Restructuring Charges (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended			3 Months Ended	6 Months Ended	0 Months Ended	6 Months Ended	0 Months Ended		3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended		3 Months Ended	6 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2014	Apr. 30, 2013	Oct. 31, 2013	Apr. 30, 2014 Fiscal 2012 Restructuring Plan position	Apr. 30, 2014 Fiscal 2012 Restructuring Plan position	May 22, 2014 Fiscal 2012 Restructuring Plan Subsequent event position	Apr. 30, 2014 Fiscal 2012 Restructuring Plan Subsequent event	May 22, 2014 Fiscal 2012 Restructuring Plan Minimum Subsequent event position	May 22, 2014 Fiscal 2012 Restructuring Plan Maximum Subsequent event position	Apr. 30, 2014 Fiscal 2012 Restructuring Plan Severance and EER	Apr. 30, 2014 Fiscal 2012 Restructuring Plan Severance and EER	Apr. 30, 2014 Fiscal 2012 Restructuring Plan Infrastructure and other items	Apr. 30, 2014 Fiscal 2012 Restructuring Plan Infrastructure and other items	Apr. 30, 2014 Other Plans	Apr. 30, 2014 Other Plans	Apr. 30, 2014 Other Plans Severance and workforce reductions	Apr. 30, 2014 Other Plans Infrastructure	Apr. 30, 2014 Other Plans Infrastructure
Restructuring Reserve
Balance at the beginning of the period			$ 1,117				$ 985						$ 945		$ 40		$ 132	$ 10		$ 122
Charges	252	408	366	538		249	364					196	255	53	109	3	2		3	2
Cash Payments			(682)				(656)						(580)		(76)		(26)	(2)		(24)
Other Adjustments and Non-Cash Settlements			10				9						8		1		1			1
Balance at the end of the period	811		811			702	702					628	628	74	74	109	109	8	101	101
Total Costs Incurred to Date			7,717				3,647						3,291		356		4,070	2,629		1,441
Total Expected Costs to Be Incurred			8,072				4,000						3,500		500		4,072	2,629		1,443
Short-term portion of restructuring reserve, recorded in Accrued restructuring	572		572		901
Long-term portion of restructuring reserve, recorded in Other liabilities	239		239		216
Expected positions to be eliminated							34,000	41,000
Positions eliminated						31,400	31,400
Increase in expected positions to be eliminated										11,000	16,000
Expected additional cost in future period								500
Expected cost in future period which impacts cash flow									200
Expected cost in future period which impacts cash flow after fiscal 2014								$ 300