INCOME TAXES, Components of Income Excluding Noncontrolling Interests Before Provision for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
U.S. and foreign components of income before income taxes [Abstract]
U.S.	$ 1,019	$ 1,340	$ 1,268
Foreign	33	35	43
Pre-tax income	$ 1,052	$ 1,375	$ 1,311