Share Repurchase Activity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended		9 Months Ended
		Oct. 28, 2017	Oct. 29, 2016	Oct. 28, 2017	Oct. 29, 2016
Disclosure Share Repurchase Activity [Abstract]
Number of shares repurchased	[1]	3.8	0.0	12.5	0.0
Total cost		$ 100	$ 0	$ 300	$ 0
Average per share cost including commissions (in dollars per share)		$ 26.64	$ 0.00	$ 24.21	$ 0.00

[1] Excludes shares withheld to settle employee statutory tax withholding related to the vesting of stock units.