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Business Segments (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2023 | Mar. 31, 2022
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 3,756 | $ 3,291 | $ 7,129 | $ 6,447
Earnings | 639 | 509 | 1,061 | 1,451
Gain from periodic distribution from retained subordinated interest in Vertiv (VRT) | 0 | 0 | 0 | 453
Interest expense | (53) | (51) | (101) | (90)
Operating Segments [Member] | Measurement & Analytical Instrumentation [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 888 | 769 | 1,637 | 1,506
Earnings | 229 | 176 | 404 | 346
Operating Segments [Member] | Final Control |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 992 | 884 | 1,854 | 1,701
Earnings | 215 | 152 | 373 | 274
Operating Segments [Member] | Discrete Automation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 683 | 644 | 1,301 | 1,261
Earnings | 133 | 130 | 254 | 250
Operating Segments [Member] | Safety & Productivity [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 361 | 355 | 671 | 706
Earnings | 83 | 65 | 146 | 130
Operating Segments [Member] | Intelligent Devices |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 2,924 | 2,652 | 5,463 | 5,174
Earnings | 660 | 523 | 1,177 | 1,000
Operating Segments [Member] | AspenTech |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 230 | 84 | 473 | 166
Earnings | (54) | (4) | (87) | (6)
Operating Segments [Member] | Control Systems & Software |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 623 | 573 | 1,229 | 1,143
Earnings | 127 | 101 | 234 | 217
Operating Segments [Member] | Software and Control |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 853 | 657 | 1,702 | 1,309
Earnings | 73 | 97 | 147 | 211
Segment Reconciling Items [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Stock compensation | (40) | (43) | (142) | (77)
Unallocated pension and postretirement costs | 46 | 25 | 91 | 51
Gain from periodic distribution from retained subordinated interest in Vertiv (VRT) | 0 | 0 | 0 | 453
Corporate and other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earnings | (47) | (42) | (111) | (97)
Intersegment Eliminations [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (21) | (18) | (36) | (36)
Interest expense | $ (53) | $ (51) | $ (101) | $ (90)

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