Financing Receivables and Operating Leases (Details) (USD $)	9 Months Ended
	Jul. 31, 2012 Year	Oct. 31, 2011
Financing Receivables and Operating Leases
Financing receivable term, low end of range (in years)	2
Financing receivable term, high end of range (in years)	5
Minimum lease payments receivable	$ 7,774,000,000	$ 7,721,000,000
Unguaranteed residual value	235,000,000	233,000,000
Unearned income	(661,000,000)	(647,000,000)
Financing receivables, gross	7,348,000,000	7,307,000,000
Allowance for doubtful accounts	(145,000,000)	(130,000,000)
Financing receivables, net	7,203,000,000	7,177,000,000
Less current portion	(3,116,000,000)	(3,162,000,000)
Amounts due after one year, net	4,087,000,000	4,015,000,000
Equipment leased to customers under operating leases	3,900,000,000	4,000,000,000
Accumulated depreciation on equipment under lease	$ 1,500,000,000	$ 1,300,000,000