Cash, Cash Equivalents and Investments - Gain (Loss) on Equity Investments (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2021	Jan. 26, 2020
Gain (Loss) on Securities [Line Items]
Total gain (loss) on equity investments, net	$ 8	$ (4)
Publicly traded equity securities
Gain (Loss) on Securities [Line Items]
Unrealized gain	8	2
Unrealized loss	0	(3)
Equity investments in privately-held companies
Gain (Loss) on Securities [Line Items]
Unrealized gain	1	0
Unrealized loss	(3)	(1)
Realized gain on sales	2	0
Realized loss on sales or impairment	$ 0	$ (2)