Other Financial Information (Goodwill) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Sep. 30, 2022
Goodwill [Line Items]
Goodwill	$ 14,097	$ 13,946
Measurement & Analytical Instrumentation [Member]
Goodwill [Line Items]
Goodwill	1,190	1,112
Final Control
Goodwill [Line Items]
Goodwill	2,676	2,605
Discrete Automation
Goodwill [Line Items]
Goodwill	843	807
Safety & Productivity [Member]
Goodwill [Line Items]
Goodwill	391	364
Intelligent Devices
Goodwill [Line Items]
Goodwill	5,100	4,888
AspenTech
Goodwill [Line Items]
Goodwill	8,327	8,326
Control Systems & Software
Goodwill [Line Items]
Goodwill	670	732
Software and Control
Goodwill [Line Items]
Goodwill	$ 8,997	$ 9,058

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 10
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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