STOCK-BASED COMPENSATION - Schedule of Cash Proceeds Received and Tax Benefit from Share-based Payment Awards, Options (Details) - Employee Stock Option - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash received for option exercises	$ 14	$ 49	$ 15
Intrinsic value of options exercised	15	27	11
Tax benefits related to option exercises	$ 5	$ 4	$ 7