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INTEREST INCOME AND INTEREST EXPENSE
 9 Months Ended
Jun. 30, 2020
Interest Income (Expense), Net [Abstract]  
INTEREST INCOME AND INTEREST EXPENSE INTEREST INCOME AND INTEREST EXPENSE
The following table details the components of interest income and interest expense.
 Three months ended June 30,Nine months ended June 30,
$ in millions2020201920202019
Interest income:  
Assets segregated pursuant to regulations$3  $14  $25  $46  
Trading instruments
4  7  17  20  
Available-for-sale securities
23  18  60  51  
Margin loans
18  30  66  93  
Bank loans, net of unearned income and deferred expenses
157  221  561  655  
Loans to financial advisors
5  5  15  14  
Corporate cash and all other
7  26  55  82  
Total interest income
$217  $321  $799  $961  
Interest expense:  
Bank deposits
$7  $33  $35  $105  
Trading instruments sold but not yet purchased
1  2  3  6  
Brokerage client payables
3  5  9  16  
Other borrowings
5  5  15  16  
Senior notes payable
24  19  61  55  
Other
2  9  13  23  
Total interest expense
42  73  136  221  
Net interest income175  248  663  740  
Bank loan loss (provision)/benefit(81) 5  (188) (16) 
Net interest income after bank loan loss (provision)/benefit$94  $253  $475  $724  

Interest expense related to bank deposits in the preceding table excludes interest expense associated with affiliate deposits, which has been eliminated in consolidation.