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Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2015
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 September 30
Three Months
 
Nine Months
(In millions)
2015
 
2014
 
2015
 
2014
Pension cost (benefit)
 
 
 
 
 
 
 
Service cost
$
—

 
$
3

 
$
4

 
$
7

Interest cost on projected benefit obligation
29

 
33

 
85

 
99

Expected return on plan assets
(44
)
 
(48
)
 
(131
)
 
(144
)
Amortization of net actuarial loss
7

 
6

 
26

 
19

Net periodic pension cost (benefit)
$
(8
)
 
$
(6
)
 
$
(16
)
 
$
(19
)
 
 
 
 
 
 
 
 
Postretirement cost (benefit)
 
 
 
 
 
 
 
Interest cost on projected benefit obligation
$
—

 
$
—

 
$
—

 
$
1

Amortization of prior service credit
(1
)
 
—

 
(2
)
 
(9
)
Amortization of net actuarial loss
—

 
—

 
1

 
—

Curtailment gain
—

 
—

 
—

 
(86
)
Net periodic postretirement cost (benefit)
$
(1
)
 
$
—

 
$
(1
)
 
$
(94
)