|
Retirement Benefit Plans (Net Periodic Expense) (Details) (USD $)
In Millions, unless otherwise specified
|
3 Months Ended |
|
May 02, 2015
|
May 03, 2014
|
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
|
|
| Net periodic benefit expense/(income) |
$ 10 |
$ 1 |
| Primary Pension Plan |
|
|
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
|
|
| Service cost |
17 |
15 |
| Interest cost |
49 |
53 |
| Expected return on plan assets |
(89) |
(87) |
| Amortization of actuarial loss/(gain) |
26 |
13 |
| Amortization of prior service cost/(credit) |
2 |
1 |
| Net periodic benefit expense/(income) |
5 |
(5) |
| Supplemental Pension Plans |
|
|
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
|
|
| Service cost |
0 |
0 |
| Interest cost |
2 |
2 |
| Amortization of actuarial loss/(gain) |
3 |
4 |
| Amortization of prior service cost/(credit) |
0 |
0 |
| Net periodic benefit expense/(income) |
5 |
6 |
| Primary and Supplemental Pension Plans Total |
|
|
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
|
|
| Service cost |
17 |
15 |
| Interest cost |
51 |
55 |
| Expected return on plan assets |
(89) |
(87) |
| Amortization of actuarial loss/(gain) |
29 |
17 |
| Amortization of prior service cost/(credit) |
2 |
1 |
| Net periodic benefit expense/(income) |
10 |
1 |
| Postretirement Health and Welfare Plan |
|
|
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
|
|
| Service cost |
0 |
0 |
| Interest cost |
0 |
0 |
| Amortization of actuarial loss/(gain) |
0 |
0 |
| Amortization of prior service cost/(credit) |
(2) |
(2) |
| Net periodic benefit expense/(income) |
(2) |
(2) |
| Retirement Benefit Plans Total [Member] |
|
|
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
|
|
| Service cost |
17 |
15 |
| Interest cost |
51 |
55 |
| Expected return on plan assets |
(89) |
(87) |
| Amortization of actuarial loss/(gain) |
29 |
17 |
| Amortization of prior service cost/(credit) |
0 |
(1) |
| Net periodic benefit expense/(income) |
$ 8 |
$ (1) |