Fair Value Measurements Fair Value (Details) (USD $) In Millions, unless otherwise specified																																																											3 Months Ended			12 Months Ended
	Oct. 31, 2011	Oct. 31, 2010	Oct. 31, 2011 Fair Value, Measurements, Recurring [Member]	Oct. 31, 2010 Fair Value, Measurements, Recurring [Member]	Oct. 31, 2011 Fair Value, Measurements, Recurring [Member] Foreign Currency Contract [Member]	Oct. 31, 2010 Fair Value, Measurements, Recurring [Member] Foreign Currency Contract [Member]	Oct. 31, 2011 Fair Value, Measurements, Recurring [Member] Commodity Contract [Member]	Oct. 31, 2010 Fair Value, Measurements, Recurring [Member] Commodity Contract [Member]	Oct. 31, 2011 Fair Value, Measurements, Recurring [Member] US Treasury Bill Securities [Member]	Oct. 31, 2010 Fair Value, Measurements, Recurring [Member] US Treasury Bill Securities [Member]	Oct. 31, 2011 Fair Value, Measurements, Recurring [Member] Other US and Non-US Government Bonds [Member]	Oct. 31, 2010 Fair Value, Measurements, Recurring [Member] Other US and Non-US Government Bonds [Member]	Oct. 31, 2011 Fair Value, Measurements, Recurring [Member] Other [Member]	Oct. 31, 2010 Fair Value, Measurements, Recurring [Member] Other [Member]	Oct. 31, 2011 Fair Value, Measurements, Recurring [Member] Level 1 [Member]	Oct. 31, 2010 Fair Value, Measurements, Recurring [Member] Level 1 [Member]	Oct. 31, 2011 Fair Value, Measurements, Recurring [Member] Level 1 [Member] Foreign Currency Contract [Member]	Oct. 31, 2010 Fair Value, Measurements, Recurring [Member] Level 1 [Member] Foreign Currency Contract [Member]	Oct. 31, 2011 Fair Value, Measurements, Recurring [Member] Level 1 [Member] Commodity Contract [Member]	Oct. 31, 2010 Fair Value, Measurements, Recurring [Member] Level 1 [Member] Commodity Contract [Member]	Oct. 31, 2011 Fair Value, Measurements, Recurring [Member] Level 1 [Member] US Treasury Bill Securities [Member]	Oct. 31, 2010 Fair Value, Measurements, Recurring [Member] Level 1 [Member] US Treasury Bill Securities [Member]	Oct. 31, 2011 Fair Value, Measurements, Recurring [Member] Level 1 [Member] Other US and Non-US Government Bonds [Member]	Oct. 31, 2010 Fair Value, Measurements, Recurring [Member] Level 1 [Member] Other US and Non-US Government Bonds [Member]	Oct. 31, 2011 Fair Value, Measurements, Recurring [Member] Level 1 [Member] Other [Member]	Oct. 31, 2010 Fair Value, Measurements, Recurring [Member] Level 1 [Member] Other [Member]	Oct. 31, 2011 Fair Value, Measurements, Recurring [Member] Level 2 [Member]	Oct. 31, 2010 Fair Value, Measurements, Recurring [Member] Level 2 [Member]	Oct. 31, 2011 Fair Value, Measurements, Recurring [Member] Level 2 [Member] Foreign Currency Contract [Member]	Oct. 31, 2010 Fair Value, Measurements, Recurring [Member] Level 2 [Member] Foreign Currency Contract [Member]	Oct. 31, 2011 Fair Value, Measurements, Recurring [Member] Level 2 [Member] Commodity Contract [Member]	Oct. 31, 2010 Fair Value, Measurements, Recurring [Member] Level 2 [Member] Commodity Contract [Member]	Oct. 31, 2011 Fair Value, Measurements, Recurring [Member] Level 2 [Member] US Treasury Bill Securities [Member]	Oct. 31, 2010 Fair Value, Measurements, Recurring [Member] Level 2 [Member] US Treasury Bill Securities [Member]	Oct. 31, 2011 Fair Value, Measurements, Recurring [Member] Level 2 [Member] Other US and Non-US Government Bonds [Member]	Oct. 31, 2010 Fair Value, Measurements, Recurring [Member] Level 2 [Member] Other US and Non-US Government Bonds [Member]	Oct. 31, 2011 Fair Value, Measurements, Recurring [Member] Level 2 [Member] Other [Member]	Oct. 31, 2010 Fair Value, Measurements, Recurring [Member] Level 2 [Member] Other [Member]	Oct. 31, 2011 Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Oct. 31, 2010 Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Oct. 31, 2011 Fair Value, Measurements, Recurring [Member] Level 3 [Member] Foreign Currency Contract [Member]	Oct. 31, 2010 Fair Value, Measurements, Recurring [Member] Level 3 [Member] Foreign Currency Contract [Member]	Oct. 31, 2011 Fair Value, Measurements, Recurring [Member] Level 3 [Member] Commodity Contract [Member]	Oct. 31, 2010 Fair Value, Measurements, Recurring [Member] Level 3 [Member] Commodity Contract [Member]	Oct. 31, 2011 Fair Value, Measurements, Recurring [Member] Level 3 [Member] US Treasury Bill Securities [Member]	Oct. 31, 2010 Fair Value, Measurements, Recurring [Member] Level 3 [Member] US Treasury Bill Securities [Member]	Oct. 31, 2011 Fair Value, Measurements, Recurring [Member] Level 3 [Member] Other US and Non-US Government Bonds [Member]	Oct. 31, 2010 Fair Value, Measurements, Recurring [Member] Level 3 [Member] Other US and Non-US Government Bonds [Member]	Oct. 31, 2011 Fair Value, Measurements, Recurring [Member] Level 3 [Member] Other [Member]	Oct. 31, 2010 Fair Value, Measurements, Recurring [Member] Level 3 [Member] Other [Member]	Oct. 31, 2011 Fair Value, Measurements, Nonrecurring [Member]	Oct. 31, 2010 Fair Value, Measurements, Nonrecurring [Member]	Oct. 31, 2011 Fair Value, Measurements, Nonrecurring [Member] Carrying Value [Member]	Oct. 31, 2010 Fair Value, Measurements, Nonrecurring [Member] Carrying Value [Member]	Oct. 31, 2011 Fair Value, Measurements, Nonrecurring [Member] Level 2 [Member]		Oct. 31, 2010 Fair Value, Measurements, Nonrecurring [Member] Level 2 [Member]		Jul. 31, 2011 Fair Value, Measurements, Nonrecurring [Member] Level 3 [Member]	Oct. 31, 2011 Fair Value, Measurements, Nonrecurring [Member] Level 3 [Member]	Apr. 30, 2011 Fair Value, Measurements, Nonrecurring [Member] Level 3 [Member] Carrying Value [Member]	Oct. 31, 2011 Cash Equivalents [Member] Maximum [Member]	Oct. 31, 2011 Securities Investment [Member] Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Disclosure Cash Equivalents Restricted Cash Equivalents Marketable Securities Maturity Period																																																														90 days	90 days
Assets
Available-for-sale securities									$ 283	$ 159	$ 415	$ 407	$ 20	$ 20							$ 283	$ 159	$ 415	$ 407	$ 20	$ 20							$ 0	$ 0	$ 0	$ 0	$ 0	$ 0							$ 0	$ 0	$ 0	$ 0	$ 0	$ 0
Derivative financial instruments:
Asset derivatives					1	8	3	2									0	0	0	0									0	8	3	0									1	0	0	2
Retained interests				53												0												0												53
Property and equipment																																																											54	54	64
Intangible assets																																																												30	84
Total assets			722	649											718	586											3	8											1	55																				84
Derivative financial instruments:
Liability derivatives					4		6	4									0		0	0									4		3	4									0		3	0
Guarantees			6												0												0												6
Total liabilities			16	4											0	0											7	4											9	0
Finance receivables																																																			5	27	15	50	5	[1]	27	[1]
Specific loss reserves on impaired finance receivables	10	23																																																	10	23
Impairment of Long-Lived Assets Held-for-use																																																											10
Impairment of Intangible Assets (Excluding Goodwill)																																																											$ 54

[1] Certain impaired finance receivables are measured at fair value on a nonrecurring basis. An impairment charge is recorded for the amount by which the carrying value of the receivables exceeds the fair value of the underlying collateral, net of remarketing costs. As of October 31, 2011, impaired receivables with a carrying amount of $15 million had specific loss reserves of $10 million and a fair value of $5 million. As of October 31, 2010, impaired receivables with a carrying amount of $50 million had specific loss reserves of $23 million and a fair value of $27 million. Fair values of the underlying collateral are determined by reference to dealer vehicle value publications adjusted for certain market factors.