RESTRUCTURING COSTS - Schedule of Restructuring Reserve by Type of Cost (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	$ 112
Expense	11	$ 83
Utilized/Paid	28
Restructuring reserve, ending balance	95
Severance and benefits
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	105
Expense	9
Utilized/Paid	26
Restructuring reserve, ending balance	88
Other
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	7
Expense	2
Utilized/Paid	2
Restructuring reserve, ending balance	$ 7