RESTRUCTURING COSTS - Schedule of Restructuring Reserve by Type of Cost (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			$ 87
Expense	$ 57	$ 12	170	$ 41
Utilized/Paid			153
Restructuring reserve, ending balance	104		104
Severance and benefits
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			85
Expense			142
Utilized/Paid			129
Restructuring reserve, ending balance	98		98
Other
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			2
Expense			28
Utilized/Paid			24
Restructuring reserve, ending balance	$ 6		$ 6