Postretirement Benefits - Components of Postretirement Benefits Expense Included in Consolidated Statements of Operations (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2011
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Total postretirement benefits expense	$ 177	$ 203	$ 169
Pension Plan, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Total postretirement benefits expense	116	122	139
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Total postretirement benefits expense	$ 61	$ 81	$ 30