Earnings/(Loss) per Share (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Oct. 27, 2012
Oct. 29, 2011
Oct. 27, 2012
Oct. 29, 2011
Earnings Per Share Abstract        
Net income/(loss) $ (123) $ (143) $ (433) $ (65)
Weighted average common shares outstanding (basic shares) 219.4 213.3 219.1 218.6
Weighted average shares assuming dilution (diluted shares) 219.4 213.3 219.1 218.6
Basic $ (0.56) $ (0.67) $ (1.98) $ (0.30)
Diluted $ (0.56) $ (0.67) $ (1.98) $ (0.30)
Stock options, restricted stock awards and warrant 26 19 25 18