Segment Information - Schedule of Net Revenue by Geographical Areas (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue	$ 58,472	$ 52,056	$ 48,238
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue	20,602	19,321	18,042
Other countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue	$ 37,870	$ 32,735	$ 30,196