|
Retirement Benefit Plans (Net Periodic Expense) (Details) (USD $)
In Millions, unless otherwise specified
|
3 Months Ended |
6 Months Ended |
|
Aug. 02, 2014
|
Aug. 03, 2013
|
Aug. 02, 2014
|
Aug. 03, 2013
|
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
|
|
|
|
| Net periodic benefit expense/(income) |
$ 2 |
$ 34 |
$ 3 |
$ 68 |
|
Retirement Benefit Plans Total [Member]
|
|
|
|
|
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
|
|
|
|
| Service cost |
16 |
19 |
31 |
39 |
| Interest cost |
54 |
54 |
109 |
108 |
| Expected return on plan assets |
(87) |
(85) |
(174) |
(170) |
| Amortization of actuarial loss/(gain) |
16 |
44 |
33 |
88 |
| Amortization of prior service cost/(credit) |
1 |
0 |
0 |
(1) |
| Net periodic benefit expense/(income) |
0 |
32 |
(1) |
64 |
|
Primary and Supplemental Pension Plan Total [Member]
|
|
|
|
|
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
|
|
|
|
| Service cost |
16 |
19 |
31 |
39 |
| Interest cost |
54 |
54 |
109 |
108 |
| Expected return on plan assets |
(87) |
(85) |
(174) |
(170) |
| Amortization of actuarial loss/(gain) |
16 |
44 |
33 |
88 |
| Amortization of prior service cost/(credit) |
3 |
2 |
4 |
3 |
| Net periodic benefit expense/(income) |
2 |
34 |
3 |
68 |
|
Primary Pension Plan [Member]
|
|
|
|
|
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
|
|
|
|
| Service cost |
16 |
19 |
31 |
39 |
| Interest cost |
52 |
51 |
105 |
102 |
| Expected return on plan assets |
(87) |
(85) |
(174) |
(170) |
| Amortization of actuarial loss/(gain) |
12 |
38 |
25 |
76 |
| Amortization of prior service cost/(credit) |
3 |
2 |
4 |
3 |
| Net periodic benefit expense/(income) |
(4) |
25 |
(9) |
50 |
|
Supplemental Pension Plans [Member]
|
|
|
|
|
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
|
|
|
|
| Service cost |
0 |
0 |
0 |
0 |
| Interest cost |
2 |
3 |
4 |
6 |
| Amortization of actuarial loss/(gain) |
4 |
6 |
8 |
12 |
| Amortization of prior service cost/(credit) |
0 |
0 |
0 |
0 |
| Net periodic benefit expense/(income) |
6 |
9 |
12 |
18 |
|
Postretirement Health and Welfare Plan [Member]
|
|
|
|
|
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
|
|
|
|
| Service cost |
0 |
0 |
0 |
0 |
| Interest cost |
0 |
0 |
0 |
0 |
| Amortization of actuarial loss/(gain) |
0 |
0 |
0 |
0 |
| Amortization of prior service cost/(credit) |
(2) |
(2) |
(4) |
(4) |
| Net periodic benefit expense/(income) |
$ (2) |
$ (2) |
$ (4) |
$ (4) |