SHAREHOLDERS' EQUITY, Share Repurchases Narrative (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2024
Equity [Abstract]
Share repurchases, authorized amount				$ 1,500
Shares repurchased (in shares)	7.4	7.7	8.4
Shares repurchased	$ 1,100
Shares repurchased (in usd per share)	$ 148
Share repurchases, remaining authorized amount	$ 399