Earnings/(Loss) per Share (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended
Apr. 28, 2012
Apr. 30, 2011
Earnings Per Share Abstract    
Net income/(loss) $ (163) $ 64
Weighted average common shares outstanding (basic shares) 218.3 229.2
Stock options and restricted stock awards   2.5
Weighted average shares assuming dilution (diluted shares) 218.3 231.7
Basic $ (0.75) $ 0.28
Diluted $ (0.75) $ 0.28
Stock options, restricted awards and warrant 25 8