|
Retirement Benefit Plans Retirement Benefit Plans (Accumulated Benefit Obligation) (Details) (USD $)
In Millions, unless otherwise specified |
Jan. 31, 2015
|
Feb. 01, 2014
|
Jan. 27, 2012
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|---|---|---|---|
| Pension Plan [Member] | |||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Accumulated benefit obligation | $ 4,900 | $ 4,200 | |
| Fair value of plan assets | 5,474 | 5,140 | 5,035 |
| Supplemental Employee Retirement Plan [Member] | |||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Accumulated benefit obligation | 166 | 200 | |
| Fair value of plan assets | $ 0 | $ 0 | $ 0 |