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Pension and Other Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 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
First Quarter Ended
First Quarter Ended
March 31,
2017
March 25,
2016
March 31,
2017
March 25,
2016
(in millions)
Components of net periodic benefit cost:
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
29
 
$
27
 
$
1
 
$
1
 
Interest cost
 
35
 
 
35
 
 
1
 
 
1
 
Expected return on plan assets
 
(53
)
 
(51
)
 
(1
)
 
(1
)
Amortization of prior service costs (credits)
 
—
 
 
—
 
 
—
 
 
(1
)
Amortization of net loss
 
16
 
 
13
 
 
(1
)
 
—
 
Net periodic benefit cost
$
27
 
$
24
 
$
—
 
$
—