RESTRUCTURING COSTS - Schedule of Restructuring Reserve by Type of Cost (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			$ 87
Expense	$ 30	$ 19	113	$ 29
Utilized/Paid			115
Restructuring reserve, ending balance	85		85
Severance and benefits
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			85
Expense			95
Utilized/Paid			100
Restructuring reserve, ending balance	80		80
Other
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			2
Expense			18
Utilized/Paid			15
Restructuring reserve, ending balance	$ 5		$ 5