Retirement Benefit Plans (Obligations and Funded Status) (Details) - USD ($)
$ in Millions |
12 Months Ended |
|
Jan. 30, 2016 |
Jan. 31, 2015 |
Feb. 01, 2014 |
Dec. 31, 2012 |
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
|
|
|
|
|
|
| Defined Benefit Pension Plan, Liabilities, Noncurrent |
|
$ 40
|
$ 0
|
|
|
|
| Prepaid pension |
|
0
|
220
|
[1] |
|
|
| Change in fair value of plan assets |
|
|
|
|
|
|
| Decrease in funded status of plan |
|
$ (260)
|
|
|
|
|
| Actual return on plan assets (percent) |
|
4.70%
|
|
|
|
|
| Cumulative return on plan assets since inception (percent) |
|
8.80%
|
|
|
|
|
| Pension Plan [Member] |
|
|
|
|
|
|
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
|
|
|
|
|
|
| Defined Benefit Pension Plan, Liabilities, Noncurrent |
|
$ 40
|
|
|
|
|
| Prepaid pension |
|
$ 220
|
|
|
|
|
| Funded status of the plan (percent) |
|
99.00%
|
|
|
|
|
| Change in APBO |
|
|
|
|
|
|
| Beginning balance |
|
$ 5,254
|
4,477
|
|
|
|
| Service cost |
|
69
|
61
|
|
$ 78
|
|
| Interest cost |
|
196
|
211
|
|
204
|
|
| Amendments |
|
0
|
20
|
|
|
|
| Transfer of benefits |
|
0
|
56
|
|
|
|
| Actuarial loss/(gain) |
|
(247)
|
818
|
|
|
|
| Benefits (paid) |
|
(390)
|
(389)
|
|
|
|
| Balance at measurement date |
|
3,327
|
5,254
|
|
4,477
|
|
| Change in fair value of plan assets |
|
|
|
|
|
|
| Beginning Balance |
|
5,474
|
5,140
|
|
|
|
| Company contributions |
|
0
|
0
|
|
|
|
| Actual return on assets |
[2] |
(242)
|
723
|
|
|
|
| Benefits (paid) |
|
(390)
|
(389)
|
|
|
|
| Balance at measurement date |
|
3,287
|
5,474
|
|
5,140
|
|
| Funded status of the plan |
[3] |
(40)
|
220
|
|
|
|
| Defined Benefit Plan, Settlements, Plan Assets |
|
(1,555)
|
0
|
|
|
|
| Supplemental Employee Retirement Plan [Member] |
|
|
|
|
|
|
| Change in APBO |
|
|
|
|
|
|
| Beginning balance |
|
191
|
219
|
|
|
|
| Service cost |
|
0
|
0
|
|
0
|
|
| Interest cost |
|
7
|
9
|
|
12
|
|
| Amendments |
|
0
|
0
|
|
|
|
| Transfer of benefits |
|
0
|
(56)
|
|
|
|
| Actuarial loss/(gain) |
|
(3)
|
39
|
|
|
|
| Benefits (paid) |
|
(19)
|
(20)
|
|
|
|
| Balance at measurement date |
|
176
|
191
|
|
219
|
|
| Change in fair value of plan assets |
|
|
|
|
|
|
| Beginning Balance |
|
0
|
0
|
|
|
|
| Company contributions |
|
19
|
20
|
|
|
|
| Actual return on assets |
|
0
|
0
|
|
|
|
| Benefits (paid) |
|
(19)
|
(20)
|
|
|
|
| Balance at measurement date |
|
0
|
0
|
|
$ 0
|
|
| Funded status of the plan |
[4] |
(176)
|
(191)
|
|
|
|
| Current portion of pension plan liability accrued |
|
46
|
16
|
|
|
|
| Defined Benefit Plan, Settlements, Plan Assets |
|
$ 0
|
$ 0
|
|
|
|
| Exceeded 100% [Member] | Pension Plan [Member] |
|
|
|
|
|
|
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
|
|
|
|
|
|
| Funded status of the plan (percent) |
|
|
|
|
|
100.00%
|
|
|