Acquisitions And Divestitures Discontinued Operations (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Earnings (Loss), net of tax	$ 0	$ 0	$ (125)
Diluted earnings from discontinued operations per common share	$ 0	$ 0	$ (0.19)
Discontinued Operations, Disposed of by Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Payments for income taxes and repatriation costs, discontinued operating cash flow			$ 700
Network Power Systems Business [Member] | Discontinued Operations, 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
After tax gain on completion of sale of business			125
Disposal gain (loss), pretax			519
Power Generation, Motors and Drives Business [Member] | Discontinued Operations, 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 gain (loss), pretax			(36)
After tax loss on completion of sale of business			(173)
Combined, Network Power and Power Generation, motors and Drives Business [Member] | Discontinued Operations, Disposed of by Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income tax expense for repatriation of sales proceeds and cash from discontinued operations			109
Benefit from ceasing depreciation on assets from discontinued operations			$ 32