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FAIR VALUE, Financial Instruments Measured at Fair Value on a Nonrecurring Basis (Details) - Nonrecurring
$ in Millions
Jun. 30, 2026
USD ($)
Sep. 30, 2025
USD ($)
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]    
Loans held for sale $ 38 $ 31
Level 2    
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]    
Loans held for sale 38 31
Level 3    
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]    
Loans held for sale 0 0
Residential mortgage loans | Collateral or discounted cash flow    
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]    
Bank loans, net $ 8 $ 12
Residential mortgage loans | Collateral or discounted cash flow | Prepayment rate | Minimum    
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]    
Bank loans, net, measurement input 7 7
Residential mortgage loans | Collateral or discounted cash flow | Prepayment rate | Maximum    
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]    
Bank loans, net, measurement input 12 12
Residential mortgage loans | Collateral or discounted cash flow | Prepayment rate | Weighted average    
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]    
Bank loans, net, measurement input 10.6 10.5
Residential mortgage loans | Level 2 | Collateral or discounted cash flow    
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]    
Bank loans, net $ 1 $ 5
Residential mortgage loans | Level 3 | Collateral or discounted cash flow    
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]    
Bank loans, net 7 7
Corporate loans | Collateral or discounted cash flow    
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]    
Bank loans, net $ 133 $ 179
Corporate loans | Collateral or discounted cash flow | Recovery rate | Minimum    
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]    
Bank loans, net, measurement input 0.38 0.24
Corporate loans | Collateral or discounted cash flow | Recovery rate | Maximum    
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]    
Bank loans, net, measurement input 0.87 0.96
Corporate loans | Collateral or discounted cash flow | Recovery rate | Weighted average    
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]    
Bank loans, net, measurement input 0.70 0.76
Corporate loans | Level 2 | Collateral or discounted cash flow    
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]    
Bank loans, net $ 0 $ 0
Corporate loans | Level 3 | Collateral or discounted cash flow    
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]    
Bank loans, net $ 133 $ 179