Pension and Other Postretirement Benefit Plans (Tables)
 3 Months Ended
Apr. 03, 2015
Pension and Other Postretirement Benefit Plans  
Periodic benefit cost, pension and other postretirement benefit plans
Net periodic benefit cost for our pension and other postretirement benefit plans consisted of the following (in millions):
 
Pension Benefits  
 
Other Benefits  
 
Three Months Ended
 
April 3,
2015

March 28,
2014

 
April 3,
2015

March 28,
2014

Service cost
$
67

$
67

 
$
7

$
6

Interest cost
95

101

 
9

11

Expected return on plan assets
(177
)
(178
)
 
(3
)
(3
)
Amortization of prior service cost (credit)
—

(1
)
 
(5
)
(4
)
Amortization of net actuarial loss
49

18

 
3

1

Total cost (credit) recognized in statements of income
$
34

$
7

 
$
11

$
11