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Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2020
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 June 30
Three Months
 
Six Months
(In millions)
2020
 
2019
 
2020
 
2019
Net periodic pension cost (benefit)
 
 
 
 
 
 
 
Interest cost on projected benefit obligation
$
20

 
$
25

 
$
40

 
$
50

Expected return on plan assets
(39
)
 
(35
)
 
(78
)
 
(71
)
Amortization of net actuarial (gain) loss
11

 
10

 
22

 
20

Settlement loss
1

 
—

 
2

 
—

Total net periodic pension cost (benefit)
$
(7
)
 
$
—

 
$
(14
)
 
$
(1
)