Restructuring (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			0 Months Ended	12 Months Ended			3 Months Ended	12 Months Ended	1 Months Ended	12 Months Ended	1 Months Ended	12 Months Ended		12 Months Ended	1 Months Ended	12 Months Ended	1 Months Ended	12 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2011	Jul. 31, 2013 Fiscal 2012 Restructuring Plan position	Oct. 31, 2013 Fiscal 2012 Restructuring Plan position	Oct. 31, 2013 Fiscal 2012 Restructuring Plan Severance and EER	Oct. 31, 2013 Fiscal 2012 Restructuring Plan Infrastructure and other items	Apr. 30, 2013 Fiscal 2010 Acquisitions	Oct. 31, 2013 Fiscal 2010 Acquisitions	Jun. 30, 2010 Fiscal 2010 Enterprise Services Business Restructuring Plan	Oct. 31, 2013 Fiscal 2010 Enterprise Services Business Restructuring Plan	Jun. 30, 2010 Fiscal 2010 Enterprise Services Business Restructuring Plan Severance and workforce reductions position	Oct. 31, 2013 Fiscal 2010 Enterprise Services Business Restructuring Plan Severance and workforce reductions	Oct. 31, 2012 Fiscal 2010 Enterprise Services Business Restructuring Plan Severance and workforce reductions position	Oct. 31, 2013 Fiscal 2010 Enterprise Services Business Restructuring Plan Infrastructure	Aug. 31, 2008 Fiscal 2008 HP/EDS Restructuring Plan	Oct. 31, 2013 Fiscal 2008 HP/EDS Restructuring Plan	Aug. 31, 2008 Fiscal 2008 HP/EDS Restructuring Plan Severance and workforce reductions position	Oct. 31, 2013 Fiscal 2008 HP/EDS Restructuring Plan Severance and workforce reductions	Oct. 31, 2013 Fiscal 2008 HP/EDS Restructuring Plan Infrastructure
Restructuring Reserve
Balance at the beginning of the period	$ 1,027				$ 608	$ 597	$ 11		$ 10		$ 228		$ 227		$ 1		$ 181			$ 181
Charges	990	2,266	645		1,194	1,053	141	(10)	(10)		(189)		(189)				(5)			(5)
Cash Payments	(904)				(813)	(701)	(112)				(36)		(36)				(55)			(55)
Other Adjustments and Non-Cash Settlements	4				(4)	(4)					8		8
Balance at the end of the period	1,117	1,027			985	945	40				11		10		1		121			121
Short-term portion of restructuring reserve, recorded in Accrued restructuring	901	771
Long-term portion of restructuring reserve, recorded in Other liabilities	216	256
Expected cost of the plan				3,600	4,100	3,500	600		91	803						3,300
Expected positions to be eliminated				29,000	34,000							8,200						25,000
Variance of expected headcount reductions (as a percent)				15.00%
Charges	990	2,266	645		1,194	1,053	141	(10)	(10)		(189)		(189)				(5)			(5)
Positions eliminated					24,600									8,200
Costs reflected in purchase price of the acquiree											0
Total Costs Incurred to Date	7,442				3,283	3,036	247		91		803		434		369		3,265		2,195	1,070
Total Expected Costs to Be Incurred	$ 8,263				$ 4,100	$ 3,500	$ 600		$ 91		$ 803		$ 434		$ 369		$ 3,269		$ 2,195	$ 1,074