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Retirement Benefit Plans (Defined Contribution Plans) (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
|
Oct. 29, 2011
|
Oct. 30, 2010
|
Oct. 29, 2011
|
Oct. 30, 2010
|
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| Retirement Benefit Plans | ||||
| Defined contribution plan, total expense | $ 16 | $ 13 | $ 48 | $ 39 |