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Pension and Other Postretirement Benefits (Tables)
 3 Months Ended
Mar. 30, 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
 
First Quarter Ended
 
First Quarter Ended
 
March 30,
2018
 
March 31,
2017
 
March 30,
2018
 
March 31,
2017
 
(in millions)
Components of net periodic benefit cost:
 

 
 

 
 

 
 

Service cost
$
26

 
$
25

 
$
—

 
$
1

Interest cost
36

 
35

 
1

 
1

Expected return on plan assets
(56
)
 
(49
)
 
(1
)
 
(1
)
Amortization of net loss (gains)
19

 
16

 
(1
)
 
(1
)
Net periodic benefit cost
$
25


$
27


$
(1
)

$
—