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 common stock, shares, outstanding at Jan. 25, 2015		545
Beginning Balances, shareholders' equity at Jan. 25, 2015	$ 4,418	$ 1	$ 3,855	$ (3,395)	$ 8	$ 3,949
Increase (Decrease) in Shareholders' Equity
Other comprehensive income (loss)	(12)				(12)
Net income	614					614
Issuance of common stock from stock plans, shares		22
Issuance of common stock from stock plans, value	186		186
Tax withholding related to vesting of restricted stock units, shares		(3)
Tax withholding related to vesting of restricted stock units, value	(66)			(66)
Tax benefit from stock-based compensation	10		10
Share repurchase, shares		(25)
Share repurchase, value	(587)			(587)
Cash dividends declared and paid	$ (213)					(213)
Cash dividends declared and paid per common share	$ 0.395
Stock-based compensation	$ 206		206
Reclassification of convertible debt conversion obligation	(87)		(87)
Ending common stock, shares, outstanding at Jan. 31, 2016		539
Ending Balances, shareholders' equity at Jan. 31, 2016	4,469	$ 1	4,170	(4,048)	(4)	4,350
Increase (Decrease) in Shareholders' Equity
Retained earnings adjustment due to adoption of an accounting standard related to stock-based compensation	353					353
Other comprehensive income (loss)	(12)				(12)
Net income	1,666					1,666
Issuance of common stock in exchange for warrants, shares		44
Issuance of common stock in exchange for warrants, value	(1)		(1)
Issuance of common stock from stock plans, shares		20
Issuance of common stock from stock plans, value	167		167
Convertible debt conversion, shares		23
Convertible debt conversion, value	(6)		(6)
Tax withholding related to vesting of restricted stock units, shares		(3)
Tax withholding related to vesting of restricted stock units, value	(177)			(177)
Share repurchase, shares		(15)
Share repurchase, value	(739)			(739)
Exercise of convertible note hedges, shares		23
Exercise of convertible note hedges - APIC, value			75
Exercise of convertible note hedges - treasury stock, value				(75)
Cash dividends declared and paid	$ (261)					(261)
Cash dividends declared and paid per common share	$ 0.485
Stock-based compensation	$ 248		248
Reclassification of convertible debt conversion obligation	$ 55		55
Ending common stock, shares, outstanding at Jan. 29, 2017	585	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 related to retained earnings adjustment due to adoption of an accounting standard related to income tax consequences of an intra-entity transfer of an asset	(27)					(27)
Other comprehensive income (loss)	(2)				(2)
Net income	3,047					3,047
Issuance of common stock in exchange for warrants, shares		13
Issuance of common stock from stock plans, shares		18
Issuance of common stock from stock plans, value	$ 138		138
Convertible debt conversion, shares	33	33
Convertible debt conversion, value	$ (7)		(7)
Tax withholding related to vesting of restricted stock units, shares		(4)
Tax withholding related to vesting of restricted stock units, value	(612)			(612)
Share repurchase, shares		(6)
Share repurchase, value	(909)			(909)
Exercise of convertible note hedges, shares		33
Exercise of convertible note hedges - APIC, value			90
Exercise of convertible note hedges - treasury stock, value				(90)
Cash dividends declared and paid	$ (341)					(341)
Cash dividends declared and paid per common share	$ 0.570
Stock-based compensation	$ 391		391
Reclassification of convertible debt conversion obligation	$ 31		31
Ending common stock, shares, outstanding at Jan. 28, 2018	606	606
Ending Balances, shareholders' equity at Jan. 28, 2018	$ 7,471	$ 1	$ 5,351	$ (6,650)	$ (18)	$ 8,787