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RESTRUCTURING COSTS - Schedule of Restructuring Reserve by Type of Cost (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			$ 120
Expense	$ 45	$ 21	53	$ 32
Utilized/Paid			66
Restructuring reserve, ending balance	107		107
Severance and benefits
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			116
Expense			46
Utilized/Paid			57
Restructuring reserve, ending balance	105		105
Other
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			4
Expense			7
Utilized/Paid			9
Restructuring reserve, ending balance	$ 2		$ 2