Discontinued Operations Discontinued Operations - Balance Sheet Disclosures (Details) - USD ($) $ in Millions	Sep. 30, 2016	Sep. 30, 2015
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract]
Receivables, less allowances	$ 1,492
Inventories	578
Property, plant & equipment, net	611
Goodwill	2,691
Other assets	658
Accounts payable	840
Other current liabilities	761
Deferred taxes and other noncurrent liabilities	326
Total liabilities held-for-sale	1,927
Discontinued Operations, Held-for-sale [Member]
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract]
Total assets held-for-sale	6,030	$ 6,222
Network Power Systems Business | Discontinued Operations, Held-for-sale [Member]
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract]
Receivables, less allowances	1,202
Inventories	381
Property, plant & equipment, net	352
Goodwill	2,111
Other assets	581
Total assets held-for-sale	4,627
Accounts payable	664
Other current liabilities	620
Deferred taxes and other noncurrent liabilities	227
Total liabilities held-for-sale	1,511
Power Generation, Motors and Drives Business | Discontinued Operations, Held-for-sale [Member]
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract]
Receivables, less allowances	290
Inventories	197
Property, plant & equipment, net	259
Goodwill	580
Other assets	77
Total assets held-for-sale	1,403
Accounts payable	176
Other current liabilities	141
Deferred taxes and other noncurrent liabilities	99
Total liabilities held-for-sale	$ 416