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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
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Segment Information Revenue and Long-lived assets by region (Details) - USD ($) $ in Millions	3 Months Ended							6 Months Ended	12 Months Ended
	Jan. 28, 2018	Oct. 29, 2017	Apr. 30, 2017	Jan. 29, 2017	Oct. 30, 2016	Jul. 31, 2016	May 01, 2016	Jul. 30, 2017	Jan. 28, 2018	Jan. 29, 2017	Jan. 31, 2016
Revenues and Long-Lived Assets
Revenue	$ 2,911	$ 2,636	$ 1,937	$ 2,173	$ 2,004	$ 1,428	$ 1,305	$ 2,230	$ 9,714	$ 6,910	$ 5,010
Long-Lived Assets	1,071			583					1,071	583
TAIWAN
Revenues and Long-Lived Assets
Revenue									2,991	2,546	1,912
Long-Lived Assets	58			52					58	52
Other Asia Pacific
Revenues and Long-Lived Assets
Revenue									2,066	1,010	749
Long-Lived Assets	1			1					1	1
CHINA
Revenues and Long-Lived Assets
Revenue									1,896	1,305	806
Long-Lived Assets	33			34					33	34
UNITED STATES
Revenues and Long-Lived Assets
Revenue									1,274	904	643
Long-Lived Assets	928			440					928	440
Europe
Revenues and Long-Lived Assets
Revenue									768	659	482
Long-Lived Assets	11			9					11	9
Other Americas
Revenues and Long-Lived Assets
Revenue									719	486	$ 418
INDIA
Revenues and Long-Lived Assets
Long-Lived Assets	$ 40			$ 47					$ 40	$ 47