Restructuring (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			1 Months Ended
	Oct. 31, 2014	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2014 position
Restructuring Reserve
Balance at the beginning of the period	$ 1,117
Charges	1,619	990	2,266
Cash Payments	(1,506)
Other Adjustments and Non-Cash Settlements	(116)
Balance at the end of the period	1,114	1,117		1,114
Short-term portion of restructuring reserve, recorded in Accrued restructuring	898	901		898
Long-term portion of restructuring reserve, recorded in Other liabilities	216	216		216
Total Costs Incurred to Date	8,970			8,970
Total Expected Costs to be Incurred	9,606			9,606
Fiscal 2012 Restructuring Plan
Restructuring Reserve
Balance at the beginning of the period	985
Charges	1,625
Cash Payments	(1,441)
Other Adjustments and Non-Cash Settlements	(116)
Balance at the end of the period	1,053	985		1,053
Expected positions to be eliminated		34,000		55,000
Positions eliminated	40,900			40,900
Total Costs Incurred to Date	4,908			4,908
Total Expected Costs to be Incurred	5,540	4,100		5,540
Completion Date	Oct. 31, 2021
Fiscal 2012 Restructuring Plan | Severance and EER
Restructuring Reserve
Balance at the beginning of the period	945
Charges	1,357
Cash Payments	(1,233)
Other Adjustments and Non-Cash Settlements	(114)
Balance at the end of the period	955			955
Total Costs Incurred to Date	4,393			4,393
Total Expected Costs to be Incurred	5,000			5,000
Fiscal 2012 Restructuring Plan | Infrastructure and other items
Restructuring Reserve
Balance at the beginning of the period	40
Charges	268
Cash Payments	(208)
Other Adjustments and Non-Cash Settlements	(2)
Balance at the end of the period	98			98
Total Costs Incurred to Date	515			515
Total Expected Costs to be Incurred	540			540
Other Plans
Restructuring Reserve
Balance at the beginning of the period	132
Charges	(6)
Cash Payments	(65)
Balance at the end of the period	61			61
Total Costs Incurred to Date	4,062			4,062
Total Expected Costs to be Incurred	4,066			4,066
Completion Date	Oct. 31, 2019
Other Plans | Severance and workforce reductions
Restructuring Reserve
Balance at the beginning of the period	10
Cash Payments	(3)
Balance at the end of the period	7			7
Total Costs Incurred to Date	2,629			2,629
Total Expected Costs to be Incurred	2,629			2,629
Other Plans | Infrastructure
Restructuring Reserve
Balance at the beginning of the period	122
Charges	(6)
Cash Payments	(62)
Balance at the end of the period	54			54
Total Costs Incurred to Date	1,433			1,433
Total Expected Costs to be Incurred	$ 1,437			$ 1,437