Restructuring and Impairments - Schedule of Impairment Charges (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Oct. 31, 2017
Restructuring Cost and Reserve [Line Items]
Liability, Defined Benefit Plan, Noncurrent	$ (2,467)		$ (2,497)
Asset impairment charges	$ 2	$ 2