INCOME TAXES, Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Income tax penalties and interest accrued	$ 9	$ 7
Changes in the liability for unrecognized tax benefits [Roll Forward]
Uncertain tax positions beginning of year	36	45	$ 42
Increases for tax positions related to the current year	5	5	5
Increases for tax positions related to prior years	10	2	3
Decreases for tax positions related to prior years	(1)	(7)	(1)
Decreases due to lapsed statute of limitations	(7)	(5)	(4)
Decreases related to settlements	0	(4)	0
Uncertain tax positions end of year	43	36	45
Unrecognized tax benefits that would impact effective tax rate	38	$ 31	$ 40
Decrease in unrecognized tax benefits is reasonably possible	$ 11