Other Financial Information (Details) - USD ($) $ in Millions	Dec. 31, 2016	Sep. 30, 2016
Other Financial Information [Line Items]
Finished products	$ 423	$ 382
Raw materials and work in process	855	826
Total	1,278	1,208
Property, plant and equipment, at cost	7,293	7,327
Less: Accumulated depreciation	4,432	4,396
Total	2,861	2,931
Goodwill, net	3,861	3,909
Employee compensation	323	431
Customer advanced payments	459	433
Product warranty	96	106
Pension liabilities	795	844
Deferred income taxes	213	210
Postretirement liabilities, excluding current portion	191	193
Other	468	482
Total	1,667	1,729
Automation Solutions [Member]
Other Financial Information [Line Items]
Goodwill, net	3,119	3,160
Commercial & Residential Solutions [Member]
Other Financial Information [Line Items]
Goodwill, net	742	749
Tools & Home Products [Member]
Other Financial Information [Line Items]
Goodwill, net	193	196
Climate Technologies [Member]
Other Financial Information [Line Items]
Goodwill, net	$ 549	$ 553