Stockholders' Equity (Accumulated Other Comprehensive Income/ (Loss) (Details) - USD ($)
$ in Millions |
3 Months Ended |
9 Months Ended |
Oct. 31, 2015 |
Nov. 01, 2014 |
Oct. 31, 2015 |
Nov. 01, 2014 |
| Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward] |
|
|
|
|
| January 31, 2015 |
|
|
$ (1,065)
|
|
| Amounts reclassified from accumulated other comprehensive income, Net Actuarial Gain/(Loss), net of tax |
$ (18)
|
$ (10)
|
(53)
|
$ (30)
|
| Amounts reclassified from accumulated other comprehensive income, Prior Service Credit/(Cost), net of tax |
0
|
(1)
|
0
|
(1)
|
| Net current-period other comprehensive income |
12
|
9
|
41
|
29
|
| October 31, 2015 |
(1,024)
|
$ (599)
|
(1,024)
|
$ (599)
|
| Net Actuarial Gain/(Loss) [Member] |
|
|
|
|
| Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward] |
|
|
|
|
| January 31, 2015 |
|
|
(1,023)
|
|
| Amounts reclassified from accumulated other comprehensive income, Net Actuarial Gain/(Loss), net of tax |
|
|
(53)
|
|
| October 31, 2015 |
(970)
|
|
(970)
|
|
| Prior Service Credit/(Cost) [Member] |
|
|
|
|
| Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward] |
|
|
|
|
| January 31, 2015 |
|
|
(40)
|
|
| Amounts reclassified from accumulated other comprehensive income, Prior Service Credit/(Cost), net of tax |
|
|
0
|
|
| October 31, 2015 |
(40)
|
|
(40)
|
|
| Accumulated Translation Adjustment [Member] |
|
|
|
|
| Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward] |
|
|
|
|
| January 31, 2015 |
|
|
(2)
|
|
| October 31, 2015 |
(2)
|
|
(2)
|
|
| Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |
|
|
|
|
| Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward] |
|
|
|
|
| January 31, 2015 |
|
|
0
|
|
| Other comprehensive income (loss) before reclassifications, gain (loss) on cash flow hedges, net of tax |
|
|
(14)
|
|
| Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax |
|
|
2
|
|
| October 31, 2015 |
(12)
|
|
(12)
|
|
| Accumulated Other Comprehensive Income/(Loss) [Member] |
|
|
|
|
| Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward] |
|
|
|
|
| January 31, 2015 |
|
|
(1,065)
|
|
| Other comprehensive income (loss) before reclassifications, gain (loss) on cash flow hedges, net of tax |
|
|
(14)
|
|
| Amounts reclassified from accumulated other comprehensive income, Accumulated Other Comprehensive Income/(Loss) |
|
|
55
|
|
| Net current-period other comprehensive income |
|
|
41
|
|
| October 31, 2015 |
$ (1,024)
|
|
$ (1,024)
|
|