Segment Information - Revenue by Geographic Region (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2019	Jan. 31, 2018
Segment Reporting Information [Line Items]
Total net revenue	$ 7,553	$ 7,674
Americas
Segment Reporting Information [Line Items]
Total net revenue	3,005	3,002
Europe, Middle East and Africa
Segment Reporting Information [Line Items]
Total net revenue	2,910	2,837
Asia Pacific and Japan
Segment Reporting Information [Line Items]
Total net revenue	$ 1,638	$ 1,835