Cash, Cash Equivalents and Investments - Gain (Loss) on Equity Investments (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 26, 2020	Jan. 27, 2019
Gain (Loss) on Securities [Line Items]
Total gain on equity investments, net	$ (4)	$ 12
Publicly traded equity securities
Gain (Loss) on Securities [Line Items]
Unrealized gain	2	6
Unrealized loss	(3)	(2)
Gain on sales	0	1
Equity investments in privately-held companies
Gain (Loss) on Securities [Line Items]
Unrealized gain	0	7
Unrealized loss	(1)	(1)
Gain on sales	0	1
Loss on sales or impairment	$ (2)	$ 0