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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, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			$ 120
Expense	$ 87	$ 37	141	$ 70
Utilized/Paid			103
Restructuring reserve, ending balance	158		158
Severance and benefits
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			116
Expense			123
Utilized/Paid			83
Restructuring reserve, ending balance	156		156
Other
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			4
Expense			18
Utilized/Paid			20
Restructuring reserve, ending balance	$ 2		$ 2