RESTRUCTURING COSTS - Schedule of Restructuring Reserve by Type of Cost (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			$ 112
Expense	$ 21	$ 30	32	$ 113
Utilized/Paid			54
Restructuring reserve, ending balance	90		90
Severance and benefits
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			105
Expense			26
Utilized/Paid			46
Restructuring reserve, ending balance	85		85
Other
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			7
Expense			6
Utilized/Paid			8
Restructuring reserve, ending balance	$ 5		$ 5