Overview and Basis of Presentation (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2018	Jan. 31, 2017
Segment Reporting Information [Line Items]
Net excess tax benefits	$ 14
Net cash provided by (used in) operating activities	142	$ (1,190)
Net cash provided by financing activities	$ (929)	(782)
Accounting Standards Update 2016-09, Statutory Tax Withholding Component
Segment Reporting Information [Line Items]
Net cash provided by (used in) operating activities		(274)
Net cash provided by financing activities		$ 274