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Retirement Benefit Plans (Defined Contribution Plans) (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
|
Aug. 02, 2014
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Aug. 03, 2013
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Aug. 02, 2014
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Aug. 03, 2013
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| Retirement Benefit Plans [Abstract] | ||||
| Defined contribution plan, total expense | $ 13 | $ 12 | $ 26 | $ 26 |