Discontinued Operations - Financial Results of Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Major components of assets and liabilities included in distribution
(Loss) earnings from discontinued operations, net of taxes	$ (60)	$ 154	$ (149)	$ 1,028
Hewlett-Packard Enterprise | Spinoff
Major components of assets and liabilities included in distribution
Net revenue	0	12,987	0	38,444
Cost of revenue	0	9,281	0	27,609
Expenses	30	3,501	158	9,394
Interest and other, net	(174)	18	(157)	132
Earnings (loss) from discontinued operations before taxes	144	187	(1)	1,309
Provision for taxes	(204)	(33)	(148)	(281)
(Loss) earnings from discontinued operations, net of taxes	(60)	$ 154	(149)	$ 1,028
Tax impact relating to tax indemnification amounts	$ 172		$ 156