Discontinued Operations (Details 2) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net loss from discontinued operations	$ 0	$ (104)	$ (92)
Everett SpinCo, Inc. and Seattle SpinCo, Inc. | Spinoff
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenue		0	8,511
Cost of revenue		0	5,890
Expenses		51	3,063
Interest and other, net		58	39
Loss from discontinued operations before taxes		(109)	(481)
Benefit for taxes		5	389
Net loss from discontinued operations		$ (104)	$ (92)