Fair Value Measurements (Level 3 Reconciliation) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jan. 31, 2012		Jan. 31, 2011
Guarantees [Member]
Fair Value Assets And Liablities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	$ 6		$ 0
Total gains (losses) (realized/unrealized) included in earnings	0	[1]	0	[1]
Transfers Into Level 3	0		0
Transfers out of Level 3	0		0
Purchases	0		0
Sales	0		0
Issuance	1		0
Settlements	0		0
Balance at end of period	7		0
Change in unrealized gains on assets and liabilities still held	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		53
Total gains (losses) (realized/unrealized) included in earnings	0	[1]	1	[1]
Transfers Into Level 3	0		0
Transfers out of Level 3	0		0
Purchases	0		0
Sales	0		0
Issuance	0		0
Settlements	0		(54)
Balance at end of period	0		0
Change in unrealized gains on assets and liabilities still held	0		0
Commodity Contract [Member] | Derivative Assets And Liabilities [Member]
Fair Value Assets And Liablities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	(2)		2
Total gains (losses) (realized/unrealized) included in earnings	(1)	[1]	4	[1]
Transfers Into Level 3	0		0
Transfers out of Level 3	2		0
Purchases	0		0
Sales	0		0
Issuance	0		0
Settlements	1		(1)
Balance at end of period	0		5
Change in unrealized gains on assets and liabilities still held	$ 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.