| **Postretirement Benefits (Tables)**                  | 6 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
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| **Compensation and Retirement Disclosure [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
| Schedule of Net Benefit Costs [Table Text Block]      |  Three Months Ended April 30, Six Months Ended April 30, Pension Benefits Health and LifeInsurance Benefits Pension Benefits Health and LifeInsurance Benefits(in millions)2015 2014 2015 2014 2015 2014 2015 2014Service cost for benefits earned during the period$3 $2 $2 $1 $6 $6 $3 $2Interest on obligation35 40 18 17 71 79 36 34Amortization of cumulative loss24 23 9 4 49 47 19 8Amortization of prior service benefit— — (1) (1) — — (2) (2)Contractual termination benefits(1) — (1) — (1) — (1) —Premiums on pension insurance4 — — — 5 — — —Expected return on assets(48) (48) (8) (8) (97) (96) (15) (16)Net postretirement benefits expense$17 $17 $19 $13 $33 $36 $40 $26 |

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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=35743120&loc=d3e1928-114920
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