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INTEREST INCOME AND INTEREST EXPENSE (Tables)
 3 Months Ended
Dec. 31, 2020
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 millions20202019
Interest income:  
Cash and cash equivalents$4 $17 
Assets segregated pursuant to regulations3 11 
Available-for-sale securities
23 18 
Brokerage client receivables18 27 
Bank loans, net of unearned income and deferred expenses
145 206 
All other10 18 
Total interest income
$203 $297 
Interest expense:  
Bank deposits
$6 $16 
Brokerage client payables
1 3 
Other borrowings
5 5 
Senior notes payable
24 18 
All other2 9 
Total interest expense
38 51 
Net interest income165 246 
Bank loan (provision)/benefit for credit losses(14)2 
Net interest income after bank loan (provision)/benefit for credit losses$151 $248