Postretirement Benefits - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jul. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Restructuring Charges	$ 3	$ 3
Defined Contribution Plan, Cost Recognized	7	9
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year	80
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	19	$ 30
Effect of change in estimate approach on interest cos	9
Other Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Effect of change in estimate approach on interest cos	$ 4
Facility Closing [Member] | Chatham [Member] | Other Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Restructuring charges			$ 14