Postretirement Benefits - Narrative (Details) employees in Thousands, $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended	12 Months Ended
	Feb. 29, 2012	Jul. 31, 2014 USD ($)	Oct. 31, 2013 USD ($)	Jul. 31, 2014 USD ($)	Oct. 31, 2015 USD ($) employees	Oct. 31, 2014 USD ($)	Oct. 31, 2013 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Number Of Former Employees And Their Beneficiaries Included In Retiree Population | employees					35
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease)			$ 33
Defined benefit plan, weighted average rate of increase in in per capita cost percent of benefit obligation					7.80%
Restructuring Charges					$ 76	$ 42	$ 25
Defined Benefit Plan, Accumulated Benefit Obligation					4,000	4,000
Defined Benefit Plan, Curtailments			4
Defined Contribution Plan, Cost Recognized					29	27	27
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year					100
United States Postretirement Benefit Plan of US Entity [Member]
Defined Benefit Plan Disclosure [Line Items]
Deferred Income Taxes and Other Assets, Noncurrent					533
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Contributions by Plan Participants					0	0
Employer contributions					$ 113	$ 164
Discount rate used to calculate benefit obligation					4.00%	3.70%
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax					$ 214	$ 71	(585)
Defined Benefit Plan, Curtailments					0	2
Defined Benefit Plan, Benefits Paid					309	318
Defined Benefit Plan, Fair Value of Plan Assets			2,519		2,422	2,627	2,519
Other Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Contributions by Plan Participants					$ 31	40
Defined benefit plan, weighted average rate of increase in in per capita cost percent of benefit obligation					91.00%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate					5.00%
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year					8.20%
Employer contributions					$ 2	$ 2
Discount rate used to calculate benefit obligation					4.10%	3.70%
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax					$ (42)	$ 314	(200)
Defined Benefit Plan, Curtailments					0	0
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year					2
Defined Benefit Plan, Benefits Paid					183	185
Defined benefit plan, benefits paid from Company assets					61	51
Defined Benefit Plan, Fair Value of Plan Assets			$ 447		369	415	$ 447
Unfunded pension plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefits Paid					$ 15	14
Effect Of Remeasurement On Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax				$ 10
Facility Closing [Member] | Chatham [Member] | Other Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Restructuring charges		$ 14
Discount rate used to calculate benefit obligation		3.80%	4.10%	3.80%			4.10%
Designated as Hedging Instrument [Member] | Put Option [Member]
Defined Benefit Plan Disclosure [Line Items]
Derivative, Term of Contract	3 years
Fixed Income Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations					30.00%
Other Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations					10.00%
Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations					5.00%
US Large Cap [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations					15.00%
US Large Cap [Member] | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets					$ 209	227
US Large Cap [Member] | Other Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets					$ 25	$ 28
Equity Method Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations					55.00%