Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended
		Apr. 30, 2017	May 01, 2016	Jan. 29, 2017
Numerator:
Net income		$ 507	$ 208
Denominator:
Basic weighted average shares		592	537
Dilutive impact of outstanding securities:
Equity awards		26	20
1% Convertible Senior Notes		14	29
Warrants issued with the 1% Convertible Senior Notes		9	13
Weighted average shares used in diluted per share computation		641	599
Net income per share:
Basic net income per share	[1]	$ 0.86	$ 0.39
Diluted net income per share	[2]	$ 0.79	$ 0.35
Equity awards excluded from diluted net income per share because their effect would have been anti-dilutive		2	3
Number of warrants terminated				63
Warrants Outstanding				75
Total number of shares issued related to terminated Warrants, to date		48
Stated interest rate, Convertible Notes		1.00%
Conversion price - Convertible Notes		$ 20.0562
Warrant Strike Price		26.9988
Average stock price		$ 105.22	$ 32.63

[1] Calculated as net income divided by basic weighted average shares.

[2] Calculated as net income divided by diluted weighted average shares.