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Pension and Other Postretirement Benefits
 6 Months Ended
Jun. 29, 2018
Retirement Benefits [Abstract]  
Pension and Other Postretirement Benefits
. Pension and Other Postretirement Benefits
The following table summarizes the components of net periodic benefit cost for the Company’s pension and other postretirement benefit plans.
 
Pension Plans
 
Postretirement Benefit Plans
 
Second Quarter Ended
 
First Half Ended
 
Second Quarter Ended
 
First Half Ended
 
June 29,
2018
 
June 30,
2017
 
June 29,
2018
 
June 30,
2017
 
June 29,
2018
 
June 30,
2017
 
June 29,
2018
 
June 30,
2017
 
(in millions)
Components of net periodic benefit cost:
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

Service cost
$
26

 
$
25

 
$
52

 
$
50

 
$
1

 
$
—

 
$
1

 
$
1

Interest cost
36

 
36

 
72

 
71

 
1

 
1

 
2

 
2

Expected return on plan assets
(56
)
 
(49
)
 
(112
)
 
(98
)
 
(1
)
 
(1
)
 
(2
)
 
(2
)
Amortization of net loss (gains)
18

 
15

 
37

 
31

 
(1
)
 
—

 
(2
)
 
(1
)
Net periodic benefit cost
$
24


$
27


$
49


$
54


$
—


$
—


$
(1
)

$
—

The components of net periodic benefit cost other than the service cost component are included in interest and other income, net, in the unaudited condensed consolidated statements of operations. Service cost is included in operating costs and expenses in the unaudited condensed consolidated statements of operations.
Contributions. The Company contributed cash of $28 million to its pension plans and $3 million to its other postretirement benefit plans during the first half period ended June 29, 2018. The Company expects to contribute an additional $72 million to its pension plans and $7 million to its other postretirement benefit plans during the remainder of 2018.