Cash and Cash Equivalents (Gain (Loss) on Equity Investments) (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 25, 2020	Oct. 27, 2019
Debt and Equity Securities, FV-NI [Line Items]
Total gain (loss) on equity investments, net	$ 9	$ 36
Publicly traded equity securities
Debt and Equity Securities, FV-NI [Line Items]
Unrealized gain	14	28
Unrealized loss	(17)	(5)
Realized gain on sales	1	2
Equity investments in privately-held companies
Debt and Equity Securities, FV-NI [Line Items]
Unrealized gain	18	13
Unrealized loss	(7)	(6)
Realized gain on sales	8	5
Realized loss on sales or impairment	$ (8)	$ (1)