INTEREST INCOME AND INTEREST EXPENSE (Tables)

12 Months Ended

Sep. 30, 2020

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	2020		2019		2018
Interest income:
Assets segregated pursuant to regulations	$	28	$	59	$	53
Trading instruments	20		26		23
Available-for-sale securities	83		69		52
Margin loans	84		122		107
Bank loans, net of unearned income and deferred expenses	702		871		722
Loans to financial advisors	20		18		15
Corporate cash and all other	63		116		72
Total interest income	1,000		1,281		1,044
Interest expense:
Bank deposits	41		132		66
Trading instruments sold but not yet purchased	3		7		7
Brokerage client payables	11		21		15
Other borrowings	20		21		22
Senior notes payable	85		73		73
Other	18		29		19
Total interest expense	178		283		202
Net interest income	822		998		842
Bank loan loss provision	(233)		(22)		(20)
Net interest income after bank loan loss provision	$	589	$	976	$	822