Income Taxes (Details) (USD $)	3 Months Ended			6 Months Ended
	Apr. 30, 2013	Jan. 31, 2013	Apr. 30, 2012	Apr. 30, 2013	Apr. 30, 2012	Oct. 31, 2012
Income Taxes
Effective tax rate (as a percent)	23.50%		19.50%	22.50%	19.50%
U.S. federal statutory income tax rate (as a percent)				35.00%
Net tax (charge) benefit	$ 108,000,000		$ 25,000,000	$ 103,000,000	$ 74,000,000
Tax benefits from restructuring and acquisition charges	47,000,000		22,000,000	63,000,000	50,000,000
Tax benefits from adjustments to foreign tax provisions	81,000,000			131,000,000
Tax benefits (charges) from miscellaneous discrete items	(20,000,000)			9,000,000
Tax charges related to a past uncertain tax position		150,000,000
Tax benefit arising from the retroactive research and development credit		50,000,000
Unrecognized tax benefits	2,800,000,000			2,800,000,000
Unrecognized tax benefits that would affect effective tax rate if realized	1,500,000,000			1,500,000,000
Accrued income tax payable for interest and penalties	207,000,000			207,000,000
Income tax examination, likelihood of no resolution period				12 months
Income tax examination, likelihood of conclusion period				12 months
Reasonably possible, reduction in existing unrecognized tax benefits within the next 12 months	205,000,000			205,000,000
Classification of current and long-term deferred tax assets and liabilities
Current deferred tax assets	4,107,000,000			4,107,000,000		3,783,000,000
Current deferred tax liabilities	(300,000,000)			(300,000,000)		(230,000,000)
Long-term deferred tax assets	1,567,000,000			1,567,000,000		1,581,000,000
Long-term deferred tax liabilities	(3,790,000,000)			(3,790,000,000)		(2,948,000,000)
Net deferred tax position	$ 1,584,000,000			$ 1,584,000,000		$ 2,186,000,000