Postretirement Benefits - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Cost Recognized	$ 7	$ 6	$ 24	$ 21
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year			40
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 11	33	$ 73	98
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