Earnings/(Loss) per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |
3 Months Ended | 9 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|
Oct. 29, 2016 |
Oct. 31, 2015 |
Oct. 29, 2016 |
Oct. 31, 2015 |
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| Earnings Per Share [Abstract] | ||||||||
| Net income/(loss) | $ (67) | $ (115) | [1] | $ (191) | $ (382) | [1] | ||
| Weighted average common shares outstanding (basic shares) | 308.3 | 306.0 | [1] | 307.8 | 305.8 | [1] | ||
| Weighted average shares assuming dilution (diluted shares) | 308.3 | 306.0 | [1] | 307.8 | 305.8 | [1] | ||
| Basic (in dollars per share) | $ (0.22) | $ (0.38) | [1] | $ (0.62) | $ (1.25) | [1] | ||
| Diluted (in dollars per share) | $ (0.22) | $ (0.38) | [1] | $ (0.62) | $ (1.25) | [1] | ||
| Stock options, restricted stock awards and warrant | 32.9 | 32.0 | 33.7 | 31.8 | ||||
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