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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

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