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Discontinued Operations Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Discontinued operations, net of tax | $ 0 | $ 6 | $ 0 | $ (133)
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
Gain (loss) on sale of business, net of tax |  |  |  | 114
Gain on sale of business, pretax |  |  |  | 486
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
Gain (loss) on sale of business, net of tax |  |  |  | (180)
Loss on sale of business, pretax |  |  |  | 47
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] |  |  |  |
Net earnings (loss) from operations of discontinued operations, net of tax |  |  |  | 6
Income tax expense for repatriation of cash |  |  |  | 103
Benefit from ceasing depreciation on assets from discontinued operations |  |  |  | $ 30

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