Share-Based Compensation (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 29, 2011 years	Oct. 30, 2010	Oct. 29, 2011 years	Oct. 30, 2010
Share-Based Compensation [Abstract]
Total share-based compensation expense	$ 14	$ 16	$ 43	$ 47
Total unrecognized share-based compensation expense for all share-based payment plans	$ 150		$ 150
Weighted average period	3.3		3.3