Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details

Business Segments Geographic Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Net sales	$ 5,005	$ 4,697	$ 14,269	$ 13,289
Reportable Geographical Components [Member]
Disaggregation of Revenue [Line Items]
Net sales	5,013	4,704	14,286	13,310
Reportable Geographical Components [Member] \| Americas
Disaggregation of Revenue [Line Items]
Net sales	2,911	2,511	7,965	7,001
Reportable Geographical Components [Member] \| Asia, Middle East & Africa
Disaggregation of Revenue [Line Items]
Net sales	1,300	1,342	3,960	3,851
Reportable Geographical Components [Member] \| Europe [Member]
Disaggregation of Revenue [Line Items]
Net sales	802	851	2,361	2,458
Reportable Geographical Components [Member] \| Automation Solutions [Member]
Disaggregation of Revenue [Line Items]
Net sales	2,872	2,865	8,451	8,193
Reportable Geographical Components [Member] \| Automation Solutions [Member] \| Americas
Disaggregation of Revenue [Line Items]
Net sales	1,418	1,269	3,942	3,561
Reportable Geographical Components [Member] \| Automation Solutions [Member] \| Asia, Middle East & Africa
Disaggregation of Revenue [Line Items]
Net sales	929	997	2,894	2,861
Reportable Geographical Components [Member] \| Automation Solutions [Member] \| Europe [Member]
Disaggregation of Revenue [Line Items]
Net sales	525	599	1,615	1,771
Reportable Geographical Components [Member] \| AspenTech
Disaggregation of Revenue [Line Items]
Net sales	239	82	405	239
Reportable Geographical Components [Member] \| AspenTech \| Americas
Disaggregation of Revenue [Line Items]
Net sales	131	52	234	150
Reportable Geographical Components [Member] \| AspenTech \| Asia, Middle East & Africa
Disaggregation of Revenue [Line Items]
Net sales	50	14	85	46
Reportable Geographical Components [Member] \| AspenTech \| Europe [Member]
Disaggregation of Revenue [Line Items]
Net sales	58	16	86	43
Reportable Geographical Components [Member] \| Commercial & Residential Solutions [Member]
Disaggregation of Revenue [Line Items]
Net sales	1,902	1,757	5,430	4,878
Reportable Geographical Components [Member] \| Commercial & Residential Solutions [Member] \| Americas
Disaggregation of Revenue [Line Items]
Net sales	1,362	1,190	3,789	3,290
Reportable Geographical Components [Member] \| Commercial & Residential Solutions [Member] \| Asia, Middle East & Africa
Disaggregation of Revenue [Line Items]
Net sales	321	331	981	944
Reportable Geographical Components [Member] \| Commercial & Residential Solutions [Member] \| Europe [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 219	$ 236	$ 660	$ 644