Earnings/(Loss) per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |
3 Months Ended | 12 Months Ended | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Jan. 28, 2017 |
[1] | Oct. 29, 2016 |
[1] | Jul. 30, 2016 |
[1] | Apr. 30, 2016 |
[1] | Jan. 30, 2016 |
[1] | Oct. 31, 2015 |
[1] | Aug. 01, 2015 |
[1] | May 02, 2015 |
[1] | Jan. 28, 2017 |
Jan. 30, 2016 |
Jan. 31, 2015 |
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| Earnings Per Share [Abstract] | |||||||||||||||||||||
| Net income/(loss) | $ 1 | $ (513) | $ (717) | ||||||||||||||||||
| Weighted average common shares outstanding (basic shares) | 308.1 | 305.9 | 305.2 | ||||||||||||||||||
| Stock options and restricted stock awards | 4.9 | 0.0 | 0.0 | ||||||||||||||||||
| Weighted average shares assuming dilution (diluted shares) | 313.0 | 305.9 | 305.2 | ||||||||||||||||||
| Basic | $ 0.00 | $ (1.68) | $ (2.35) | ||||||||||||||||||
| Diluted | $ 0.61 | $ (0.22) | $ (0.18) | $ (0.22) | $ (0.43) | $ (0.38) | $ (0.38) | $ (0.49) | $ 0.00 | $ (1.68) | $ (2.35) | ||||||||||
| Stock options, restricted stock awards and a warrant | 17.8 | 34.1 | 26.8 | ||||||||||||||||||
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