Other Financial Information (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Sep. 30, 2013
Other Financial Information [Line Items]
Finished products	$ 811	$ 678
Raw materials and work in process	1,422	1,217
Total	2,233	1,895
Property, plant and equipment, at cost	9,304	9,092
Less: Accumulated depreciation	5,612	5,487
Total	3,692	3,605
Goodwill	7,875	7,509
Employee compensation	575	650
Customer advanced payments	448	402
Product warranty	190	183
Pension plans	517	539
Deferred income taxes	774	823
Postretirement plans, excluding current portion	261	263
Other	601	688
Total	2,153	2,313
Process Management [Member]
Other Financial Information [Line Items]
Goodwill	2,705	2,383
Industrial Automation [Member]
Other Financial Information [Line Items]
Goodwill	1,363	1,352
Network Power [Member]
Other Financial Information [Line Items]
Goodwill	2,865	2,832
Climate Technologies [Member]
Other Financial Information [Line Items]
Goodwill	505	503
Commercial & Residential Solutions [Member]
Other Financial Information [Line Items]
Goodwill	$ 437	$ 439