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Retirement Benefit Plans (Defined Contribution Plans) (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
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Jan. 28, 2012
|
Jan. 29, 2011
|
Jan. 30, 2010
|
|
| Defined Benefit Plan, Accumulated Other Comprehensive Income, Net Gains (Losses), Before Tax | $ (2,285) | $ (1,568) | |
| Savings Plan - 401(k) | 52 | 41 | 55 |
| Savings Plan - retirement account | 11 | 12 | 8 |
| Mirror Savings Plan | 4 | 3 | 2 |
| Total | 67 | 56 | 65 |
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Benefits Mirror Plan [Member]
|
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| Defined Benefit Plan, Accumulated Other Comprehensive Income, Net Gains (Losses), Before Tax | $ 21 | ||