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INTEREST INCOME AND INTEREST EXPENSE (Tables)
 3 Months Ended
Dec. 31, 2021
Interest Income (Expense), Net [Abstract]  
Interest Income and Interest Expense
The following table details the components of interest income and interest expense.
 Three months ended December 31,
$ in millions20212020
Interest income:  
Cash and cash equivalents$3 $4 
Assets segregated for regulatory purposes and restricted cash4 3 
Available-for-sale securities
22 23 
Brokerage client receivables21 18 
Bank loans, net of unearned income and deferred expenses
164 145 
All other11 10 
Total interest income
$225 $203 
Interest expense:  
Bank deposits
$6 $6 
Brokerage client payables
1 1 
Other borrowings
5 5 
Senior notes payable
23 24 
All other2 2 
Total interest expense
37 38 
Net interest income188 165 
Bank loan (provision)/benefit for credit losses11 (14)
Net interest income after bank loan (provision)/benefit for credit losses$199 $151