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Retirement Plans
 6 Months Ended
Jun. 30, 2015
Compensation And Retirement Disclosure [Abstract]  
Retirement Plans

9.  Retirement Plans

Components of net periodic pension cost consisted of the following:

 

 

Three Months Ended

 

 

Six Months Ended

 

 

 

June 30,

 

 

June 30,

 

 

 

2015

 

 

2014

 

 

2015

 

 

2014

 

 

 

(In millions)

 

Service cost

 

$

18

 

 

$

13

 

 

$

35

 

 

$

25

 

Interest cost

 

 

26

 

 

 

24

 

 

 

52

 

 

 

49

 

Expected return on plan assets

 

 

(43

)

 

 

(40

)

 

 

(85

)

 

 

(80

)

Amortization of unrecognized net actuarial losses

 

 

20

 

 

 

7

 

 

 

39

 

 

 

15

 

Settlement loss

 

 

5

 

 

 

8

 

 

 

5

 

 

 

8

 

Pension expense

 

$

26

 

 

$

12

 

 

$

46

 

 

$

17

 

In 2015, the Corporation expects to contribute approximately $55 million to its funded pension plans.  Through June 30, 2015, the Corporation contributed approximately $27 million of this amount.