Earnings/(Loss) per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Oct. 31, 2015 |
Nov. 01, 2014 |
Oct. 31, 2015 |
Nov. 01, 2014 |
|
| Earnings Per Share [Abstract] | ||||
| Net income/(loss) | $ (137) | $ (188) | $ (442) | $ (712) |
| Weighted average common shares outstanding (basic shares) | 306.0 | 305.3 | 305.8 | 305.1 |
| Weighted average shares assuming dilution (diluted shares) | 306.0 | 305.3 | 305.8 | 305.1 |
| Basic (in dollars per share) | $ (0.45) | $ (0.62) | $ (1.45) | $ (2.33) |
| Diluted (in dollars per share) | $ (0.45) | $ (0.62) | $ (1.45) | $ (2.33) |
| Stock options, restricted stock awards and warrant | 32.0 | 26.9 | 31.8 | 26.1 |