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RESTRUCTURING COSTS - Schedule of Restructuring Reserve by Type of Cost (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			$ 112
Expense	$ 37	$ 57	70	$ 170
Utilized/Paid			101
Restructuring reserve, ending balance	81		81
Severance and benefits
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			105
Expense			58
Utilized/Paid			87
Restructuring reserve, ending balance	76		76
Other
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			7
Expense			12
Utilized/Paid			14
Restructuring reserve, ending balance	$ 5		$ 5