Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended		6 Months Ended
		Jul. 30, 2017	Jul. 31, 2016	Jul. 30, 2017	Jul. 31, 2016	Jan. 29, 2017
Numerator:
Net income		$ 583	$ 261	$ 1,091	$ 469
Denominator:
Basic weighted average shares		597	534	595	536
Dilutive impact of outstanding securities:
Equity awards		26	26	26	23
1% Convertible Senior Notes		4	43	9	37
Warrants issued with the 1% Convertible Senior Notes		6	31	7	24
Weighted average shares used in diluted per share computation		633	634	637	620
Net income per share:
Basic net income per share	[1]	$ 0.98	$ 0.49	$ 1.83	$ 0.88
Diluted net income per share	[2]	$ 0.92	$ 0.41	$ 1.71	$ 0.76
Equity awards excluded from diluted net income per share because their effect would have been anti-dilutive		0	0	1	2
Stated interest rate, Convertible Notes		1.00%		1.00%
Conversion price - Convertible Notes		$ 20.0480		$ 20.0480
Warrant Strike Price		26.9876
Average stock price		$ 144.57		$ 124.89
Number of warrants terminated		12		12		63
Total number of shares issued related to terminated Warrants		10		10		48

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

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