INCOME TAXES, Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Income tax penalties and interest accrued	$ 12	$ 9
Changes in the liability for unrecognized tax benefits [Roll Forward]
Uncertain tax positions beginning of year	43	36	$ 45
Increases for tax positions related to the current year	5	5	5
Increases for tax positions related to prior years	4	10	2
Decreases for tax positions related to prior years	(2)	(1)	(7)
Decreases due to lapsed statute of limitations	(8)	(7)	(5)
Decreases related to settlements	(1)	0	(4)
Uncertain tax positions end of year	41	43	36
Unrecognized tax benefits that would impact effective tax rate	35	$ 38	$ 31
Decrease in unrecognized tax benefits is reasonably possible	$ 6