|
Retirement Benefit Plans (Net Periodic Expense) (Details) (USD $)
In Millions, unless otherwise specified
|
3 Months Ended |
|
May 03, 2014
|
May 04, 2013
|
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
|
|
| Net periodic benefit expense/(income) |
$ 1 |
$ 34 |
|
Retirement Benefit Plans Total [Member]
|
|
|
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
|
|
| Service cost |
15 |
20 |
| Interest cost |
55 |
54 |
| Expected return on plan assets |
(87) |
(85) |
| Amortization of actuarial loss/(gain) |
17 |
44 |
| Amortization of prior service cost/(credit) |
(1) |
(1) |
| Net periodic benefit expense/(income) |
(1) |
32 |
|
Primary and Supplemental Pension Plan Total [Member]
|
|
|
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
|
|
| Service cost |
15 |
20 |
| Interest cost |
55 |
54 |
| Expected return on plan assets |
(87) |
(85) |
| Amortization of actuarial loss/(gain) |
17 |
44 |
| Amortization of prior service cost/(credit) |
1 |
1 |
| Net periodic benefit expense/(income) |
1 |
34 |
|
Primary Pension Plan [Member]
|
|
|
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
|
|
| Service cost |
15 |
20 |
| Interest cost |
53 |
51 |
| Expected return on plan assets |
(87) |
(85) |
| Amortization of actuarial loss/(gain) |
13 |
38 |
| Amortization of prior service cost/(credit) |
1 |
1 |
| Net periodic benefit expense/(income) |
(5) |
25 |
|
Supplemental Pension Plans [Member]
|
|
|
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
|
|
| Service cost |
0 |
0 |
| Interest cost |
2 |
3 |
| Amortization of actuarial loss/(gain) |
4 |
6 |
| Amortization of prior service cost/(credit) |
0 |
0 |
| Net periodic benefit expense/(income) |
6 |
9 |
|
Postretirement Health and Welfare Plan [Member]
|
|
|
| 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) |