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Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2019
Retirement Benefits [Abstract]  
Components of net periodic cost (benefit)
The components of net periodic pension cost (benefit) are presented in the following table.
Periods ended September 30
Three Months
 
Nine Months
(In millions)
2019
 
2018
 
2019
 
2018
Net periodic pension cost (benefit)
 
 
 
 
 
 
 
Service cost
$
—

 
$
—

 
$
—

 
$
—

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

 
23

 
75

 
70

Expected return on plan assets
(36
)
 
(40
)
 
(107
)
 
(120
)
Amortization of net actuarial (gain) loss
10

 
10

 
30

 
28

Settlement loss
—

 
—

 
—

 
5

Total non-service cost (benefit)
(1
)
 
(7
)
 
(2
)
 
(17
)
Total net periodic pension cost (benefit)
$
(1
)
 
$
(7
)
 
$
(2
)
 
$
(17
)