Restructuring (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2015	Apr. 30, 2014	Oct. 31, 2014
Restructuring Reserve
Balance at the beginning of the period			$ 1,114
Restructuring Charges	255	252	401	366
Cash Payments			(703)
Other Adjustments and Non-Cash Settlements			(60)
Balance at the end of the period	752		752
Short-term portion of restructuring reserve, recorded in Accrued restructuring	614		614		898
Long-term portion of restructuring reserve, recorded in Other liabilities	138		138		216
Total Costs Incurred to Date	9,371		9,371
Total Expected Costs to be Incurred	9,555		9,555
Fiscal 2012 Restructuring Plan
Restructuring Reserve
Balance at the beginning of the period			1,053
Restructuring Charges	258		408
Cash Payments			(694)
Other Adjustments and Non-Cash Settlements			(59)
Balance at the end of the period	708		708
Total Costs Incurred to Date	5,316		5,316
Expected positions to be eliminated	55,000
Positions eliminated	47,600		47,600
Total Expected Costs to be Incurred	5,500		5,500		5,500
Completion Date	Oct. 31, 2021
Fiscal 2012 Restructuring Plan | Severance and EER
Restructuring Reserve
Balance at the beginning of the period			955
Restructuring Charges	238		371
Cash Payments			(622)
Other Adjustments and Non-Cash Settlements			(57)
Balance at the end of the period	647		647
Total Costs Incurred to Date	4,764		4,764
Total Expected Costs to be Incurred	4,935		4,935
Fiscal 2012 Restructuring Plan | Infrastructure and other items
Restructuring Reserve
Balance at the beginning of the period			98
Restructuring Charges	20		37
Cash Payments			(72)
Other Adjustments and Non-Cash Settlements			(2)
Balance at the end of the period	61		61
Total Costs Incurred to Date	552		552
Total Expected Costs to be Incurred	565		565
Other Plans
Restructuring Reserve
Balance at the beginning of the period			61
Restructuring Charges	(3)		(7)
Cash Payments			(9)
Other Adjustments and Non-Cash Settlements			(1)
Balance at the end of the period	44		44
Total Costs Incurred to Date	4,055		4,055
Total Expected Costs to be Incurred	4,055		4,055
Completion Date	Oct. 31, 2019
Other Plans | Severance and workforce reductions
Restructuring Reserve
Balance at the beginning of the period			7
Other Adjustments and Non-Cash Settlements			(1)
Balance at the end of the period	6		6
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			54
Restructuring Charges	(3)		(7)
Cash Payments			(9)
Balance at the end of the period	38		38
Total Costs Incurred to Date	1,426		1,426
Total Expected Costs to be Incurred	$ 1,426		$ 1,426