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Industry Segment Operations (Reportable Segment) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Oct. 27, 2019	Jul. 28, 2019	Apr. 28, 2019	Jan. 27, 2019	Oct. 28, 2018	Jul. 29, 2018	Apr. 29, 2018	Jan. 28, 2018	Oct. 27, 2019	Oct. 28, 2018	Oct. 29, 2017
Segment Reporting Information [Line Items]
Net Sales	$ 3,754	$ 3,562	$ 3,539	$ 3,753	$ 3,759	$ 4,162	$ 4,579	$ 4,205	$ 14,608	$ 16,705	$ 14,698
Operating Income (Loss)									3,350	4,491	3,936
Deprecation/Amortization									363	457	407
Capital Expenditures									441	622	345
Accounts Receivable	2,533				2,323				2,533	2,323	2,338
Inventories	3,474				3,721				3,474	3,721	2,707
Operating Segments \| Semiconductor Systems
Segment Reporting Information [Line Items]
Net Sales									9,027	10,577	9,544
Operating Income (Loss)									2,464	3,441	3,177
Deprecation/Amortization									202	303	286
Capital Expenditures									168	168	150
Accounts Receivable	1,543				1,597				1,543	1,597	1,626
Inventories	1,703				2,215				1,703	2,215	1,638
Operating Segments \| Applied Global Services
Segment Reporting Information [Line Items]
Net Sales									3,854	3,754	3,014
Operating Income (Loss)									1,101	1,102	817
Deprecation/Amortization									25	21	15
Capital Expenditures									47	33	21
Accounts Receivable	790				630				790	630	564
Inventories	1,535				1,243				1,535	1,243	762
Operating Segments \| Display and Adjacent Markets
Segment Reporting Information [Line Items]
Net Sales									1,651	2,298	2,042
Operating Income (Loss)									294	574	585
Deprecation/Amortization									22	20	12
Capital Expenditures									43	39	17
Accounts Receivable	246				142				246	142	190
Inventories	214				246				214	246	279
Corporate and Other
Segment Reporting Information [Line Items]
Net Sales									76	76	98
Operating Income (Loss)									(509)	(626)	(643)
Deprecation/Amortization									114	113	94
Capital Expenditures									183	382	157
Accounts Receivable	(46)				(46)				(46)	(46)	(42)
Inventories	$ 22				$ 17				$ 22	$ 17	$ 28