Restructuring Charges (Details) (USD $)	3 Months Ended		9 Months Ended			1 Months Ended	3 Months Ended	9 Months Ended		1 Months Ended	3 Months Ended	9 Months Ended	1 Months Ended	3 Months Ended	9 Months Ended	6 Months Ended	9 Months Ended	1 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended		1 Months Ended	9 Months Ended	1 Months Ended	3 Months Ended	9 Months Ended		1 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2013	Jul. 31, 2012	Oct. 31, 2012	May 31, 2012 Fiscal 2012 Restructuring Plan position	Jul. 31, 2013 Fiscal 2012 Restructuring Plan position	Jul. 31, 2013 Fiscal 2012 Restructuring Plan position	May 23, 2012 Fiscal 2012 Restructuring Plan	May 31, 2012 Fiscal 2012 Restructuring Plan Severance and EER	Jul. 31, 2013 Fiscal 2012 Restructuring Plan Severance and EER	Jul. 31, 2013 Fiscal 2012 Restructuring Plan Severance and EER	May 31, 2012 Fiscal 2012 Restructuring Plan Infrastructure and other items	Jul. 31, 2013 Fiscal 2012 Restructuring Plan Infrastructure and other items	Jul. 31, 2013 Fiscal 2012 Restructuring Plan Infrastructure and other items	Apr. 30, 2013 Fiscal 2010 Acquisitions	Jul. 31, 2013 Fiscal 2010 Acquisitions	Jun. 30, 2010 Fiscal 2010 Enterprise Services Business Restructuring Plan	Jul. 31, 2013 Fiscal 2010 Enterprise Services Business Restructuring Plan	Jul. 31, 2013 Fiscal 2010 Enterprise Services Business Restructuring Plan	Jul. 31, 2013 Fiscal 2010 Enterprise Services Business Restructuring Plan Severance and workforce reductions	Jul. 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, 2012 Fiscal 2010 Enterprise Services Business Restructuring Plan Severance and workforce reductions U.S. Defined Benefit Plans position	Jul. 31, 2013 Fiscal 2010 Enterprise Services Business Restructuring Plan Infrastructure	Aug. 31, 2008 Fiscal 2008 HP/EDS Restructuring Plan	Jul. 31, 2013 Fiscal 2008 HP/EDS Restructuring Plan	Jul. 31, 2013 Fiscal 2008 HP/EDS Restructuring Plan	Aug. 26, 2008 Fiscal 2008 HP/EDS Restructuring Plan	Aug. 31, 2008 Fiscal 2008 HP/EDS Restructuring Plan Severance and workforce reductions position	Jul. 31, 2013 Fiscal 2008 HP/EDS Restructuring Plan Severance and workforce reductions	Jul. 31, 2013 Fiscal 2008 HP/EDS Restructuring Plan Infrastructure	Jul. 31, 2013 Fiscal 2008 HP/EDS Restructuring Plan Infrastructure
Restructuring and related costs
Expected cost of the plan						$ 3,600,000,000				$ 3,000,000,000			$ 600,000,000					$ 813,000,000								$ 3,300,000,000
Expected positions to be eliminated						29,000																		8,200						25,000
Variance of expected headcount reductions (as a percent)									15.00%
Charges	81,000,000	1,795,000,000	619,000,000	1,888,000,000			90,000,000	813,000,000			45,000,000	710,000,000		45,000,000	103,000,000	(10,000,000)	(10,000,000)		(8,000,000)	(179,000,000)	(8,000,000)	(179,000,000)					(1,000,000)	(5,000,000)				(1,000,000)	(5,000,000)
Positions eliminated							22,700	22,700															8,200
Costs reflected in purchase price of Electronic Data Systems Corporation ("EDS")																													1,500,000,000
Amount of restructuring charges anticipated																	0			0
Restructuring Reserve
Balance at the beginning of the period			1,027,000,000					608,000,000				597,000,000			11,000,000	10,000,000	10,000,000			228,000,000		227,000,000			1,000,000			181,000,000					181,000,000
Charges	81,000,000	1,795,000,000	619,000,000	1,888,000,000			90,000,000	813,000,000			45,000,000	710,000,000		45,000,000	103,000,000	(10,000,000)	(10,000,000)		(8,000,000)	(179,000,000)	(8,000,000)	(179,000,000)					(1,000,000)	(5,000,000)				(1,000,000)	(5,000,000)
Cash payments			(644,000,000)					(572,000,000)				(500,000,000)			(72,000,000)					(33,000,000)		(33,000,000)						(39,000,000)					(39,000,000)
Other adjustments and non-cash settlements			(15,000,000)					(15,000,000)				(14,000,000)			(1,000,000)					2,000,000		2,000,000						(2,000,000)					(2,000,000)
Balance at the end of the period	987,000,000		987,000,000				834,000,000	834,000,000			793,000,000	793,000,000		41,000,000	41,000,000				18,000,000	18,000,000	17,000,000	17,000,000			1,000,000		135,000,000	135,000,000				135,000,000	135,000,000
Total costs incurred to date			7,071,000,000					2,902,000,000				2,694,000,000			208,000,000		91,000,000			813,000,000		444,000,000			369,000,000			3,265,000,000			2,195,000,000		1,070,000,000
Total expected costs to be incurred			7,772,000,000					3,600,000,000				3,000,000,000			600,000,000		91,000,000			813,000,000		444,000,000			369,000,000			3,268,000,000			2,195,000,000		1,073,000,000
Short-term portion of restructuring reserve, recorded in Accrued restructuring	841,000,000		841,000,000		771,000,000
Long-term portion of restructuring reserve, recorded in Other liabilities	$ 146,000,000		$ 146,000,000		$ 256,000,000