Retirement Benefit Plans Retirement Benefit Plans (Accumulated Benefit Obligation) (Details) - USD ($) $ in Millions |
Feb. 03, 2018 |
Jan. 28, 2017 |
Jan. 30, 2016 |
|---|---|---|---|
| Pension Plan [Member] | |||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Accumulated benefit obligation | $ 3,200 | $ 3,200 | |
| Fair value of plan assets | 3,528 | 3,455 | $ 3,287 |
| Supplemental Employee Retirement Plan [Member] | |||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Accumulated benefit obligation | 167 | 133 | |
| Fair value of plan assets | $ 0 | $ 0 | $ 0 |