v3.25.2
FAIR VALUE, Carrying Amounts and Estimated Fair Value of Financial Instruments not Recorded on Balance Sheet (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Sep. 30, 2024
Carrying amount    
Financial assets:    
Bank loans, net $ 49,661 $ 45,879
Financial liabilities:    
Bank deposits - certificates of deposit 1,785 2,612
Carrying amount | Other borrowings - subordinated notes payable    
Financial liabilities:    
Debt 99 99
Carrying amount | Senior notes payable    
Financial liabilities:    
Debt 2,040 2,040
Recurring | Total Estimated Fair Value    
Financial assets:    
Bank loans, net 49,123 45,185
Financial liabilities:    
Bank deposits - certificates of deposit 1,788 2,623
Recurring | Total Estimated Fair Value | Other borrowings - subordinated notes payable    
Financial liabilities:    
Debt 98 97
Recurring | Total Estimated Fair Value | Senior notes payable    
Financial liabilities:    
Debt 1,774 1,874
Recurring | Level 2 | Total Estimated Fair Value    
Financial assets:    
Bank loans, net 217 183
Financial liabilities:    
Bank deposits - certificates of deposit 1,788 2,623
Recurring | Level 2 | Total Estimated Fair Value | Other borrowings - subordinated notes payable    
Financial liabilities:    
Debt 98 97
Recurring | Level 2 | Total Estimated Fair Value | Senior notes payable    
Financial liabilities:    
Debt 1,774 1,874
Recurring | Level 3 | Total Estimated Fair Value    
Financial assets:    
Bank loans, net 48,906 45,002
Financial liabilities:    
Bank deposits - certificates of deposit 0 0
Recurring | Level 3 | Total Estimated Fair Value | Other borrowings - subordinated notes payable    
Financial liabilities:    
Debt 0 0
Recurring | Level 3 | Total Estimated Fair Value | Senior notes payable    
Financial liabilities:    
Debt $ 0 $ 0