Goodwill, Purchased Technology and Other Intangible Assets (Purchased Technology and Intangible Assets) (Details) - USD ($) $ in Millions	Oct. 25, 2020	Oct. 27, 2019
Summary of Purchased Technology and Intangible Assets [Line Items]
Purchased technology and intangible assets	$ 153	$ 156
Purchased technology, net
Summary of Purchased Technology and Intangible Assets [Line Items]
Purchased technology and intangible assets	75	71
Intangible Assets
Summary of Purchased Technology and Intangible Assets [Line Items]
Purchased technology and intangible assets	$ 78	$ 85