Stock-Based Compensation (Summary Of Stock Option Activity) (Details) (Stock Option [Member], USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Jan. 28, 2012	Jan. 29, 2011	Jan. 30, 2010
Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, beginning of year, Shares	14.7
Outstanding, beginning of year, Weighted-average exercise price	$ 27
Granted, Shares	2.7
Granted, Weighted-average exercise price	$ 45	$ 37	$ 13
Exercised, Shares	(3.0)
Exercised, Weighted-average exercise price	$ 21
Cancelled, Shares	(0.3)
Cancelled, Weighted-average exercise price	$ 35
Expired, Shares
Expired, Weighted-average exercise price	$ 9
Outstanding, end of year, Shares	14.1
Outstanding, end of year, Weighted-average exercise price	$ 32
Outstanding, end of year, Weighted-average remaining contractual life (years)	6
Outstanding, end of year, Aggregate intrinsic value	$ 240
Options exercisable at end of year, Shares	7.0
Options exercisable at end of year, Weighted-average exercise price	$ 31
Options exercisable at end of year, Weighted-average remaining contractual life (years)	5
Options exercisable at end of year, Aggregate intrinsic value	129
Options vested or expected to vest at end of year, Shares	13.1
Options vested or expected to vest at end of year, Weighted-average exercise price	$ 32
Options vested or expected to vest at end of year, Weighted-average remaining contractual life (years)	6
Options vested or expected to vest at end of year, Aggregate intrinsic value	$ 226