Earnings/(Loss) per Share (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Jan. 31, 2015
Nov. 01, 2014
Aug. 02, 2014
May 03, 2014
Feb. 01, 2014
Nov. 02, 2013
Aug. 03, 2013
May 04, 2013
Jan. 31, 2015
Feb. 01, 2014
Feb. 02, 2013
Earnings Per Share [Abstract]                      
Net income/(loss)                 $ (771) $ (1,388) $ (985)
Weighted average common shares outstanding (basic shares)                 305.2 249.3 219.2
Stock options, restricted stock awards and warrant                 0 0 0
Weighted average shares assuming dilution (diluted shares)                 305.2 249.3 219.2
Basic                 $ (2.53) $ (5.57) $ (4.49)
Diluted $ (0.19) [1] $ (0.62) [1] $ (0.56) [1] $ (1.15) [1] $ 0.11 $ (1.94) $ (2.66) $ (1.58) $ (2.53) $ (5.57) $ (4.49)
Stock options, restricted stock awards and warrant                 26.8 24.3 25.0
[1] EPS is computed independently for each of the quarters presented. The sum of the quarters may not equal the total year amount due to the impact of changes in average quarterly shares outstanding