Retirement Benefits Plans (Estimated Future Benefit Payments) (Details) $ in Millions |
Jan. 28, 2017
USD ($)
|
|---|---|
| Pension Plan [Member] | |
| Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract] | |
| 2016 | $ 203 |
| 2017 | 205 |
| 2018 | 210 |
| 2019 | 215 |
| 2020 | 221 |
| 2021-2025 | 1,160 |
| Supplemental Pension Plans [Member] | |
| Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract] | |
| 2016 | 26 |
| 2017 | 18 |
| 2018 | 16 |
| 2019 | 16 |
| 2020 | 13 |
| 2021-2025 | $ 58 |