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Stock-Based Compensation (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Apr. 28, 2012 Y	Apr. 30, 2011
Stock-Based Compensation [Abstract]
Stock-based compensation expense	$ 12	$ 15
Unrecognized share-based compensation expense	$ 165
Unrecognized share-based compensation expense, weighted average period recognized, in years	3.7

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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