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Pension and Other Postretirement Benefits (Tables)
 3 Months Ended
Mar. 29, 2019
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 29,
2019
 
March 30,
2018
 
March 29,
2019
 
March 30,
2018
 
(in millions)
Components of net periodic benefit cost:
 

 
 

 
 

 
 

Service cost
$
6

 
$
26

 
$
1

 
$
—

Interest cost
40

 
36

 
1

 
1

Expected return on plan assets
(49
)
 
(56
)
 
(1
)
 
(1
)
Amortization of prior service credits
(1
)
 
—

 
—

 
—

Amortization of net loss (gains)
11

 
19

 
(1
)
 
(1
)
Curtailment loss (1)
2

 
—

 
—

 
—

Net periodic benefit cost
$
9


$
25


$
—


$
(1
)
__________________
(1) 
During the quarterly period ended March 29, 2019, the Company recognized a $2 million pension curtailment loss related to severance and restructuring activities in the C&NS segment.