GOODWILL AND OTHER INTANGIBLES - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$ 1,174	$ 1,366	$ 764
Future amortization expense, 2026	1,110
Future amortization expense, 2027	1,076
Future amortization expense, 2028	1,030
Future amortization expense, 2029	977
Future amortization expense, 2030	$ 940