Other Financial Information (Details) - USD ($) $ in Millions	Dec. 31, 2015	Sep. 30, 2015
Other Financial Information [Line Items]
Finished products	$ 688	$ 680
Raw materials and work in process	1,215	1,167
Total	1,903	1,847
Property, plant and equipment, at cost	8,905	8,931
Less: Accumulated depreciation	5,385	5,346
Total	3,520	3,585
Goodwill, net	6,601	6,653
Goodwill, gross	7,247	7,299
Employee compensation	463	597
Customer advanced payments	478	450
Product warranty	162	167
Pension liabilities	626	662
Deferred income taxes	453	408
Postretirement liabilities, excluding current portion	198	199
Other	533	602
Total	1,810	1,871
Process Management [Member]
Other Financial Information [Line Items]
Goodwill, net	2,775	2,790
Industrial Automation [Member]
Other Financial Information [Line Items]
Goodwill, net	1,017	1,031
Network Power [Member]
Other Financial Information [Line Items]
Goodwill, net	2,126	2,144
Goodwill, accumulated impairment losses	646	646
Climate Technologies [Member]
Other Financial Information [Line Items]
Goodwill, net	490	492
Commercial & Residential Solutions [Member]
Other Financial Information [Line Items]
Goodwill, net	$ 193	$ 196