Retirement Benefit Plans (Net Periodic Expense) (Details) - USD ($)
$ in Millions |
3 Months Ended |
Apr. 29, 2017 |
Apr. 30, 2016 |
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
|
|
| Net periodic benefit expense/(income) |
$ (2)
|
$ 2
|
| Other Postretirement Benefit Plan [Member] |
|
|
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
|
|
| Net periodic benefit expense/(income) |
|
(4)
|
| Primary Pension Plan |
|
|
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
|
|
| Defined benefit plan obligation increase (decrease) due to remeasurement and curtailment |
3
|
|
| Service cost |
11
|
14
|
| Interest cost |
37
|
38
|
| Expected return on plan assets |
(54)
|
(54)
|
| Amortization of prior service cost/(credit) |
2
|
2
|
| Net periodic benefit expense/(income) |
(4)
|
0
|
| Supplemental Pension Plans |
|
|
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
|
|
| Defined benefit plan obligation increase (decrease) due to remeasurement and curtailment |
(3)
|
|
| Service cost |
0
|
0
|
| Interest cost |
2
|
2
|
| Amortization of prior service cost/(credit) |
0
|
0
|
| Net periodic benefit expense/(income) |
2
|
2
|
| Primary and Supplemental Pension Plans Total |
|
|
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
|
|
| Service cost |
11
|
14
|
| Interest cost |
39
|
40
|
| Expected return on plan assets |
(54)
|
(54)
|
| Amortization of prior service cost/(credit) |
2
|
2
|
| Net periodic benefit expense/(income) |
$ (2)
|
$ 2
|