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Benefit Plans (Tables) | 6 Months Ended
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Aug. 01, 2015
Pension and Other Postretirement Benefit Expense [Abstract] |
Schedule of Costs of Retirement Plans | The defined contribution plan expense and actuarially determined components of the net periodic benefit cost (income) associated with the defined benefit plans are as follows:
| 13 Weeks Ended |  | 26 Weeks Ended
| August 1, 2015 |  | August 2, 2014 |  | August 1, 2015 |  | August 2, 2014
| (millions)
401(k) Defined Contribution Plan | $ | 24 |  |  | $ | 25 |  |  | $ | 47 |  |  | $ | 50 |
Pension Plan |  |  |  |  |  |  |
Service cost | $ | 1 |  |  | $ | 1 |  |  | $ | 3 |  |  | $ | 3 |
Interest cost | 34 |  |  | 37 |  |  | 68 |  |  | 75 |
Expected return on assets | (58 | ) |  | (62 | ) |  | (117 | ) |  | (123 | )
Recognition of net actuarial loss | 9 |  |  | 7 |  |  | 19 |  |  | 13 |
Amortization of prior service credit | — |  |  | — |  |  | — |  |  | — |
| $ | (14 | ) |  | $ | (17 | ) |  | $ | (27 | ) |  | $ | (32 | )
Supplementary Retirement Plan |  |  |  |  |  |  |
Service cost | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost | 8 |  |  | 9 |  |  | 16 |  |  | 17 |
Recognition of net actuarial loss | 2 |  |  | 1 |  |  | 5 |  |  | 2 |
Amortization of prior service cost | — |  |  | — |  |  | — |  |  | — |
| $ | 10 |  |  | $ | 10 |  |  | $ | 21 |  |  | $ | 19 |
Total Retirement Expense | $ | 20 |  |  | $ | 18 |  |  | $ | 41 |  |  | $ | 37 |
Postretirement Obligations |  |  |  |  |  |  |
Service cost | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost | 2 |  |  | 2 |  |  | 4 |  |  | 4 |
Recognition of net actuarial gain | — |  |  | (1 | ) |  | — |  |  | (2 | )
Amortization of prior service cost | — |  |  | — |  |  | — |  |  | — |
| $ | 2 |  |  | $ | 1 |  |  | $ | 4 |  |  | $ | 2 |

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- Definition Tabular disclosure of the costs related to the various types of retirement plans including defined benefit pension plan cost, defined contribution plan cost, other postretirement benefit plan cost, and net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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