Earnings Per Share (Computation Of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Oct. 31, 2020	Nov. 02, 2019	Oct. 31, 2020	Nov. 02, 2019
Earnings Per Share [Abstract]
Net earnings (loss)	$ 53	$ 126	$ (723)	$ 304
Basic shares (in shares)	157.5	155.2	157.0	155.1
Dilutive effect of common stock equivalents (in shares)	0.7	0.6	0.0	0.8
Diluted shares (in shares)	158.2	155.8	157.0	155.9
Earnings (loss) per basic share (in dollars per share)	$ 0.34	$ 0.81	$ (4.60)	$ 1.96
Earnings (loss) per diluted share (in dollars per share)	$ 0.34	$ 0.81	$ (4.60)	$ 1.95
Anti-dilutive common stock equivalents (in shares)	14.4	10.6	14.2	10.5