Discontinued Operations - Schedule of Discontinued Operations, Financial Results (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net loss from discontinued operations	$ (83)	$ (185)	$ (196)	$ (282)
Everett Transaction | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenue	0	4,205	6,338	12,599
Cost of revenue	0	3,549	5,357	10,861
Expenses	103	804	1,306	1,933
Interest and other, net	0	9	4	23
Loss from discontinued operations before taxes	(103)	(157)	(329)	(218)
Benefit (provision) for taxes	20	(28)	133	(64)
Net loss from discontinued operations	$ (83)	$ (185)	$ (196)	$ (282)