Schedule II Valuation and Qualifying Accounts (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Oct. 31, 2011	Oct. 31, 2010	Oct. 31, 2009
Allowance for doubtful accounts - accounts receivable:
Valuation and qualifying accounts
Balance, beginning of period	$ 525	$ 629	$ 553
Increase in allowance from acquisitions	27	7
Addition of bad debt provision	23	80	282
Deductions, net of recoveries	(105)	(191)	(206)
Balance, end of period	470	525	629
Allowance for doubtful accounts - financing receivables:
Valuation and qualifying accounts
Balance, beginning of period	140	108	90
Addition of bad debt provision	58	76	63
Deductions, net of recoveries	(68)	(44)	(45)
Balance, end of period	$ 130	$ 140	$ 108