Retirement Benefit Plans (Accumulated Other Comprehensive (Loss)/Income) (Details) - USD ($)
$ in Millions |
12 Months Ended |
|
Jan. 28, 2017 |
Jan. 30, 2016 |
| Supplemental Employee Retirement Plan [Member] |
|
|
|
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
|
|
|
| Net loss/(gain) |
$ 12
|
|
$ 13
|
| Prior service cost/(credit) |
(4)
|
|
(4)
|
| Defined Benefit Plan, Accumulated Other Comprehensive Income, before Tax, Total |
8
|
|
9
|
| Pension Plan [Member] |
|
|
|
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
|
|
|
| Net loss/(gain) |
318
|
|
333
|
| Prior service cost/(credit) |
49
|
|
57
|
| Defined Benefit Plan, Accumulated Other Comprehensive Income, before Tax, Total |
367
|
[1] |
$ 390
|
| Defined Benefit Plan, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year |
$ 8
|
|
|
|
|