Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Sep. 30, 2016
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Net sales		$ 1,459	$ 1,037	$ 4,201
Cost of sales		961	701	2,774
SG&A		351	263	1,037
Other (income) deductions, net		62	(429)	177
Earnings (Loss) before income taxes		85	502	213
Income taxes		47	635	127
Earnings (Loss), net of tax	$ 6	38	(133)	86
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract]
Receivables					$ 1,492
Inventories					578
Other current assets					130
Property plant & equipment, net					611
Goodwill					2,691
Other noncurrent assets					528
Total assets held-for-sale					6,030
Accounts payable					840
Other current liabilities					761
Deferred taxes and other noncurrent liabilities					326
Total liabilities held-for-sale					1,927
Disposal Group, Including Discontinued Operation, Additional Disclosures [Abstract]
Cash from operating activities			(727)	280
Cash from investing activities			5,022	(55)
Combined, Network Power and Power Generation, motors and Drives Business [Member] | Discontinued Operations, Held-for-sale or Disposed of by Sale [Member]
Disposal Group, Including Discontinued Operation, Additional Disclosures [Abstract]
Benefit from ceasing depreciation on assets from discontinued operations			30
Net earnings (loss) from operations of discontinued operations, net of tax		75	6	201
Income tax expense for repatriation of cash		13		41
Separation costs for professional fees and other costs, net of tax		24		74
Income tax expense for repatriation of sales proceeds and cash from discontinued operations			103
Cash payments for income taxes, professional fees and other costs paid related to discontinued businesses				113
Network Power Systems Business [Member] | Discontinued Operations, Held-for-sale or Disposed of by Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Agreed-Upon Purchase Price of Business			4,000
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Net sales		1,108	630	3,171
Cost of sales		693	394	1,982
SG&A		280	180	829
Other (income) deductions, net		49	(482)	141
Earnings (Loss) before income taxes		86	538	219
Income taxes		45	547	125
Earnings (Loss), net of tax		41	(9)	94
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract]
Receivables					1,202
Inventories					381
Other current assets					108
Property plant & equipment, net					352
Goodwill					2,111
Other noncurrent assets					473
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
Disposal Group, Including Discontinued Operation, Additional Disclosures [Abstract]
Cash from operating activities			(572)	245
Cash from investing activities			3,927	(23)
Gain on sale of business, net of tax			114
Gain on sale of business, pretax			486
Power Generation, Motors and Drives Business [Member] | Discontinued Operations, Held-for-sale or Disposed of by Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Agreed-Upon Purchase Price of Business			1,200
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Net sales		351	407	1,030
Cost of sales		268	307	792
SG&A		71	83	208
Other (income) deductions, net		13	53	36
Earnings (Loss) before income taxes		(1)	(36)	(6)
Income taxes		2	88	2
Earnings (Loss), net of tax		$ (3)	(124)	(8)
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract]
Receivables					290
Inventories					197
Other current assets					22
Property plant & equipment, net					259
Goodwill					580
Other noncurrent assets					55
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
Disposal Group, Including Discontinued Operation, Additional Disclosures [Abstract]
Cash from operating activities			(155)	35
Cash from investing activities			1,095	$ (32)
After tax loss on completion of sale of business			180
Loss on sale of business, pretax			$ 47