Earnings (Loss) Per Share (Computation Of Earnings (Loss) Per Share) (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
Earnings Per Share [Abstract]
Net earnings (loss)		$ 114	$ (10)	$ 286	$ 153
Basic shares (in shares)		166.6	173.4	166.7	173.3
Dilutive effect of common stock equivalents (in shares)	[1]	2.2	0.0	2.1	2.3
Diluted shares (in shares)		168.8	173.4	168.8	175.6
Earnings (Loss) per basic share (in dollars per share)		$ 0.68	$ (0.06)	$ 1.72	$ 0.88
Earnings (Loss) per diluted share (in dollars per share)		$ 0.67	$ (0.06)	$ 1.70	$ 0.87
Anti-dilutive common stock equivalents (in shares)		10.0	6.5	10.8	9.0

[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.