Goodwill, Purchased Technology and Other Intangible Assets (Amortization Expense by Segment) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Apr. 26, 2015	Apr. 27, 2014	Apr. 26, 2015	Apr. 27, 2014
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 46	$ 45	$ 92	$ 91
Silicon Systems Group [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense	44	42	87	84
Applied Global Services [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense	0	2	1	3
Display [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense	1	0	2	1
Energy And Environmental Solutions [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 1	$ 1	$ 2	$ 3