Share Repurchase Activity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended		6 Months Ended
		Jul. 29, 2017	Jul. 30, 2016	Jul. 29, 2017	Jul. 30, 2016
Disclosure Share Repurchase Activity [Abstract]
Number of shares repurchased	[1]	4.5	0.0	8.7	0.0
Total cost		$ 100	$ 0	$ 200	$ 0
Average per share cost including commissions (in dollars per share)		$ 22.30	$ 0.00	$ 23.15	$ 0.00

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