Segment Information - Schedule of Net Revenue by Geographical Areas (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue	$ 56,639	$ 58,756	$ 58,472
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue	20,227	20,605	20,602
Other countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue	$ 36,412	$ 38,151	$ 37,870