(Loss) Earnings Per Share (Computation Of (Loss) Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended		9 Months Ended
		Oct. 29, 2016	Oct. 31, 2015	Oct. 29, 2016	Oct. 31, 2015
Earnings Per Share [Abstract]
Net (loss) earnings		$ (10)	$ 81	$ 153	$ 420
Basic shares (in shares)		173.4	187.2	173.3	189.1
Dilutive effect of stock options and other (in shares)	[1]	0.0	4.1	2.3	4.1
Diluted shares (in shares)		173.4	191.3	175.6	193.2
(Loss) Earnings per basic share (in dollars per share)		$ (0.06)	$ 0.43	$ 0.88	$ 2.22
(Loss) Earnings per diluted share (in dollars per share)		$ (0.06)	$ 0.42	$ 0.87	$ 2.17
Anti-dilutive stock options and other (in shares)		6.5	1.9	9.0	1.8

[1] Due to the anti-dilutive effect resulting from the reported net loss for the quarter ended October 29, 2016, the impact of potentially dilutive securities on the weighted-average shares outstanding has been omitted from the quarterly calculation of loss per diluted share. The impact of these potentially dilutive securities has been included in the calculation of weighted-average shares for the nine months ended October 29, 2016.