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VARIABLE INTEREST ENTITIES, Not the Primary Beneficiary - Aggregate Assets, Liabilities Exposure to Loss (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Sep. 30, 2025
Variable Interest Entity [Line Items]    
Aggregate assets $ 94,237 $ 88,230
Aggregate liabilities 81,454 75,726
Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Aggregate assets 14,268 13,319
Aggregate liabilities 4,248 4,196
Our risk of loss 326 353
Variable Interest Entity, Not Primary Beneficiary | LIHTC    
Variable Interest Entity [Line Items]    
Aggregate assets 10,222 9,680
Aggregate liabilities 3,028 3,031
Our risk of loss 77 133
Variable Interest Entity, Not Primary Beneficiary | Private Equity Interests    
Variable Interest Entity [Line Items]    
Aggregate assets 3,216 3,043
Aggregate liabilities 976 948
Our risk of loss 112 105
Variable Interest Entity, Not Primary Beneficiary | Other    
Variable Interest Entity [Line Items]    
Aggregate assets 830 596
Aggregate liabilities 244 217
Our risk of loss $ 137 $ 115