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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

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