Postretirement Benefits - Schedule of Benefit Plan Assumptions (Details)	12 Months Ended
	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2013
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Discount rate used to determine present value of benefit obligation at end of year	4.00%	3.70%
Expected rate of increase in future compensation levels	3.50%	3.50%
Discount rate(A)	3.70%	4.10%	3.20%
Expected long-term rate of return on plan assets	7.80%	7.80%	8.00%
Expected rate of increase in future compensation levels	3.50%	3.50%	3.50%
Health and Life Insurance Benefits
Defined Benefit Plan Disclosure [Line Items]
Discount rate used to determine present value of benefit obligation at end of year	4.10%	3.70%
Expected rate of increase in future compensation levels	0.00%	0.00%
Discount rate(A)	3.70%	4.10%	3.40%
Expected long-term rate of return on plan assets	7.80%	7.80%	8.00%
Expected rate of increase in future compensation levels	0.00%	0.00%	0.00%