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INTEREST INCOME AND INTEREST EXPENSE (Tables)
 12 Months Ended
Sep. 30, 2024
Interest Income (Expense), Operating [Abstract]  
Interest Income and Interest Expense
The following table details the components of interest income and interest expense.
 Year ended September 30,
$ in millions202420232022
Interest income:  
Cash and cash equivalents$509 $358 $48 
Assets segregated for regulatory purposes and restricted cash183 197 96 
Trading assets — debt securities73 57 27 
Available-for-sale securities220 219 136 
Brokerage client receivables187 170 100 
Bank loans, net2,952 2,671 1,051 
All other108 76 50 
Total interest income
4,232 3,748 1,508 
Interest expense:   
Bank deposits1,780 1,080 131 
Trading liabilities — debt securities44 36 12 
Brokerage client payables
83 78 24 
Other borrowings
30 37 21 
Senior notes payable
92 92 93 
All other73 50 24 
Total interest expense
2,102 1,373 305 
Net interest income2,130 2,375 1,203 
Less: Bank loan provision for credit losses
45 132 100 
Net interest income after bank loan provision for credit losses
$2,085 $2,243 $1,103