Industry Segment Operations (Net Sales and Long-lived Assets) (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
Revenues from External Customers and Long-Lived Assets [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
Long-lived assets	1,777				1,706				1,777	1,706
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales									1,619	1,871	1,413
Long-lived assets	1,628				1,539				1,628	1,539
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales									5,456	4,277	5,047
Long-lived assets	14				20				14	20
Korea
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales									3,031	1,929	3,539
Long-lived assets	21				24				21	24
Taiwan
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales									3,953	2,965	2,504
Long-lived assets	59				56				59	56
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales									1,996	2,198	2,396
Long-lived assets	16				16				16	16
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales									736	820	1,009
Long-lived assets	21				28				21	28
Southeast Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales									411	548	797
Long-lived assets	18				23				18	23
Total outside United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales									15,583	12,737	$ 15,292
Long-lived assets	$ 149				$ 167				$ 149	$ 167