Fair Value Measurements (Level 3 Reconciliation) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Apr. 30, 2012		Apr. 30, 2011		Apr. 30, 2012		Apr. 30, 2011
Guarantees [Member]
Fair Value Assets And Liablities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	$ 7		$ 0		$ 6		$ 0
Total gains (losses) (realized/unrealized) included in earnings	0	[1]	0	[1]	0	[1]	0	[1]
Transfers Into Level 3					0		0
Transfers out of Level 3					0		0
Issuance					1		0
Settlements	0		0		0		0
Balance at end of period	7		0		7		0
Fair Value Change in Unrealized Gains on Assets and Liabilities Still Held	0		0		0		0
Retained Interest [Member]
Fair Value Assets And Liablities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	0		0		0		53
Total gains (losses) (realized/unrealized) included in earnings	0	[1]	0	[1]	0	[1]	1	[1]
Transfers Into Level 3					0		0
Transfers out of Level 3					0		0
Issuance					0		0
Settlements	0		0		0		(54)
Balance at end of period	0		0		0		0
Fair Value Change in Unrealized Gains on Assets and Liabilities Still Held	0		0		0		0
Commodity Contract [Member]
Fair Value Assets And Liablities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	0		5		(2)		2
Total gains (losses) (realized/unrealized) included in earnings	0	[1]	2	[1]	(1)	[1]	6	[1]
Transfers Into Level 3					0		0
Transfers out of Level 3					2		0
Issuance					0		0
Settlements	0		(1)		1		(2)
Balance at end of period	0		6		0		6
Fair Value Change in Unrealized Gains on Assets and Liabilities Still Held	$ 0		$ 0		$ 0		$ 3

[1] For commodity contracts, gains (losses) are included in Costs of products sold. For retained interests, gains recognized are included in Finance revenues.