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LONG-TERM DEBT- Narrative (Details) - USD ($) $ in Millions	12 Months Ended
LONG-TERM DEBT- Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Debt Instrument [Line Items]
Long-term debt, maturing in 2025	$ 562
Long-term debt, maturing in 2026	760
Long-term debt, maturing in 2027	497
Long-term debt, maturing in 2028	998
Interest paid on long-term debt	193	$ 200	$ 199
Repayments of long-term debt	547	741	$ 522
0.375% euro notes due May 2024 \| Notes Payable
Debt Instrument [Line Items]
Repayments of long-term debt	$ 529
Notes interest rate, percentage	0.375%
2.625% notes Feb 2023 \| Notes Payable
Debt Instrument [Line Items]
Repayments of long-term debt		$ 500
Notes interest rate, percentage		2.625%
2.625% notes Feb 2023 \| Notes Payable \| AspenTech
Debt Instrument [Line Items]
Repayments of long-term debt	$ 264