Income Taxes (Details) (USD $)	3 Months Ended			6 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Jan. 31, 2013	Apr. 30, 2014 item	Apr. 30, 2013	Oct. 31, 2013
Income Taxes
Effective tax rate (as a percent)	22.80%	23.50%		22.50%	22.50%
U.S. federal statutory tax rate (as a percent)				35.00%
Net tax charges related to discrete items	$ (13,000,000)	$ 108,000,000		$ (35,000,000)	$ 103,000,000
Various tax charges related to discrete items	(43,000,000)			(80,000,000)
Tax benefits from restructuring charges	30,000,000			45,000,000
Tax benefits from restructuring and acquisition charges		47,000,000			63,000,000
Tax benefits from adjustments to foreign tax provisions		81,000,000			131,000,000
Tax benefit arising from the retroactive research and development credit			50,000,000
Tax charge recorded related to a past uncertain tax position			(150,000,000)
Number of countries other than the United States where the entity is subject to income tax				80
Unrecognized tax benefits	3,600,000,000			3,600,000,000
Unrecognized tax benefits that would affect effective tax rate if realized	1,800,000,000			1,800,000,000
Accrued income tax payable for interest and penalties	220,000,000			220,000,000
Likelihood of no resolution period				12 months
Likelihood of conclusion period for certain federal, foreign and state tax issues				12 months
Reasonably possible reduction in existing unrecognized tax benefits within the next 12 months	1,300,000,000			1,300,000,000
Current and long-term deferred tax assets and deferred tax liabilities
Current deferred tax assets	2,961,000,000			2,961,000,000		3,893,000,000
Current deferred tax liabilities	(409,000,000)			(409,000,000)		(375,000,000)
Long-term deferred tax assets	1,144,000,000			1,144,000,000		1,346,000,000
Long-term deferred tax liabilities	(1,481,000,000)			(1,481,000,000)		(2,668,000,000)
Net deferred tax position	2,215,000,000			2,215,000,000		2,196,000,000
Recognition of net long term deferred tax assets from intercompany licensing arrangement	$ 1,300,000,000