WEIGHTED-AVERAGE COMMON SHARES - Schedule Of Basic And Diluted Earnings Per Common Share Reconciliation (Details) - shares shares in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Basic shares outstanding (in shares)	564.0	571.3	574.2
Dilutive shares (in shares)	2.7	2.7	3.1
Diluted shares outstanding (in shares)	566.7	574.0	577.3