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Pension and Other Postretirement Benefits (Tables)
 6 Months Ended
Jun. 29, 2018
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost
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
)

$
—