Goodwill and Other Intangible Assets - Schedule of Changes in Carrying Amount of Goodwill (Details) $ in Millions	9 Months Ended
	Jun. 30, 2026 USD ($)
Goodwill
Balance at beginning of period	$ 3,839
Translation	(25)
Balance at end of period	3,814
Gross carrying value of goodwill	4,133
Accumulated impairment losses	(319)
Intelligent Devices
Goodwill
Balance at beginning of period	904
Translation	(11)
Balance at end of period	893
Gross carrying value of goodwill	893
Accumulated impairment losses	0
Software & Control
Goodwill
Balance at beginning of period	2,440
Translation	(9)
Balance at end of period	2,431
Gross carrying value of goodwill	2,431
Accumulated impairment losses	0
Lifecycle Services
Goodwill
Balance at beginning of period	495
Translation	(5)
Balance at end of period	490
Gross carrying value of goodwill	809
Accumulated impairment losses	$ (319)