| **Restructuring (Tables)**                          | 6 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
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| **Restructuring and Related Activities [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| Reconciliation of restructuring liability           | Reconciliation of Restructuring LiabilityThe following table summarizes the activity for the six months ended April 30, 2012 in the restructuring liability, which excludes pension and other postretirement contractual termination benefits: Balance atOctober 31, 2011 Additions Payments Adjustments Balance atApril 30, 2012(in millions)         Employee termination charges$31 $2 $(4) $(3) $26Employee relocation costs— 4 (4) — —Lease vacancy— 19 (1) — 18Other8 1 (7) — 2Restructuring liability$39 $26 $(16) $(3) $46The following table summarizes the activity for the six months ended April 30, 2011, in the restructuring liability, which excludes pension and other postretirement contractual termination benefits charges, and the pension curtailment: Balance atOctober 31, 2010 Additions Payments Adjustments Balance at   April 30, 2011(in millions)         Employee termination charges$5 $17 $(4) $— $18Employee relocation costs— 1 (1) — —Restructuring liability$5 $18 $(5) $— $18 |

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| - Definition
Tabular disclosure of an entity's restructuring reserve that occurred during the period associated with the exit from or disposal of business activities or restructurings for each major type of cost. This element may also include a description of any reversal and other adjustment made during the period to the amount of an accrued liability for restructuring activities. This element may be used to encapsulate the roll forward presentations of an entity's restructuring reserve by type of cost and in total, and explanation of changes that occurred in the period.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 146 -Paragraph 20 -Subparagraph b(2) -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 Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)(2)) -URI http://asc.fasb.org/extlink&oid=6394695&loc=d3e140904-122747
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