Discontinued Operations - Financial Results of Discontinued Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net (loss) earnings from discontinued operations	$ (170)	$ 836	$ 2,089
Hewlett Packard Enterprise | Spinoff
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenue	0	51,892	54,803
Cost of revenue	0	37,072	39,408
Expenses	201	13,269	12,466
Interest and other, net	(208)	351	235
Earnings from discontinued operations before taxes	7	1,200	2,694
Provision for taxes	(177)	(364)	(605)
Net (loss) earnings from discontinued operations	(170)	836	2,089
Changes in tax indemnifications amounts	208	$ (351)	$ (235)
Tax impact on net indemnifications by disposed entity	$ 201