|
Retirement Benefit Plans (Net Periodic Expense) (Details) (USD $)
In Millions, unless otherwise specified
|
3 Months Ended |
|
May 04, 2013
|
Apr. 28, 2012
|
| Net periodic plan expense/(income) |
$ 34 |
$ 58 |
|
Retirement Benefit Plans Total [Member]
|
|
|
| Service cost |
20 |
23 |
| Interest cost |
54 |
65 |
| Expected return on plan assets |
(85) |
(94) |
| Amortization of acruarial loss/(gain) |
44 |
64 |
| Amortization of prior service cost/(credit) |
(1) |
(4) |
| Net periodic plan expense/(income) |
32 |
54 |
|
Primary and Supplemental Pension Plan Total [Member]
|
|
|
| Service cost |
20 |
23 |
| Interest cost |
54 |
65 |
| Expected return on plan assets |
(85) |
(94) |
| Amortization of acruarial loss/(gain) |
44 |
64 |
| Amortization of prior service cost/(credit) |
1 |
|
| Net periodic plan expense/(income) |
34 |
58 |
|
Primary Pension Plan [Member]
|
|
|
| Service cost |
20 |
23 |
| Interest cost |
51 |
62 |
| Expected return on plan assets |
(85) |
(94) |
| Amortization of acruarial loss/(gain) |
38 |
58 |
| Amortization of prior service cost/(credit) |
1 |
|
| Net periodic plan expense/(income) |
25 |
49 |
|
Supplemental Pension Plans [Member]
|
|
|
| Interest cost |
3 |
3 |
| Amortization of acruarial loss/(gain) |
6 |
6 |
| Net periodic plan expense/(income) |
9 |
9 |
|
Postretirement Health and Welfare Plan [Member]
|
|
|
| Amortization of prior service cost/(credit) |
(2) |
(4) |
| Net periodic plan expense/(income) |
$ (2) |
$ (4) |