Postretirement Benefits - Components of Postretirement Benefits Expense (Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2014	Jul. 31, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Increase (Decrease) In Pension and Other Postretirement Benefit Expense			$ 1
Pension Plan, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost for benefits earned during the period	3	5	9	15
Interest on obligation	39	36	118	108
Amortization of cumulative loss	23	31	70	95
Amortization of prior service benefit	0	1	0	1
Contractual termination benefits	14	0	14	0
Premiums on pension insurance	0	0	0	1
Expected return on assets	(48)	(48)	(144)	(142)
Net postretirement benefits expense	31	25	67	78
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost for benefits earned during the period	2	1	4	5
Interest on obligation	17	16	51	47
Amortization of cumulative loss	4	7	12	22
Amortization of prior service benefit	(1)	(1)	(3)	(3)
Contractual termination benefits	0	0	0	0
Premiums on pension insurance	0	0	0	0
Expected return on assets	(8)	(8)	(24)	(25)
Net postretirement benefits expense	14	15	40	46
Facility Closing [Member] | Chatham [Member] | Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Cost of Providing Special or Contractual Termination Benefits Recognized During Period	14
Effect Of Remeasurement On Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax			$ 10