Restructuring and Impairments - Schedule of Impairment Charges (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended					3 Months Ended
	Oct. 31, 2013		Oct. 31, 2014		Oct. 31, 2013	Oct. 31, 2012		Apr. 30, 2014
Restructuring Cost and Reserve [Line Items]
Goodwill, Impairment Loss			$ 142		$ 81
Other Asset Impairment Charges	20		34			16
Asset impairment charges			183		97	16
Brazilian Reporting Unit [Member]
Restructuring Cost and Reserve [Line Items]
Goodwill, Impairment Loss	81	[1]	142	[1]		0	[1]
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	0		7			0		7
Asset impairment charges								149
Discontinued Operations [Member]
Restructuring Cost and Reserve [Line Items]
Asset impairment charges			0		4	28
Impairment charges [Member]
Restructuring Cost and Reserve [Line Items]
Asset impairment charges			$ 183		$ 105	$ 44

[1] (A)For more information, see Note 8, Goodwill and Other Intangible Assets, Net, and includes $4 million related to discontinued operations in 2013.