Other Financial Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Sep. 30, 2012
Other Financial Information [Line Items]
Finished products	$ 835		$ 835		$ 747
Raw materials and work in process	1,469		1,469		1,378
Total Inventories	2,304		2,304		2,125
Property, plant and equipment, at cost	9,117		9,117		8,934
Less: Accumulated depreciation	5,642		5,642		5,425
Total Property, plant and equipment, net	3,475		3,475		3,509
Goodwill	7,514		7,514		8,026
Employee compensation	622		622		642
Customer advanced payments	429		429		380
Product warranty	181		181		187
Pension plans	645		645		818
Deferred income taxes	591		591		592
Postretirement plans, excluding current portion	333		333		337
Other	671		671		709
Total Other liabilities	2,240		2,240		2,456
Goodwill impairment	503	0	503	0
Percentage by which the estimated fair value of goodwill exceeded the carrying value					10.00%
Process Management [Member]
Other Financial Information [Line Items]
Goodwill	2,370		2,370		2,379
Industrial Automation [Member]
Other Financial Information [Line Items]
Goodwill	1,336		1,336		1,338
Network Power [Member]
Other Financial Information [Line Items]
Goodwill	2,869		2,869		3,367
Climate Technologies [Member]
Other Financial Information [Line Items]
Goodwill	501		501		501
Commercial & Residential Solutions [Member]
Other Financial Information [Line Items]
Goodwill	$ 438		$ 438		$ 441