Litigation and Contingencies (Details)	0 Months Ended			0 Months Ended							3 Months Ended	72 Months Ended	1 Months Ended	12 Months Ended		9 Months Ended		0 Months Ended							3 Months Ended
	Dec. 23, 2004	Apr. 30, 2015 USD ($)	Dec. 14, 2010 Fair Labor Standards Act Litigation item	May 10, 2010 India Directorate of Revenue Intelligence Proceedings USD ($)	Apr. 29, 2010 India Directorate of Revenue Intelligence Proceedings USD ($)	Jan. 24, 2013 Bangalore Commissioner of Customs USD ($)	Dec. 11, 2012 Bangalore Commissioner of Customs USD ($)	Apr. 21, 2012 Bangalore Commissioner of Customs USD ($)	Apr. 20, 2012 Bangalore Commissioner of Customs USD ($)	Apr. 11, 2012 Bangalore Commissioner of Customs USD ($)	Apr. 30, 2015 Russia GPO and Other FCPA Investigations USD ($)	Oct. 31, 2006 Russia GPO and Other FCPA Investigations EUR (€)	Jul. 31, 2011 ECT Proceedings	Oct. 31, 2008 ECT Proceedings item	Oct. 31, 2007 ECT Proceedings item	Jul. 31, 2013 ECT Proceedings Minimum	Jul. 31, 2013 ECT Proceedings Maximum	Dec. 06, 2012 Autonomy-Related Legal Matters item	Aug. 16, 2013 Autonomy-Related Legal Matters item	Jul. 30, 2013 Autonomy-Related Legal Matters item	Jul. 26, 2013 Autonomy-Related Legal Matters item	Jan. 22, 2013 Autonomy-Related Legal Matters item	Nov. 30, 2012 Autonomy-Related Legal Matters item	Oct. 31, 2012 Autonomy-Related Legal Matters item	Oct. 31, 2012 Autonomy-Related Legal Matters Software USD ($)	Feb. 28, 2014 Abstrax Proceeding item
Copyright Levies
Levy assessed on a specific vendor on personal computers sold since March 2001 in Germany (euros per unit)	12
Litigation and Contingencies
Copyright levies payable on sales of MFDs in Belgium		$ 0
Number of job codes			20
Aggregate damages sought				370,000,000
Loss contingency deposit to prevent interruption of business					16,000,000
Duties and penalties under show cause notices									17,000,000	386,000,000
Amount deposited under show cause notice prior to order									7,000,000	9,000,000
Additional amount deposited against products-related show cause notice							10,000,000
Additional amount deposited against parts-related show cause notice								3,000,000
Additional amount deposited against product order						24,000,000
Transaction of former subsidiary under investigation												35,000,000
Amount payable to U.S. government agencies											77,000,000
Loss contingency damages paid											31,000,000
ETC Proceedings, period to suspend right to bid and contract													5 years
Number Of Contracts Related To Alleged Improprieties														3	3
Length of sanctions																2 years	5 years
Impairment of goodwill and intangible assets																									$ 8,800,000,000
Number of consolidated putative class action security lawsuits filed																							2
Number of consolidated lawsuits filed																				7
Number of lawsuits alleging insider trading filed																								1
Number of consolidated ERISA lawsuits filed																		3
Additional breach of fiduciary duties lawsuits filed																			2		2
Number of actions other than claims asserted																						3
Number of patents asserted																										1