Segment Information (Details 2) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014
Segment Reporting Information
Net Revenue	$ 25,349	$ 27,585	$ 77,641	$ 83,048
Total segment earnings from operations	1,212	1,458	4,563	5,277
Stock-based compensation expense	(160)	(132)	(476)	(432)
Amortization of intangible assets	(242)	(227)	(685)	(774)
Restructuring charges	(25)	(649)	(426)	(1,015)
Acquisition-related charges	(47)	(2)	(70)	(8)
Separation costs	(401)		(750)
Defined benefit plan settlement charges	(114)		(114)
Impairment of data center assets	136		136
Interest and other, net	(108)	(145)	(421)	(482)
Earnings before taxes	1,104	1,313	4,142	4,795
Operating segments
Segment Reporting Information
Net Revenue	26,292	28,518	80,313	85,691
Total segment earnings from operations	2,465	2,733	7,682	8,143
Elimination of inter-segment net revenue and other
Segment Reporting Information
Net Revenue	943	933	2,672	2,643
Significant Reconciling Items
Segment Reporting Information
Corporate and unallocated costs and eliminations	(128)	(265)	(462)	(637)
Stock-based compensation expense	(160)	(132)	(476)	(432)
Amortization of intangible assets	(242)	(227)	(685)	(774)
Restructuring charges	(25)	(649)	(426)	(1,015)
Acquisition-related charges	(47)	(2)	(70)	(8)
Separation costs	(401)		(750)
Defined benefit plan settlement charges	(114)		(114)
Impairment of data center assets	(136)		(136)
Interest and other, net	$ (108)	$ (145)	$ (421)	$ (482)