Taxes on Earning (Details 6) $ in Millions	3 Months Ended	12 Months Ended
	Jan. 31, 2015 USD ($)	Oct. 31, 2015 USD ($) item	Oct. 31, 2014 USD ($)	Oct. 31, 2013 USD ($)
Current and long term deferred tax assets and liabilities
Current deferred tax assets		$ 2,242	$ 2,754
Current deferred tax liabilities		(168)	(284)
Long-term deferred tax assets		871	740
Long-term deferred tax liabilities		(295)	(1,124)
Net deferred tax assets net of deferred tax liabilities		2,650	2,086
Tax benefit (deficiency) from employee stock plans		64	(43)	$ (149)
Recognition of net deferred tax assets from intercompany licensing arrangement	$ 0		1,700
Advance royalty proceeds received from multi-year intercompany licensing arrangements		$ 8,800	$ 11,500
Royalty recognition term	5 years		15 years
Number of independent publicly-traded companies | item		2
Federal
Operating loss carryforwards
Operating loss carryforwards		$ 971
State
Operating loss carryforwards
Operating loss carryforwards		6,100
Foreign
Operating loss carryforwards
Operating loss carryforwards		$ 26,800