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Pension and Other Postretirement Benefits (Tables)
 9 Months Ended
Sep. 29, 2017
Pension and Other Postretirement 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
Third Quarter Ended
Year-to-Date Ended
Third Quarter Ended
Year-to-Date Ended
September 29,
2017
September 23,
2016
September 29,
2017
September 23,
2016
September 29,
2017
September 23,
2016
September 29,
2017
September 23,
2016
(in millions)
Components of net periodic benefit cost:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
26
 
$
25
 
$
84
 
$
80
 
$
1
 
$
—
 
$
2
 
$
1
 
Interest cost
 
35
 
 
32
 
 
106
 
 
101
 
 
2
 
 
1
 
 
4
 
 
4
 
Expected return on plan assets
 
(52
)
 
(47
)
 
(158
)
 
(149
)
 
(1
)
 
(1
)
 
(3
)
 
(3
)
Amortization of prior service credits
 
1
 
 
—
 
 
1
 
 
—
 
 
(1
)
 
—
 
 
(1
)
 
(1
)
Amortization of net loss (gains)
 
14
 
 
13
 
 
45
 
 
39
 
 
(1
)
 
(1
)
 
(2
)
 
(1
)
Curtailment loss(1)
 
2
 
 
—
 
 
2
 
 
—
 
 
—
 
 
—
 
 
—
 
 
—
 
Net periodic benefit cost
$
26
 
$
23
 
$
80
 
$
71
 
$
—
 
$
(1
)
$
—
 
$
—
 
 
 
(1)
During the quarterly period ended September 29, 2017, the Company recognized a $2 million pension curtailment loss related severance and restructuring activities in the Aerospace Systems segment.