|
Retirement Benefit Plans (Details) (USD $)
In Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
|
Jul. 30, 2011
|
Jul. 31, 2010
|
Jul. 30, 2011
|
Jul. 31, 2010
|
|
| Service cost | $ 22 | $ 22 | $ 45 | $ 45 |
| Interest cost | 65 | 65 | 130 | 131 |
| Expected return on plan assets | (97) | (88) | (193) | (176) |
| Net amortization | 38 | 64 | 75 | 127 |
| Net periodic benefit expense / (income) | 28 | 63 | 57 | 127 |
|
Benefits Plan Primary Plan [Member]
|
 |  |  |  |
| Service cost | 22 | 22 | 44 | 44 |
| Interest cost | 62 | 62 | 124 | 124 |
| Expected return on plan assets | (97) | (88) | (193) | (176) |
| Net amortization | 34 | 59 | 68 | 118 |
| Net periodic benefit expense / (income) | 21 | 55 | 43 | 110 |
|
Benefits Supplemental Plan [Member]
|
 |  |  |  |
| Service cost | Â | Â | 1 | 1 |
| Interest cost | 3 | 3 | 6 | 7 |
| Net amortization | 4 | 5 | 7 | 9 |
| Net periodic benefit expense / (income) | 7 | 8 | 14 | 17 |
|
Postretirement Health and Welfare Plan [Member]
|
 |  |  |  |
| Net amortization | (7) | (6) | (13) | (12) |
| Net periodic benefit expense / (income) | $ (7) | $ (6) | $ (13) | $ (12) |