Retirement Benefits (Narrative) (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Oct. 29, 2016 |
Oct. 31, 2015 |
Oct. 29, 2016 |
Oct. 31, 2015 |
|
| Retirement Benefits Disclosure [Line Items] | ||||
| Expense related to the qualified plan | $ 15 | $ 15 | $ 47 | $ 46 |
| Other Pension Plans, Postretirement or Supplemental Plans, Defined Benefit [Member] | ||||
| Retirement Benefits Disclosure [Line Items] | ||||
| Expense related to non-qualified plan | $ 7 | $ 9 | $ 20 | $ 22 |