Stockholders' Equity (Components of Other Comprehensive Income/ (Loss) (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|
Oct. 29, 2016 |
Oct. 31, 2015 |
[1] | Oct. 29, 2016 |
Oct. 31, 2015 |
[1] | |||
| Stockholders' Equity Note [Abstract] | ||||||||
| Reclassification for amortization of net actuarial (gain)/loss, net of tax | $ (3) | $ 0 | $ (5) | $ 0 | ||||
| Reclassification for amortization of prior service credit/(cost), net of tax | 0 | 0 | 0 | 0 | ||||
| Total, net of tax | $ 2 | $ (10) | $ (1) | $ (19) | ||||
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