Goodwill and Other Intangible assets, Net Intangible Assets Not Subject to Amortization (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Indefinite-lived Intangible Assets [Line Items]
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)			$ 0	$ 1	$ 7
Trademarks
Indefinite-lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets (Excluding Goodwill)			$ 21
Brazilian Reporting Unit [Member]
Indefinite-lived Intangible Assets [Line Items]
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	$ 1	$ 3
Indefinite-Lived Intangible Assets (Excluding Goodwill)		$ 24