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Retirement Plans
 3 Months Ended
Mar. 31, 2017
Compensation And Retirement Disclosure [Abstract]  
Retirement Plans

5. Retirement Plans

Components of net periodic pension cost consisted of the following:

 

 

Three Months Ended

 

 

 

March 31,

 

 

 

2017

 

 

2016

 

 

 

(In millions)

 

Service cost

 

$

14

 

 

$

16

 

Interest cost

 

 

26

 

 

 

28

 

Expected return on plan assets

 

 

(41

)

 

 

(42

)

Amortization of unrecognized net actuarial losses

 

 

17

 

 

 

16

 

Pension expense

 

$

16

 

 

$

18

 

In 2017, we expect to contribute $52 million to our funded pension plans.  Through March 31, 2017, we have contributed $14 million to these plans.