Restructuring (Details) item in Thousands, $ in Millions		12 Months Ended
	Sep. 14, 2015 item	Oct. 31, 2016 USD ($)	Oct. 31, 2015 USD ($) position	Oct. 31, 2014 USD ($)
Restructuring Reserve
Restructuring charges		$ 1,236	$ 954	$ 1,471
Short-term portion of restructuring reserve, recorded in Accrued restructuring		671	628	711
Long-term portion of restructuring reserve, recorded in Other liabilities		166	114	178
Allocated restructuring charges
Restructuring Reserve
Restructuring charges				131
Restructuring Plan All
Restructuring Reserve
Balance at the beginning of the period		742	889	878
Restructuring charges		1,236	954	1,340
Cash Payments		(1,043)	(1,021)	(1,239)
Non-cash items		(98)	(80)	(90)
Balance at the end of the period		837	742	889
Total costs incurred to date as of October 31, 2016		9,151
Total expected costs to be incurred as of October 31, 2016		10,259
Fiscal 2015 Plan
Restructuring Reserve
Total expected costs to be incurred as of October 31, 2016		2,600
Expected positions to be eliminated | item	30
Fiscal 2015 Plan | Employee Severance
Restructuring Reserve
Balance at the beginning of the period		351	0	0
Restructuring charges		932	351	0
Cash Payments		(615)	0	0
Non-cash items		(39)	0	0
Balance at the end of the period		629	351	0
Total costs incurred to date as of October 31, 2016		1,283
Total expected costs to be incurred as of October 31, 2016		2,158
Fiscal 2015 Plan | Infrastructure and other
Restructuring Reserve
Balance at the beginning of the period		0	0	0
Restructuring charges		217	1	0
Cash Payments		(132)	(1)	0
Non-cash items		(50)	0	0
Balance at the end of the period		35	0	0
Total costs incurred to date as of October 31, 2016		218
Total expected costs to be incurred as of October 31, 2016		451
Fiscal 2015 Plan | Real estate consolidation
Restructuring Reserve
Total expected costs to be incurred as of October 31, 2016		400
Fiscal 2012 Plan
Restructuring Reserve
Total costs incurred to date as of October 31, 2016		4,500
Fiscal 2012 Plan | Infrastructure and other
Restructuring Reserve
Balance at the beginning of the period		45	91	37
Restructuring charges		1	73	253
Cash Payments		(22)	(116)	(198)
Non-cash items		(1)	(3)	(1)
Balance at the end of the period		23	45	91
Total costs incurred to date as of October 31, 2016		546
Total expected costs to be incurred as of October 31, 2016		546
Fiscal 2012 Plan | Employee Severance and EER
Restructuring Reserve
Balance at the beginning of the period		321	737	712
Restructuring charges		88	542	1,092
Cash Payments		(263)	(884)	(978)
Non-cash items		(7)	(74)	(89)
Balance at the end of the period		139	$ 321	737
Total costs incurred to date as of October 31, 2016		3,980
Total expected costs to be incurred as of October 31, 2016		3,980
Expected positions to be eliminated | position			42,100
Other Plans | Employee Severance
Restructuring Reserve
Balance at the beginning of the period		1	$ 8	9
Restructuring charges		0	(4)	0
Cash Payments		0	0	(1)
Non-cash items		0	(3)	0
Balance at the end of the period		1	1	8
Total costs incurred to date as of October 31, 2016		1,997
Total expected costs to be incurred as of October 31, 2016		1,997
Other Plans | Infrastructure and other
Restructuring Reserve
Balance at the beginning of the period		24	53	120
Restructuring charges		(2)	(9)	(5)
Cash Payments		(11)	(20)	(62)
Non-cash items		(1)	0	0
Balance at the end of the period		10	$ 24	$ 53
Total costs incurred to date as of October 31, 2016		1,127
Total expected costs to be incurred as of October 31, 2016		$ 1,127