Stockholders' Equity (Components of 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 |
| Stockholders' Equity Note [Abstract] |
|
|
|
|
| Reclassification for amortization of net actuarial (gain)/loss, gross amount |
$ 29
|
$ 16
|
$ 87
|
$ 49
|
| Reclassification for amortization of net actuarial (gain)/loss, tax |
(11)
|
(6)
|
(34)
|
(19)
|
| Reclassification for amortization of net actuarial (gain)/loss, net of tax |
18
|
10
|
53
|
30
|
| Reclassification for amortization of prior service (credit)/cost, gross amount |
0
|
(1)
|
0
|
(1)
|
| Reclassification for amortization of prior service (credit)/cost, tax |
0
|
0
|
0
|
0
|
| Reclassification for amortization of prior service credit/(cost), net of tax |
0
|
(1)
|
0
|
(1)
|
| Net gain/(loss) on interest rate swaps, before Tax |
(10)
|
0
|
(19)
|
0
|
| Net gain/(loss) on interest rate swaps, net of tax |
(6)
|
0
|
(12)
|
0
|
| Net gain(loss) on interest rate swaps, tax |
4
|
0
|
7
|
0
|
| Total, gross amount |
19
|
15
|
68
|
48
|
| Total, tax |
(7)
|
(6)
|
(27)
|
(19)
|
| Total, net of tax |
$ 12
|
$ 9
|
$ 41
|
$ 29
|