Stock Based Compensation (Stock Option Activity) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Jan. 28, 2012
Share-based Compensation [Abstract]
Outstanding, beginning of period, shares	38,101,300
Outstanding, beginning of period, weighted average exercise price	$ 25.59
Granted, shares	4,874,900
Granted, weighted average exercise price	$ 23.43
Canceled or forfeited, shares	(1,532,700)
Canceled or forfeited, weighted average exercise price	$ 26.90
Exercised, shares	(7,038,200)
Exercised, weighted average exercise price	$ 20.07
Outstanding, end of period, shares	34,405,300
Outstanding, end of period, weighted average exercise price	$ 26.36
Exercisable, end of period, shares	23,381,300
Exercisable, end of period, weighted average exercise price	$ 29.57
Exercisable, end of period, weighted average remaining contractual life (years)	4.1
Exercisable, end of period, aggregate intrinsic value	$ 99
Options expected to vest, shares	9,701,100
Options expected to vest, weighted average exercise price	$ 19.56
Options expected to vest, weighted average remaining contractual life (years)	8.1
Options expected to vest, aggregate intrinsic value	$ 138