Financing Receivables and Operating Leases (Details 2) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Apr. 30, 2012 D	Oct. 31, 2011
Gross financing receivables
Net Investment	$ 7,405	$ 7,307
Allowance for doubtful accounts
Balance at beginning of period	130
Additions to allowance	22
Deductions, net of recoveries	(6)
Balance, end of period	146
Allowance for financing receivables individually evaluated for loss	48	35
Allowance for financing receivables collectively evaluated for loss	98	95
Gross financing receivables individually evaluated for loss	313	228
Gross financing receivables collectively evaluated for loss	7,092	7,079
Period past due, after which account is put on non-accrual status (in days)	90
Period past due, after which a write-off or specific reserve is created (in days)	180
Total financing receivables on non-accrual status	197	157
Total financing receivables greater than 90 days past due and still accruing interest	116	71
Low
Gross financing receivables
Net Investment	4,414	4,261
Moderate
Gross financing receivables
Net Investment	2,913	2,989
High
Gross financing receivables
Net Investment	$ 78	$ 57