Other Financial Information (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Sep. 30, 2011
Other Financial Information [Line Items]
Finished products	$ 849	$ 742
Raw materials and work in process	1,553	1,358
Total Inventories	2,402	2,100
Property, plant and equipment, at cost	8,831	8,731
Less: Accumulated depreciation	5,382	5,294
Total Property, plant and equipment, net	3,449	3,437
Goodwill	8,866	8,771
Employee compensation	555	640
Customer advanced payments	419	385
Product warranty	189	211
Deferred income taxes	735	764
Pension plans	714	736
Postretirement plans, excluding current portion	353	361
Other	734	660
Total Other liabilities	2,536	2,521
Process Management [Member]
Other Financial Information [Line Items]
Goodwill	2,377	2,368
Industrial Automation [Member]
Other Financial Information [Line Items]
Goodwill	1,367	1,393
Network Power [Member]
Other Financial Information [Line Items]
Goodwill	4,059	3,990
Climate Technologies [Member]
Other Financial Information [Line Items]
Goodwill	519	483
Commercial & Residential Solutions [Member]
Other Financial Information [Line Items]
Goodwill	$ 544	$ 537