Business Segment Information Product Line Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Net sales	$ 4,570	$ 4,248	$ 8,717	$ 8,064
Automation Solutions [Member] | Measurement & Analytical Instrumentation [Member]
Disaggregation of Revenue [Line Items]
Net sales	927	860	1,785	1,632
Automation Solutions [Member] | Valves, Actuators & Regulators [Member]
Disaggregation of Revenue [Line Items]
Net sales	937	921	1,811	1,784
Automation Solutions [Member] | Industrial Solutions [Member]
Disaggregation of Revenue [Line Items]
Net sales	574	484	1,116	912
Automation Solutions [Member] | Process Control Systems & Solutions [Member]
Disaggregation of Revenue [Line Items]
Net sales	572	506	1,097	1,015
Operating Segments [Member] | Automation Solutions [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 3,010	$ 2,771	$ 5,809	$ 5,343