BUSINESS SEGMENTS - Schedule of Depreciation & Amortization (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025	Sep. 30, 2025
Segment Reporting Information [Line Items]
Assets	$ 42,088		$ 42,088		$ 41,964
Depreciation and amortization	369	$ 384	728	$ 767
Software & Systems
Segment Reporting Information [Line Items]
Assets	24,517		24,517		24,757
Depreciation and amortization	245	267	486	534
Intelligent Devices
Segment Reporting Information [Line Items]
Assets	11,962		11,962		11,858
Depreciation and amortization	92	88	181	174
Operating Segments \| Safety & Productivity
Segment Reporting Information [Line Items]
Assets	1,922		1,922		1,931
Depreciation and amortization	19	18	39	37
Operating Segments \| Software & Systems \| Control Systems & Software
Segment Reporting Information [Line Items]
Assets	8,673		8,673		8,809
Depreciation and amortization	125	148	246	297
Operating Segments \| Software & Systems \| Test & Measurement
Segment Reporting Information [Line Items]
Assets	15,844		15,844		15,948
Depreciation and amortization	120	119	240	237
Operating Segments \| Intelligent Devices \| Sensors
Segment Reporting Information [Line Items]
Assets	4,303		4,303		4,253
Depreciation and amortization	34	32	67	62
Operating Segments \| Intelligent Devices \| Final Control
Segment Reporting Information [Line Items]
Assets	7,659		7,659		7,605
Depreciation and amortization	58	56	114	112
Corporate
Segment Reporting Information [Line Items]
Assets	3,687		3,687		$ 3,418
Depreciation and amortization	$ 13	$ 11	$ 22	$ 22