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Share-Based Compensation (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Apr. 30, 2011	May 01, 2010
Share-Based Compensation
Total share-based compensation expense	$ 15	$ 14
Share-based compensation, weighted average period of recognition, in years	3.6
Total unrecognized share-based compensation expense for all share-based payment plans	$ 166

Equity-based compensation cost during the period with respect to the award, which will be recognized in income (as well as the total recognized tax benefit) or capitalized as part of the cost of an asset.

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