Goodwill, Purchased Technology and Other Intangible Assets (Amortization Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 25, 2020	Oct. 27, 2019	Oct. 28, 2018
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 56	$ 57	$ 199
Cost of products sold
Finite-Lived Intangible Assets [Line Items]
Amortization expense	37	38	180
Research, development, and engineering
Finite-Lived Intangible Assets [Line Items]
Amortization expense	1	1	1
Marketing and selling
Finite-Lived Intangible Assets [Line Items]
Amortization expense	18	18	18
Operating Segments | Semiconductor Systems
Finite-Lived Intangible Assets [Line Items]
Amortization expense	40	43	184
Operating Segments | Applied Global Services
Finite-Lived Intangible Assets [Line Items]
Amortization expense	1	1	1
Operating Segments | Display and Adjacent Markets
Finite-Lived Intangible Assets [Line Items]
Amortization expense	13	13	14
Corporate and Other
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 2	$ 0	$ 0