Stock-Based Compensation (Summary Of Restricted Stock Unit Activity) (Details) - Restricted stock units [Member] shares in Millions	12 Months Ended
	Jan. 28, 2017 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, beginning of year (in shares or units) | shares	0.9
Outstanding, beginning of year (in dollars per share) | $ / shares	$ 66
Granted (in shares or units) | shares	1.9
Granted (in dollars per share) | $ / shares	$ 44
Vested (in shares or units) | shares	(0.3)
Vested (in dollars per share) | $ / shares	$ 65
Forfeited or cancelled (in shares or units) | shares	(0.2)
Forfeited or cancelled (in dollars per share) | $ / shares	$ 55
Outstanding, end of year (in shares or units) | shares	2.3
Outstanding, end of year (in dollars per share) | $ / shares	$ 49