Computation of Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Aug. 01, 2015	Aug. 02, 2014	Aug. 01, 2015	Aug. 02, 2014
Numerator:
Net income	$ 36	$ 82	$ 95	$ 178
Denominator:
Weighted-average common shares outstanding	641	641	640	642
Effect of dilutive securities
Employee stock options and restricted shares (including performance-based awards)	6	6	6	6
Weighted-average common shares outstanding assuming dilution	647	647	646	648
Basic Earnings Per Common Share	$ 0.06	$ 0.13	$ 0.15	$ 0.28
Diluted Earnings Per Common Share	$ 0.06	$ 0.13	$ 0.15	$ 0.27
Antidilutive Securities Excluded from Computation of Earnings Per Share	19	28	21	30