Financial Instruments and Commodity Contracts - Foreign Currency Contracts (Details) (Foreign Exchange Contract [Member]) In Millions, unless otherwise specified	Oct. 31, 2014 USD ($)	Oct. 31, 2014 EUR (€)		Oct. 31, 2013 EUR (€)	Oct. 31, 2014 Contract 1 [Member] USD ($)	Oct. 31, 2014 Contract 1 [Member] CAD	Oct. 31, 2013 Contract 1 [Member] USD ($)	Oct. 31, 2013 Contract 1 [Member] CAD	Oct. 31, 2013 Contract 2 [Member] CAD
Derivative [Line Items]
Derivative, Notional Amount	$ 4	€ 9	[1]	€ 2	$ 4	5	$ 25	90	50

[1] Forward exchange contracts of €1 expire on the last day of each month from February 2015 through October 2015.