Retirement Benefit Plans (Defined Contribution Plans) (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Aug. 01, 2015 |
Aug. 02, 2014 |
Aug. 01, 2015 |
Aug. 02, 2014 |
|
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] | ||||
| Defined contribution plan, total expense | $ 14 | $ 13 | $ 27 | $ 26 |