CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Millions, $ in Millions	Total	Common Stock Outstanding	Additional Paid-in Capital	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Retained Earnings
Beginning balance, common stock outstanding (in shares) at Jan. 31, 2016		539
Beginning balances, shareholders' equity at Jan. 31, 2016	$ 4,469	$ 1	$ 4,170	$ (4,048)	$ (4)	$ 4,350
Increase (Decrease) in Shareholders' Equity
Other comprehensive loss	(12)				(12)
Net income	1,666					1,666
Issuance of common stock in exchange for warrants (in shares)		44
Issuance of common stock in exchange for warrants	(1)		(1)
Convertible debt conversion (in shares)		23
Convertible debt conversion	(6)		(6)
Issuance of common stock from stock plans (in shares)		20
Issuance of common stock from stock plans	167		167
Tax withholding related to vesting of restricted stock units (in shares)		(3)
Tax withholding related to vesting of restricted stock units	(177)			(177)
Share repurchase (in shares)		(15)
Share repurchase	(739)			(739)
Exercise of convertible note hedges (in shares)		(23)
Exercise of convertible note hedges	0		75	(75)
Cash dividends declared and paid	(261)					(261)
Stock-based compensation	248		248
Reclassification of convertible debt conversion obligation	55		55
Ending balance, common stock outstanding (in shares) at Jan. 29, 2017		585
Ending balances, shareholders' equity at Jan. 29, 2017	5,762	$ 1	4,708	(5,039)	(16)	6,108
Increase (Decrease) in Shareholders' Equity
Retained earnings adjustment due to adoption of an accounting standard | Income tax consequences of an intra-entity transfer of an asset	(27)					(27)
Other comprehensive loss	(2)				(2)
Net income	3,047					3,047
Issuance of common stock in exchange for warrants (in shares)		13
Issuance of common stock in exchange for warrants	0
Convertible debt conversion (in shares)		33
Convertible debt conversion	(7)		(7)
Issuance of common stock from stock plans (in shares)		18
Issuance of common stock from stock plans	138		138
Tax withholding related to vesting of restricted stock units (in shares)		(4)
Tax withholding related to vesting of restricted stock units	(612)			(612)
Share repurchase (in shares)		(6)
Share repurchase	(909)			(909)
Exercise of convertible note hedges (in shares)		(33)
Exercise of convertible note hedges	0		90	(90)
Cash dividends declared and paid	(341)					(341)
Stock-based compensation	391		391
Reclassification of convertible debt conversion obligation	$ 31		31
Ending balance, common stock outstanding (in shares) at Jan. 28, 2018	606	606
Ending balances, shareholders' equity at Jan. 28, 2018	$ 7,471	$ 1	5,351	(6,650)	(18)	8,787
Increase (Decrease) in Shareholders' Equity
Retained earnings adjustment due to adoption of an accounting standard | New revenue standard	8					8
Other comprehensive loss	6				6
Net income	4,141					4,141
Convertible debt conversion (in shares)		1
Convertible debt conversion	0
Issuance of common stock from stock plans (in shares)		13
Issuance of common stock from stock plans	137		137
Tax withholding related to vesting of restricted stock units (in shares)		(4)
Tax withholding related to vesting of restricted stock units	(1,032)			(1,032)
Share repurchase (in shares)		(9)
Share repurchase	(1,579)			(1,579)
Exercise of convertible note hedges (in shares)		(1)
Exercise of convertible note hedges	0		2	(2)
Cash dividends declared and paid	(371)					(371)
Stock-based compensation	$ 561		561
Ending balance, common stock outstanding (in shares) at Jan. 27, 2019	606	606
Ending balances, shareholders' equity at Jan. 27, 2019	$ 9,342	$ 1	$ 6,051	$ (9,263)	$ (12)	$ 12,565