RESTRUCTURING COSTS - Schedule of Restructuring Reserve by Type of Cost (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	$ 120
Expense	9	$ 11
Utilized/Paid	31
Restructuring reserve, ending balance	98
Severance and benefits
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	116
Expense	4
Utilized/Paid	25
Restructuring reserve, ending balance	95
Other
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	4
Expense	5
Utilized/Paid	6
Restructuring reserve, ending balance	$ 3