VARIABLE INTEREST ENTITIES, Primary Beneficiary - Aggregate Assets and Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Sep. 30, 2025
Variable interest entity, consolidated, aggregate assets and liabilities [Abstract]    
Aggregate assets $ 94,237 $ 88,230
Aggregate liabilities 81,454 75,726
Variable Interest Entity, Primary Beneficiary    
Variable interest entity, consolidated, aggregate assets and liabilities [Abstract]    
Aggregate assets 314 93
Aggregate liabilities 175 39
Variable Interest Entity, Primary Beneficiary | LIHTC funds    
Variable interest entity, consolidated, aggregate assets and liabilities [Abstract]    
Aggregate assets 284 74
Aggregate liabilities 145 20
Variable Interest Entity, Primary Beneficiary | Restricted Stock Trust Fund    
Variable interest entity, consolidated, aggregate assets and liabilities [Abstract]    
Aggregate assets 30 19
Aggregate liabilities $ 30 $ 19