Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Jan. 31, 2013	Jan. 31, 2012
Income Taxes [Line Items]
Income Taxes Percent Likelihood Of Being Realized Upon Settlement	50.00%
Liability for uncertain tax positions	$ 86
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	80
Liability for Uncertain Tax Benefits Time Range	12 months
Tax Adjustments, Settlements, and Unusual Provisions	$ 4	$ 12

Reflects the effects of adjustments of previously recorded tax expense, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, IRS tax settlement and unusual repatriation of foreign earnings.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 48

-Paragraph 10A, 10B, 10C

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 48

-Paragraph 10

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration