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. 26, 2014		568
Beginning Balances, shareholders' equity at Jan. 26, 2014	$ 4,455	$ 1	$ 3,483	$ (2,538)	$ 5	$ 3,504
Increase (Decrease) in Shareholders' Equity
Other comprehensive income (loss)	3				3
Net income	631					631
Issuance of common stock from stock plans, shares		24
Issuance of common stock from stock plans, value	197		197
Tax withholding related to vesting of restricted stock units, shares		(3)
Tax withholding related to vesting of restricted stock units, value	(43)			(43)
Tax benefit from stock-based compensation	17		17
Share repurchase, shares		(44)
Share repurchase, value	(814)			(814)
Cash dividends declared and paid	(186)					(186)
Stock-based compensation	158		158
Ending common stock, shares, outstanding at Jan. 25, 2015		545
Ending Balances, shareholders' equity at Jan. 25, 2015	$ 4,418	$ 1	3,855	(3,395)	8	3,949
Increase (Decrease) in Shareholders' Equity
Cash dividends declared and paid per common share	$ 0.340
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)
Stock-based compensation	206		206
Reclassification of convertible debt conversion obligation	$ (87)		(87)
Ending common stock, shares, outstanding at Jan. 31, 2016	539	539
Ending Balances, shareholders' equity at Jan. 31, 2016	$ 4,469	$ 1	4,170	(4,048)	(4)	4,350
Increase (Decrease) in Shareholders' Equity
Cash dividends declared and paid per common share	$ 0.395
Other comprehensive income (loss)	$ (12)				(12)
Net income	1,666					1,666
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	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, value			75	75
Cash dividends declared and paid	(261)					(261)
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
Cash dividends declared and paid per common share	$ 0.485
Retained earnings adjustment due to adoption of an accounting standard related to stock-based compensation	$ 353					$ 353
Issuance of common stock in exchange for warrants, shares	44	44
Exercise of convertible note hedges, shares	(23)	(23)