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Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2016
Compensation and Retirement Disclosure [Abstract]  
Components of net periodic cost (benefit)
The components of net periodic cost (benefit) are presented in the following table.
Periods ended June 30
Three Months
 
Six Months
(In millions)
2016
 
2015
 
2016
 
2015
Pension cost (benefit)
 
 
 
 
 
 
 
Service cost
$
—

 
$
2

 
$
—

 
$
4

Interest cost on projected benefit obligation
28

 
28

 
56

 
56

Expected return on plan assets
(40
)
 
(44
)
 
(80
)
 
(87
)
Amortization of net actuarial loss
10

 
10

 
19

 
19

Net periodic pension cost (benefit)
$
(2
)
 
$
(4
)
 
$
(5
)
 
$
(8
)