Financial Instruments and Commodity Contracts - Foreign Currency Contracts (Details) (Foreign Exchange Contract [Member]) In Millions, unless otherwise specified	Apr. 30, 2015 Euro Member Countries, Euro Maturing May 2015 [Member] EUR (€)	Apr. 30, 2015 Euro Member Countries, Euro Maturing June 2015 [Member] EUR (€)	Apr. 30, 2015 Euro Member Countries, Euro Maturing July 2015 [Member] EUR (€)	Apr. 30, 2015 Euro Member Countries, Euro Maturing Aug 2015 - Oct 2015 [Member] EUR (€)		Oct. 31, 2014 Euro Member Countries, Euro Maturing Nov 2014 [Member] EUR (€)	Oct. 31, 2014 Euro Member Countries, Euro Maturing Dec 2014 [Member] EUR (€)	Oct. 31, 2014 Euro Member Countries, Euro Maturing Jan 2015 [Member] EUR (€)	Oct. 31, 2014 Euro Member Countries, Euro Maturing Feb 2015 - Oct 2015 [Member] EUR (€)		Apr. 30, 2015 Canada, Dollars Maturing May 2015 [Member] CAD	Apr. 30, 2015 Canada, Dollars Maturing June 2015 [Member] CAD	Apr. 30, 2015 Canada, Dollars Maturing July 2015 [Member] CAD	Apr. 30, 2015 Canada, Dollars Maturing Aug 2015 - Oct 2015 [Member] CAD
Derivative [Line Items]
Derivative, Notional Amount Expiring Monthly				€ 2					€ 1					25
Derivative, Notional Amount	€ 6	€ 5	€ 5	€ 6	[1]	€ 4	€ 4	€ 5	€ 9	[2]	25	25	25	75	[3]

[1] Forward exchange contracts of €2 million expire on the last day of each month from August 2015 through October 2015.

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

[3] Forward exchange contracts of C$25 million expire on the last day of each month from August 2015 through October 2015.