Retirement Benefit Plans Retirement Benefit Plans (Accumulated Benefit Obligation) (Details) - USD ($) $ in Millions |
Jan. 30, 2016 |
Jan. 31, 2015 |
Feb. 01, 2014 |
|---|---|---|---|
| Pension Plan [Member] | |||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Accumulated benefit obligation | $ 3,100 | $ 4,900 | |
| Fair value of plan assets | 3,287 | 5,474 | $ 5,140 |
| Supplemental Employee Retirement Plan [Member] | |||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Accumulated benefit obligation | 153 | 166 | |
| Fair value of plan assets | $ 0 | $ 0 | $ 0 |