Stockholders' Equity (Details) - USD ($)
shares in Millions, $ in Millions |
3 Months Ended |
9 Months Ended |
Oct. 31, 2015 |
Nov. 01, 2014 |
Oct. 31, 2015 |
Nov. 01, 2014 |
| Increase (Decrease) in Stockholders' Equity [Roll Forward] |
|
|
|
|
| January 31, 2015, shares |
|
|
304.9
|
|
| January 31, 2015 |
|
|
$ 1,914
|
|
| Net income/(loss) |
$ (137)
|
$ (188)
|
(442)
|
$ (712)
|
| Other comprehensive income/(loss) |
$ 12
|
$ 9
|
41
|
$ 29
|
| Stock-based compensation |
|
|
$ 34
|
|
| October 31, 2015, shares |
305.5
|
304.8
|
305.5
|
304.8
|
| October 31, 2015 |
$ 1,547
|
|
$ 1,547
|
|
| Common Stock [Member] |
|
|
|
|
| Increase (Decrease) in Stockholders' Equity [Roll Forward] |
|
|
|
|
| January 31, 2015, shares |
|
|
304.9
|
|
| January 31, 2015 |
|
|
$ 152
|
|
| Stock-based compensation, shares |
|
|
0.6
|
|
| Stock-based compensation |
|
|
$ 1
|
|
| October 31, 2015, shares |
305.5
|
|
305.5
|
|
| October 31, 2015 |
$ 153
|
|
$ 153
|
|
| Additional Paid-in Capital [Member] |
|
|
|
|
| Increase (Decrease) in Stockholders' Equity [Roll Forward] |
|
|
|
|
| January 31, 2015 |
|
|
4,606
|
|
| Stock-based compensation |
|
|
33
|
|
| October 31, 2015 |
4,639
|
|
4,639
|
|
| Reinvested Earnings/(Accumulated Deficit) [Member] |
|
|
|
|
| Increase (Decrease) in Stockholders' Equity [Roll Forward] |
|
|
|
|
| January 31, 2015 |
|
|
(1,779)
|
|
| Net income/(loss) |
|
|
(442)
|
|
| October 31, 2015 |
(2,221)
|
|
(2,221)
|
|
| Accumulated Other Comprehensive Income/(Loss) [Member] |
|
|
|
|
| Increase (Decrease) in Stockholders' Equity [Roll Forward] |
|
|
|
|
| January 31, 2015 |
|
|
(1,065)
|
|
| Other comprehensive income/(loss) |
|
|
41
|
|
| October 31, 2015 |
$ (1,024)
|
|
$ (1,024)
|
|