Basis of Presentation and Accounting Policies - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Reconciled Basic and Diluted EPS
Net income attributable to Rockwell Automation, Inc.	$ 408	$ 295	$ 1,063	$ 731
Less: Allocation to participating securities	(1)	(1)	(3)	(3)
Net income available to common shareowners	$ 407	$ 294	$ 1,060	$ 728
Basic weighted average outstanding shares (in shares)	111.1	112.5	111.8	112.8
Effect of dilutive securities
Stock options (in shares)	0.5	0.4	0.5	0.4
Performance shares (in shares)	0.0	0.1	0.0	0.0
Diluted weighted average outstanding shares (in shares)	111.6	113.0	112.3	113.2
Earnings per share:
Basic (in usd per share)	$ 3.66	$ 2.61	$ 9.48	$ 6.45
Diluted (in usd per share)	$ 3.65	$ 2.60	$ 9.44	$ 6.43