Income Taxes (Details) (USD $)	3 Months Ended			9 Months Ended
	Jul. 31, 2014	Apr. 30, 2014	Jul. 31, 2013	Jul. 31, 2014 item	Jul. 31, 2013	Oct. 31, 2013
Income Taxes
Effective tax rate (as a percent)	25.00%		18.70%	23.20%	21.10%
U.S. federal statutory tax rate (as a percent)				35.00%
Net tax charges (Benefits) related to discrete items	$ (88,000,000)		$ 63,000,000	$ (53,000,000)	$ (40,000,000)
Tax benefits from restructuring charges	100,000,000		13,000,000	145,000,000	76,000,000
Tax benefit 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	4,000,000,000			4,000,000,000
Unrecognized tax benefits that would affect effective tax rate if realized	1,900,000,000			1,900,000,000
Accrued income tax payable for interest and penalties	228,000,000			228,000,000
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	2,712,000,000			2,712,000,000		3,893,000,000
Current deferred tax liabilities	(418,000,000)			(418,000,000)		(375,000,000)
Long-term deferred tax assets	1,086,000,000			1,086,000,000		1,346,000,000
Long-term deferred tax liabilities	(1,228,000,000)			(1,228,000,000)		(2,668,000,000)
Net deferred tax position	2,152,000,000			2,152,000,000		2,196,000,000
Recognition of net long term deferred tax assets from intercompany licensing arrangement		$ 1,300,000,000