Other Financial Information - Schedule of Goodwill by Business Segment (Details) - USD ($) $ in Millions	Dec. 31, 2023	Sep. 30, 2023
Goodwill [Line Items]
Goodwill	$ 17,983	$ 14,480
Intelligent Devices
Goodwill [Line Items]
Goodwill	5,564	5,485
Software and Control
Goodwill [Line Items]
Goodwill	12,419	8,995
Final Control | Intelligent Devices
Goodwill [Line Items]
Goodwill	2,687	2,660
Measurement & Analytical | Intelligent Devices
Goodwill [Line Items]
Goodwill	1,568	1,545
Discrete Automation | Intelligent Devices
Goodwill [Line Items]
Goodwill	910	892
Safety & Productivity | Intelligent Devices
Goodwill [Line Items]
Goodwill	399	388
Control Systems & Software | Software and Control
Goodwill [Line Items]
Goodwill	672	668
Test & Measurement | Software and Control
Goodwill [Line Items]
Goodwill	3,418	0
AspenTech | Software and Control
Goodwill [Line Items]
Goodwill	$ 8,329	$ 8,327