Earnings Per Share (Computation of Basic and Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	May 04, 2019	May 05, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income/(loss)	$ 172	$ 165
Weighted-average common shares outstanding	112.4	118.7
Dilutive effect of potential common shares	0.7	0.4
Weighted-average common shares outstanding assuming dilution	113.1	119.1
Earnings per share - basic	$ 1.53	$ 1.39
Earnings per share - diluted	$ 1.52	$ 1.38
Stock Option Plans [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive share-based awards excluded from diluted calculation	1.6	2.2