BUSINESS SEGMENTS INFORMATION - Schedule of Segment Reporting Information, by Segment (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Net sales	$ 4,855	$ 4,553	$ 4,432	$ 4,175	$ 4,619	$ 4,380	$ 4,376	$ 4,117	$ 18,016	$ 17,492	$ 15,165
Selling, general and administrative expenses									5,103	5,142	4,186
Other deductions, net									1,245	1,434	506
Earnings before income taxes									2,934	2,020	2,903
Stock compensation									265	260	271
Gain on subordinated interest									0	79	161
Eliminations/Interest									(237)	(175)	(34)
Operating Segments
Segment Reporting Information [Line Items]
Net sales									18,091	17,560	15,236
Earnings before income taxes									3,780	3,089	3,038
Segment Reconciling
Segment Reporting Information [Line Items]
Stock compensation									(263)	(260)	(250)
Unallocated pension and postretirement costs									109	144	171
Loss on Copeland note receivable									0	(279)	0
Gain on subordinated interest									0	79	161
Segment Reconciling | Related Party
Segment Reporting Information [Line Items]
Interest income from related party									0	86	41
Corporate and other
Segment Reporting Information [Line Items]
Earnings before income taxes									(455)	(664)	(224)
Eliminations/Interest
Segment Reporting Information [Line Items]
Net sales									(75)	(68)	(71)
Eliminations/Interest									(237)	(175)	(34)
Intelligent Devices | Operating Segments
Segment Reporting Information [Line Items]
Net sales									12,400	12,161	11,588
Cost of sales									6,279	6,175	6,007
Selling, general and administrative expenses									2,879	2,864	2,750
Other deductions, net									289	315	215
Earnings before income taxes									2,953	2,807	2,616
Intelligent Devices | Operating Segments | Final Control
Segment Reporting Information [Line Items]
Net sales									4,380	4,204	3,970
Cost of sales									2,323	2,246	2,177
Selling, general and administrative expenses									869	862	829
Other deductions, net									107	119	99
Earnings before income taxes									1,081	977	865
Intelligent Devices | Operating Segments | Measurement & Analytical
Segment Reporting Information [Line Items]
Net sales									4,143	4,061	3,595
Cost of sales									1,843	1,799	1,648
Selling, general and administrative expenses									1,101	1,097	972
Other deductions, net									87	109	39
Earnings before income taxes									1,112	1,056	936
Intelligent Devices | Operating Segments | Discrete Automation
Segment Reporting Information [Line Items]
Net sales									2,521	2,506	2,635
Cost of sales									1,340	1,334	1,387
Selling, general and administrative expenses									645	640	680
Other deductions, net									67	66	59
Earnings before income taxes									469	466	509
Intelligent Devices | Operating Segments | Safety & Productivity
Segment Reporting Information [Line Items]
Net sales									1,356	1,390	1,388
Cost of sales									773	796	795
Selling, general and administrative expenses									264	265	269
Other deductions, net									28	21	18
Earnings before income taxes									291	308	306
Software & Control | Operating Segments
Segment Reporting Information [Line Items]
Net sales									5,691	5,399	3,648
Cost of sales									2,298	2,270	1,818
Selling, general and administrative expenses									1,807	1,841	1,058
Other deductions, net									759	1,006	350
Earnings before income taxes									827	282	422
Software & Control | Operating Segments | Control Systems & Software
Segment Reporting Information [Line Items]
Net sales									4,205	3,935	3,648
Cost of sales									1,917	1,883	1,818
Selling, general and administrative expenses									1,073	1,118	1,058
Other deductions, net									320	362	350
Earnings before income taxes									895	572	422
Software & Control | Operating Segments | Test & Measurement
Segment Reporting Information [Line Items]
Net sales									1,486	1,464	0
Cost of sales									381	387	0
Selling, general and administrative expenses									734	723	0
Other deductions, net									439	644	0
Earnings before income taxes									$ (68)	$ (290)	$ 0