Income Taxes (Details) (USD $)	3 Months Ended
	Jan. 31, 2014 item	Jan. 31, 2013	Oct. 31, 2013
Income Taxes
Effective tax rate (as a percent)	22.30%	21.70%
U.S. federal statutory tax rate (as a percent)	35.00%
Net tax charges related to discrete items	$ 22,000,000	$ 5,000,000
Various tax charges related to discrete items	37,000,000
Estimated tax benefits associated with restructuring charges, various uncertain tax positions and valuation allowance adjustments		45,000,000
Tax benefits from restructuring charges	15,000,000
Tax charge recorded related to a past uncertain tax position		150,000,000
Tax benefits for various adjustments to estimated tax provisions of foreign jurisdictions		50,000,000
Tax benefit arising from the retroactive research and development credit		50,000,000
Number of countries other than the United States where the entity is subject to income tax	80
Unrecognized tax benefits	3,500,000,000
Unrecognized tax benefits that would affect effective tax rate if realized	1,800,000,000
Accrued income tax payable for interest and penalties	212,000,000
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	1,200,000,000
Current and long-term deferred tax assets and deferred tax liabilities
Current deferred tax assets	3,362,000,000		3,893,000,000
Current deferred tax liabilities	(454,000,000)		(375,000,000)
Long-term deferred tax assets	1,253,000,000		1,346,000,000
Long-term deferred tax liabilities	(2,131,000,000)		(2,668,000,000)
Net deferred tax position	$ 2,030,000,000		$ 2,196,000,000