Industry Segment Operations (Reportable Segment) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Oct. 25, 2020	Jul. 26, 2020	Apr. 26, 2020	Jan. 26, 2020	Oct. 27, 2019	Jul. 28, 2019	Apr. 28, 2019	Jan. 27, 2019	Oct. 25, 2020	Oct. 27, 2019	Oct. 28, 2018
Segment Reporting Information [Line Items]
Net sales	$ 4,688	$ 4,395	$ 3,957	$ 4,162	$ 3,754	$ 3,562	$ 3,539	$ 3,753	$ 17,202	$ 14,608	$ 16,705
Operating Income (Loss)									4,365	3,350	4,491
Deprecation/Amortization									376	363	457
Capital Expenditures									422	441	622
Accounts Receivable	2,963				2,533				2,963	2,533	2,323
Inventories	3,904				3,474				3,904	3,474	3,721
Operating Segments | Semiconductor Systems
Segment Reporting Information [Line Items]
Net sales									11,367	9,027	10,577
Operating Income (Loss)									3,714	2,464	3,441
Deprecation/Amortization									219	202	303
Capital Expenditures									226	168	168
Accounts Receivable	2,061				1,543				2,061	1,543	1,597
Inventories	2,139				1,703				2,139	1,703	2,215
Operating Segments | Applied Global Services
Segment Reporting Information [Line Items]
Net sales									4,155	3,854	3,754
Operating Income (Loss)									1,127	1,101	1,102
Deprecation/Amortization									34	25	21
Capital Expenditures									30	47	33
Accounts Receivable	764				790				764	790	630
Inventories	1,545				1,535				1,545	1,535	1,243
Operating Segments | Display and Adjacent Markets
Segment Reporting Information [Line Items]
Net sales									1,607	1,651	2,298
Operating Income (Loss)									291	294	574
Deprecation/Amortization									31	22	20
Capital Expenditures									29	43	39
Accounts Receivable	179				246				179	246	142
Inventories	195				214				195	214	246
Corporate and Other
Segment Reporting Information [Line Items]
Net sales									73	76	76
Operating Income (Loss)									(767)	(509)	(626)
Deprecation/Amortization									92	114	113
Capital Expenditures									137	183	382
Accounts Receivable	(41)				(46)				(41)	(46)	(46)
Inventories	$ 25				$ 22				$ 25	$ 22	$ 17