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Discontinued Operations - Schedule of Discontinued Operations (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 30, 2016
Apr. 30, 2015
Apr. 30, 2016
Apr. 30, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Income (loss) from discontinued operations, net of tax $ 0 $ 0 $ 0 $ 0