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Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2019
Retirement Benefits [Abstract]  
Components of net periodic cost (benefit) The components of net periodic pension cost (benefit) are presented in the following table.
Three months ended March 31
 
 
 
(In millions)
2019
 
2018
Net periodic pension cost (benefit)
 
 
 
Service cost
$
—

 
$
—

Non-service cost (benefit):
 
 
 
Interest cost on projected benefit obligation
25

 
23

Expected return on plan assets
(36
)
 
(40
)
Amortization of net actuarial (gain) loss
10

 
9

Settlement loss
—

 
4

Total non-service cost (benefit)
(1
)
 
(4
)
Total net periodic pension cost (benefit)
$
(1
)
 
$
(4
)