FINANCIAL INSTRUMENTS - Narrative (Details) $ / shares in Units, € in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2024 EUR (€)	Sep. 30, 2023 USD ($)	Sep. 30, 2025 USD ($)	Mar. 31, 2025 EUR (€)	Sep. 30, 2024 USD ($)	Apr. 12, 2023 $ / shares	Sep. 30, 2019 EUR (€)
Derivative [Line Items]
Mark-to-market gain		$ 24
Level 2
Derivative [Line Items]
Fair value of long-term debt			$ 8,200		$ 7,000
Fair value of long term debt compared with carrying value			693		$ 705
National Instruments
Derivative [Line Items]
Business acquisition, purchase price per share (in dollars per share) | $ / shares						$ 60
National Instruments
Derivative [Line Items]
Mark-to-market gain		$ 56
Senior Notes
Derivative [Line Items]
Debt, face amount | €							€ 1,500
Repayments of debt | €	€ 500
Senior Notes | Three Point Zero Percentage Due Two Thousand Thirty One
Derivative [Line Items]
Debt, face amount | €				€ 500
Notes interest rate, percentage				3.00%
Senior Notes | Three Point Five Percentage Due Two Thousand Thirty Siven
Derivative [Line Items]
Debt, face amount | €				€ 500
Notes interest rate, percentage				3.50%
Foreign currency
Derivative [Line Items]
Notional value of hedge positions			$ 4,100