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Segment Information - Revenue and Long-lived Assets by Region (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Jan. 26, 2020	Oct. 27, 2019	Jul. 28, 2019	Apr. 28, 2019	Jan. 27, 2019	Oct. 28, 2018	Jul. 29, 2018	Apr. 29, 2018	Jan. 26, 2020	Jan. 27, 2019	Jan. 28, 2018
Revenues and Long-Lived Assets
Revenue	$ 3,105	$ 3,014	$ 2,579	$ 2,220	$ 2,205	$ 3,181	$ 3,123	$ 3,207	$ 10,918	$ 11,716	$ 9,714
Long-lived assets	1,791				1,512				1,791	1,512
Taiwan
Revenues and Long-Lived Assets
Revenue									3,025	3,360	2,991
Long-lived assets	114				137				114	137
China (including Hong Kong)
Revenues and Long-Lived Assets
Revenue									2,731	2,801	1,896
Long-lived assets	28				38				28	38
Other Asia Pacific
Revenues and Long-Lived Assets
Revenue									2,685	2,368	2,066
Europe
Revenues and Long-Lived Assets
Revenue									992	914	768
Long-lived assets	28				26				28	26
United States
Revenues and Long-Lived Assets
Revenue									886	1,506	1,274
Long-lived assets	1,568				1,266				1,568	1,266
Other countries
Revenues and Long-Lived Assets
Revenue									599	767	$ 719
Long-lived assets	2				1				2	1
India
Revenues and Long-Lived Assets
Long-lived assets	$ 51				$ 44				$ 51	$ 44