Share-Based Compensation (Total Share-Based Compensation Expense) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 29, 2011	Oct. 30, 2010	Oct. 29, 2011	Oct. 30, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 16	$ 16	$ 50	$ 61
Less: Income tax benefit	(7)	(6)	(20)	(24)
Share-based compensation expense, net of tax	9	10	30	37
Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options	11	12	35	48
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options	4	3	12	10
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options	$ 1	$ 1	$ 3	$ 3