8. Retirement Benefit Plans
The components of net periodic benefit expense/(income) for our non-contributory qualified defined benefit pension plan (Primary Pension Plan), non-contributory supplemental pension plans and contributory postretirement health and welfare plan are as follows:
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($ in millions)
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Three Months Ended
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Six Months Ended
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August 3,
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July 28,
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August 3,
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July 28,
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Primary Pension Plan
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2013
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2012
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2013
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2012
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Service cost
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$
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19
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$
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23
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$
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39
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$
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46
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Interest cost
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51
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62
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102
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124
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Expected return on plan assets
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(85)
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(95)
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(170)
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(189)
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Amortization of actuarial loss/(gain)
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38
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58
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76
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116
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Amortization of prior service cost/(credit)
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2
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-
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3
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-
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Net periodic benefit expense/(income)
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$
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25
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$
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48
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$
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50
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$
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97
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Supplemental Pension Plans
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Service cost
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$
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-
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$
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1
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$
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-
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$
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1
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Interest cost
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3
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4
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6
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7
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Amortization of actuarial loss/(gain)
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6
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5
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12
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11
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Amortization of prior service cost/(credit)
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-
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-
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-
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-
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Net periodic benefit expense/(income)
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$
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9
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$
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10
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$
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18
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$
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19
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Primary and Supplemental Pension Plans Total
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Service cost
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$
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19
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$
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24
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$
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39
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$
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47
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Interest cost
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54
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66
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108
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131
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Expected return on plan assets
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(85)
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(95)
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(170)
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(189)
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Amortization of actuarial loss/(gain)
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44
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63
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88
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127
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Amortization of prior service cost/(credit)
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2
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-
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3
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-
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Net periodic benefit expense/(income)
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$
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34
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$
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58
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$
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68
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$
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116
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Postretirement Health and Welfare Plan
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Service cost
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$
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-
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$
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-
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$
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-
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$
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-
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Interest cost
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-
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1
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-
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1
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Amortization of actuarial loss/(gain)
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-
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-
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-
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-
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Amortization of prior service cost/(credit)
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(2)
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(3)
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(4)
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(7)
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Net periodic benefit expense/(income)
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$
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(2)
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$
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(2)
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$
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(4)
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$
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(6)
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Retirement Benefit Plans Total
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Service cost
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$
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19
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$
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24
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$
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39
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$
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47
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Interest cost
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54
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67
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108
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132
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Expected return on plan assets
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(85)
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(95)
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(170)
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(189)
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Amortization of actuarial loss/(gain)
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44
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63
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88
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127
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Amortization of prior service cost/(credit)
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-
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(3)
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(1)
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(7)
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Net periodic benefit expense/(income)
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$
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32
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$
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56
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$
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64
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$
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110
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Net periodic benefit expense/(income) for our noncontributory postretirement health and welfare plan is predominantly included in SG&A expense in the unaudited Consolidated Statements of Operations.
Defined Contribution Plans
Our defined contribution plans include a qualified Savings, Profit-Sharing and Stock Ownership Plan (401(k) plan), which includes a non-contributory retirement account, and a non-qualified contributory unfunded mirror savings plan offered to certain members of management. Total expense for our defined contribution plans for the second quarters of 2013 and 2012 was $12 million and $14 million, respectively, and was predominantly included in SG&A expenses in the unaudited Consolidated Statements of Operations. Total expense for the first six months of 2013 and 2012 was $26 million and $30 million, respectively.