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Net Income Per Share (Earnings Per Share Computation) (Details) (USD $)
In Millions
3 Months Ended
Apr. 30, 2011
May 01, 2010
Net Income Per Share    
Numerator - Net income $ 211 $ 199
Basic 288 307
Impact of dilutive employee stock options 2 [1] 2 [1]
Diluted 290 309
[1] Excludes 9 million weighted-average shares for both the three months ended April 30, 2011 and May 1, 2010 as the impact of such shares was antidilutive.