| **Postretirement Benefits (Tables)**                                                           | 6 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
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| **Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| Schedule of Net Benefit Costs [Table Text Block]                                               | et postretirement benefits expense included in our Consolidated Statements of Operations:  Three Months Ended April 30,  Six Months Ended April 30, PensionBenefits Health andLife InsuranceBenefits PensionBenefits Health andLife InsuranceBenefits(in millions)2013 2012 2013 2012 2013 2012 2013 2012Service cost for benefits earned during the period$5 $4 $2 $2 $10 $8 $4 $4Interest on obligation36 43 16 21 72 86 31 42Amortization of cumulative loss32 27 8 11 64 55 15 20Amortization of prior service benefit— — (1) (1) — — (2) (2)Contractual termination benefits— — — — — — — (3)Premiums on pension insurance1 1 — — 1 1 — —Expected return on assets(47) (48) (9) (9) (94) (96) (17) (18)Net postretirement benefits expense$27 $27 $16 $24 $53 $54 $31 $43 |

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| - Definition
Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920
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