RESTRUCTURING COSTS - Schedule of Restructuring Reserve by Type of Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Restructuring Costs [Roll Forward]
Restructuring reserve, beginning balance	$ 87	$ 122
Expense	228	72	$ 75
Utilized/Paid	203	107
Restructuring reserve, ending balance	112	87	122
Severance and benefits
Restructuring Costs [Roll Forward]
Restructuring reserve, beginning balance	85	117
Expense	191	42
Utilized/Paid	171	74
Restructuring reserve, ending balance	105	85	117
Other
Restructuring Costs [Roll Forward]
Restructuring reserve, beginning balance	2	5
Expense	37	30
Utilized/Paid	32	33
Restructuring reserve, ending balance	$ 7	$ 2	$ 5