Earnings/(Loss) per Share (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jul. 28, 2012
Jul. 30, 2011
Jul. 28, 2012
Jul. 30, 2011
Earnings Per Share Abstract        
Net income/(loss) $ (147) $ 14 $ (310) $ 78
Weighted average common shares outstanding (basic shares) 219.3 213.3 218.9 221.3
Stock options and restricted stock awards   3.0   2.9
Weighted average shares assuming dilution (diluted shares) 219.3 216.3 218.9 224.2
Basic $ (0.67) $ 0.07 $ (1.42) $ 0.35
Diluted $ (0.67) $ 0.07 $ (1.42) $ 0.35
Stock options, restricted awards and warrant 26 9 25 8