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Business Segments Information - Financial Information by Geographic Area (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales, excluding intersegment eliminations |  |  |  |  |  |  |  |  | $ 15,236 | $ 13,890 | $ 13,020
Sales | $ 4,090 | $ 3,946 | $ 3,756 | $ 3,373 | $ 3,892 | $ 3,465 | $ 3,291 | $ 3,156 | 15,165 | 13,804 | 12,932
Property, Plant and Equipment | 2,363 |  |  |  | 2,239 |  |  |  | 2,363 | 2,239 | 2,444
Americas |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales, excluding intersegment eliminations |  |  |  |  |  |  |  |  | 7,808 | 7,041 | 6,160
Property, Plant and Equipment | 1,442 |  |  |  | 1,373 |  |  |  | 1,442 | 1,373 | 1,422
AMEA |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales, excluding intersegment eliminations |  |  |  |  |  |  |  |  | 4,597 | 4,260 | 4,113
Property, Plant and Equipment | 428 |  |  |  | 398 |  |  |  | 428 | 398 | 448
Europe |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales, excluding intersegment eliminations |  |  |  |  |  |  |  |  | 2,831 | 2,589 | 2,747
Property, Plant and Equipment | $ 493 |  |  |  | $ 468 |  |  |  | 493 | 468 | 574
Intelligent Devices |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales, excluding intersegment eliminations |  |  |  |  |  |  |  |  | 11,588 | 10,836 | 10,380
Sales |  |  |  |  |  |  |  |  | 11,588 | 10,836 | 10,380
Intelligent Devices | Americas |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales, excluding intersegment eliminations |  |  |  |  |  |  |  |  | 6,079 | 5,509 | 4,918
Intelligent Devices | AMEA |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales, excluding intersegment eliminations |  |  |  |  |  |  |  |  | 3,493 | 3,375 | 3,332
Intelligent Devices | Europe |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales, excluding intersegment eliminations |  |  |  |  |  |  |  |  | 2,016 | 1,952 | 2,130
Intelligent Devices | Operating Segments | Measurement & Analytical |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales, excluding intersegment eliminations |  |  |  |  |  |  |  |  | 3,595 | 3,215 | 3,078
Sales |  |  |  |  |  |  |  |  | 3,595 | 3,215 | 3,078
Intelligent Devices | Operating Segments | Measurement & Analytical | Americas |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales, excluding intersegment eliminations |  |  |  |  |  |  |  |  | 1,847 | 1,529 | 1,338
Intelligent Devices | Operating Segments | Measurement & Analytical | AMEA |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales, excluding intersegment eliminations |  |  |  |  |  |  |  |  | 1,222 | 1,199 | 1,181
Intelligent Devices | Operating Segments | Measurement & Analytical | Europe |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales, excluding intersegment eliminations |  |  |  |  |  |  |  |  | 526 | 487 | 559
Intelligent Devices | Operating Segments | Final Control |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales, excluding intersegment eliminations |  |  |  |  |  |  |  |  | 3,970 | 3,607 | 3,488
Sales |  |  |  |  |  |  |  |  | 3,970 | 3,607 | 3,488
Intelligent Devices | Operating Segments | Final Control | Americas |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales, excluding intersegment eliminations |  |  |  |  |  |  |  |  | 1,949 | 1,706 | 1,504
Intelligent Devices | Operating Segments | Final Control | AMEA |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales, excluding intersegment eliminations |  |  |  |  |  |  |  |  | 1,481 | 1,373 | 1,385
Intelligent Devices | Operating Segments | Final Control | Europe |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales, excluding intersegment eliminations |  |  |  |  |  |  |  |  | 540 | 528 | 599
Intelligent Devices | Operating Segments | Discrete Automation |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales, excluding intersegment eliminations |  |  |  |  |  |  |  |  | 2,635 | 2,612 | 2,474
Sales |  |  |  |  |  |  |  |  | 2,635 | 2,612 | 2,474
Intelligent Devices | Operating Segments | Discrete Automation | Americas |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales, excluding intersegment eliminations |  |  |  |  |  |  |  |  | 1,234 | 1,217 | 1,084
Intelligent Devices | Operating Segments | Discrete Automation | AMEA |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales, excluding intersegment eliminations |  |  |  |  |  |  |  |  | 720 | 732 | 700
Intelligent Devices | Operating Segments | Discrete Automation | Europe |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales, excluding intersegment eliminations |  |  |  |  |  |  |  |  | 681 | 663 | 690
Intelligent Devices | Operating Segments | Safety & Productivity |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales, excluding intersegment eliminations |  |  |  |  |  |  |  |  | 1,388 | 1,402 | 1,340
Sales |  |  |  |  |  |  |  |  | 1,388 | 1,402 | 1,340
Intelligent Devices | Operating Segments | Safety & Productivity | Americas |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales, excluding intersegment eliminations |  |  |  |  |  |  |  |  | 1,049 | 1,057 | 992
Intelligent Devices | Operating Segments | Safety & Productivity | AMEA |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales, excluding intersegment eliminations |  |  |  |  |  |  |  |  | 70 | 71 | 66
Intelligent Devices | Operating Segments | Safety & Productivity | Europe |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales, excluding intersegment eliminations |  |  |  |  |  |  |  |  | 269 | 274 | 282
Software and Control |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales, excluding intersegment eliminations |  |  |  |  |  |  |  |  | 3,648 | 3,054 | 2,640
Sales |  |  |  |  |  |  |  |  | 3,648 | 3,054 | 2,640
Software and Control | Americas |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales, excluding intersegment eliminations |  |  |  |  |  |  |  |  | 1,729 | 1,532 | 1,242
Software and Control | AMEA |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales, excluding intersegment eliminations |  |  |  |  |  |  |  |  | 1,104 | 885 | 781
Software and Control | Europe |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales, excluding intersegment eliminations |  |  |  |  |  |  |  |  | 815 | 637 | 617
Software and Control | Operating Segments | AspenTech |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales, excluding intersegment eliminations |  |  |  |  |  |  |  |  | 1,042 | 656 | 319
Sales |  |  |  |  |  |  |  |  | 1,042 | 656 | 319
Software and Control | Operating Segments | AspenTech | Americas |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales, excluding intersegment eliminations |  |  |  |  |  |  |  |  | 470 | 362 | 200
Software and Control | Operating Segments | AspenTech | AMEA |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales, excluding intersegment eliminations |  |  |  |  |  |  |  |  | 286 | 140 | 60
Software and Control | Operating Segments | AspenTech | Europe |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales, excluding intersegment eliminations |  |  |  |  |  |  |  |  | 286 | 154 | 59
Software and Control | Operating Segments | Control Systems & Software |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales, excluding intersegment eliminations |  |  |  |  |  |  |  |  | 2,606 | 2,398 | 2,321
Sales |  |  |  |  |  |  |  |  | 2,606 | 2,398 | 2,321
Software and Control | Operating Segments | Control Systems & Software | Americas |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales, excluding intersegment eliminations |  |  |  |  |  |  |  |  | 1,259 | 1,170 | 1,042
Software and Control | Operating Segments | Control Systems & Software | AMEA |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales, excluding intersegment eliminations |  |  |  |  |  |  |  |  | 818 | 745 | 721
Software and Control | Operating Segments | Control Systems & Software | Europe |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales, excluding intersegment eliminations |  |  |  |  |  |  |  |  | $ 529 | $ 483 | $ 558

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