INTEREST INCOME AND INTEREST EXPENSE (Tables)

12 Months Ended

Sep. 30, 2021

Interest Income (Expense), Net [Abstract]

Interest Income and Interest Expense

The following table details the components of interest income and interest expense.

	Year ended September 30,
$ in millions	2021		2020		2019
Interest income:
Cash and cash equivalents	$	12	$	41	$	83
Assets segregated for regulatory purposes and restricted cash	15		28		59
Available-for-sale securities	85		83		69
Brokerage client receivables	77		84		122
Bank loans, net of unearned income and deferred expenses	593		702		871
All other	41		62		77
Total interest income	823		1,000		1,281
Interest expense:
Bank deposits	23		41		132
Brokerage client payables	3		11		21
Other borrowings	19		20		21
Senior notes payable	96		85		73
All other	9		21		36
Total interest expense	150		178		283
Net interest income	673		822		998
Bank loan (provision)/benefit for credit losses	32		(233)		(22)
Net interest income after bank loan (provision)/benefit for credit losses	$	705	$	589	$	976