Stockholders' Equity (Reclassifications Out of Accumulated Other Comprehensive Income/ (Loss) (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Oct. 28, 2017 |
Oct. 29, 2016 |
Oct. 28, 2017 |
Oct. 29, 2016 |
|
| Other Comprehensive Income (Loss), Net of Tax [Abstract] | ||||
| Total, net of tax | $ 43 | $ 2 | $ 70 | $ (1) |