Other Financial Information (Details) - USD ($) $ in Millions	Jun. 30, 2015	Sep. 30, 2014
Other Financial Information [Line Items]
Finished products	$ 810	$ 741
Raw materials and work in process	1,334	1,316
Total	2,144	2,057
Property, plant and equipment, at cost	9,052	9,411
Less: Accumulated depreciation	5,442	5,609
Total	3,610	3,802
Goodwill, net	6,930	7,182
Goodwill, gross	7,576	7,828
Employee compensation	587	705
Customer advanced payments	496	455
Product warranty	172	193
Pension plans	544	564
Deferred income taxes	637	572
Postretirement plans, excluding current portion	215	233
Other	667	628
Total	2,063	1,997
Process Management [Member]
Other Financial Information [Line Items]
Goodwill, net	2,796	2,701
Industrial Automation [Member]
Other Financial Information [Line Items]
Goodwill, net	1,042	1,329
Network Power [Member]
Other Financial Information [Line Items]
Goodwill, net	2,172	2,218
Goodwill, accumulated impairment losses	646	646
Climate Technologies [Member]
Other Financial Information [Line Items]
Goodwill, net	494	500
Commercial & Residential Solutions [Member]
Other Financial Information [Line Items]
Goodwill, net	426	$ 434
Network Power [Member]
Other Financial Information [Line Items]
Goodwill, net	2,172
Power Generation [Member]
Other Financial Information [Line Items]
Goodwill, net	430
Motors and Drives [Member]
Other Financial Information [Line Items]
Goodwill, net	$ 239