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Balance Sheet Details (Details) (USD $)
6 Months Ended
Apr. 30, 2011
May 31, 2011
Oct. 31, 2010
Accounts and financing receivables      
Accounts receivable, gross $ 19,054,000,000   $ 19,006,000,000
Allowance for doubtful accounts (433,000,000)   (525,000,000)
Accounts receivable, net 18,621,000,000   18,481,000,000
Financing receivables, gross 3,237,000,000   3,050,000,000
Allowance for doubtful accounts - financing receivables (58,000,000)   (64,000,000)
Financing receivables, net 3,179,000,000   2,986,000,000
Maximum capacity, program for sale of trade receivables 602,000,000   524,000,000
Trade receivables sold 897,000,000    
Available capacity, program for sale of trade receivables 299,000,000   175,000,000
Maximum capacity, program for sale of trade receivables, with a five percent recourse basis   1,100,000,000  
Recourse for additional revolving trade receivables-based facility (as a percent)   5.00%  
Inventory      
Finished goods 4,379,000,000   4,431,000,000
Purchased parts and fabricated assemblies 2,399,000,000   2,035,000,000
Inventory, net $ 6,778,000,000   $ 6,466,000,000