Other Financial Information (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012
Other Financial Information [Line Items]
Finished products	$ 848	$ 747
Raw materials and work in process	1,479	1,378
Total Inventories	2,327	2,125
Property, plant and equipment, at cost	9,083	8,934
Less: Accumulated depreciation	5,602	5,425
Total Property, plant and equipment, net	3,481	3,509
Goodwill	8,007	8,026
Employee compensation	553	642
Customer advanced payments	413	380
Product warranty	176	187
Pension plans	716	818
Deferred income taxes	629	592
Postretirement plans, excluding current portion	334	337
Other	668	709
Total Other liabilities	2,347	2,456
Process Management [Member]
Other Financial Information [Line Items]
Goodwill	2,366	2,379
Industrial Automation [Member]
Other Financial Information [Line Items]
Goodwill	1,347	1,338
Network Power [Member]
Other Financial Information [Line Items]
Goodwill	3,354	3,367
Climate Technologies [Member]
Other Financial Information [Line Items]
Goodwill	503	501
Commercial & Residential Solutions [Member]
Other Financial Information [Line Items]
Goodwill	$ 437	$ 441