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Long-Term Debt (Details) - USD ($) $ in Millions	12 Months Ended
Long-Term Debt (Details) - USD ($) $ in Millions	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Debt Instrument [Line Items]
Long-term debt	$ 8,775	$ 6,331
Less: Current maturities	516	538
Total, net	8,259	5,793
Long-term debt maturing during year two	738
Long-term debt maturing during year three	527
Long-term debt maturing during year four	484
Long-term debt maturing during year five	745
Interest paid related to long-term debt	199	156	$ 163
Proceeds from issuance of debt	3,000
AspenTech [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 240
Debt Instrument, Interest Rate, Effective Percentage	4.31%
4.25% notes due November 2020 [Member]
Debt Instrument [Line Items]
Repayments of Debt		$ 300
Notes interest rate, percentage		4.25%
2.625% notes due December 2021 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 0	$ 500
Repayments of Debt	$ 500
Notes interest rate, percentage	2.625%
2.625% notes due February 2023 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 500	500
0.375% notes due May 2024 [Member]
Debt Instrument [Line Items]
Long-term debt	490	579
3.15% notes Due June 2025 [Member]
Debt Instrument [Line Items]
Long-term debt	500	500
1.25% notes due October 2025 [Member]
Debt Instrument [Line Items]
Long-term debt	490	579
0.875% Notes Due October 2026 [Member]
Debt Instrument [Line Items]
Long-term debt	750	750
1.8% Notes Due October 2027 [Member]
Debt Instrument [Line Items]
Long-term debt	500	500
2.0% Notes Due December 2028
Debt Instrument [Line Items]
Long-term debt	$ 1,000	0
Notes interest rate, percentage	2.00%
Proceeds from issuance of debt	$ 1,000
2.0% notes due October 2029 [Member]
Debt Instrument [Line Items]
Long-term debt	490	579
1.95% Notes Due October 2030 [Member]
Debt Instrument [Line Items]
Long-term debt	500	500
2.20% Notes Due December 2031
Debt Instrument [Line Items]
Long-term debt	$ 1,000	0
Notes interest rate, percentage	2.20%
Proceeds from issuance of debt	$ 1,000
6.0% notes due August 2032 [Member]
Debt Instrument [Line Items]
Long-term debt	250	250
6.125% notes due April 2039 [Member]
Debt Instrument [Line Items]
Long-term debt	250	250
5.25% notes due November 2039 [Member]
Debt Instrument [Line Items]
Long-term debt	300	300
2.75% Notes Due October 2050 [Member
Debt Instrument [Line Items]
Long-term debt	500	500
2.80% Notes Due December 2051
Debt Instrument [Line Items]
Long-term debt	$ 1,000	0
Notes interest rate, percentage	2.80%
Proceeds from issuance of debt	$ 1,000
Other [Member]
Debt Instrument [Line Items]
Long-term debt	$ 255	$ 44