Income Taxes (Details) (USD $)	3 Months Ended		9 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2012
Income Taxes [Line Items]
Tax Benefit	$ 173,000,000
Valuation Allowance, Amount	14,000,000		14,000,000
Valuation Allowance, Deferred Tax Asset, Change in Amount	181,000,000
Income Tax Expense (Benefit)		1,500,000,000
Adjustments to Additional Paid in Capital, Other		45,000,000
Income Taxes Percent Likelihood Of Being Realized Upon Settlement	50.00%		50.00%
Liability for uncertain tax positions	14,000,000		14,000,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	6,000,000		6,000,000
Tax Adjustments, Settlements, and Unusual Provisions	2,000,000		9,000,000
Liability for Uncertain Tax Benefits Time Range	12		12
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Lower Bound	0		0
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Upper Bound	$ 25,000,000		$ 25,000,000