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Retirement Plans (Tables)
 9 Months Ended
Sep. 30, 2018
Compensation And Retirement Disclosure [Abstract]  
Components of Net Periodic Pension Cost

Components of net periodic pension cost consisted of the following:

 

 

Three Months Ended

 

 

Nine Months Ended

 

 

 

September 30,

 

 

September 30,

 

 

 

2018

 

 

2017

 

 

2018

 

 

2017

 

 

 

(In millions)

 

Service cost

 

$

10

 

 

$

13

 

 

$

34

 

 

$

41

 

Interest cost

 

 

24

 

 

 

25

 

 

 

71

 

 

 

77

 

Expected return on plan assets

 

 

(49

)

 

 

(42

)

 

 

(147

)

 

 

(125

)

Amortization of unrecognized net actuarial losses

 

 

8

 

 

 

13

 

 

 

29

 

 

 

46

 

Curtailment gains

 

 

—

 

 

 

—

 

 

 

(2

)

 

 

—

 

Settlement loss

 

 

—

 

 

 

4

 

 

 

—

 

 

 

11

 

Pension (income) expense

 

$

(7

)

 

$

13

 

 

$

(15

)

 

$

50