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Benefit Plans (Tables)
 6 Months Ended
Jun. 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 June 30
Three Months
 
Six Months
(In millions)
2015
 
2014
 
2015
 
2014
Pension cost (benefit)
 
 
 
 
 
 
 
Service cost
$
2

 
$
1

 
$
4

 
$
4

Interest cost on projected benefit obligation
28

 
33

 
56

 
66

Expected return on plan assets
(44
)
 
(48
)
 
(87
)
 
(96
)
Amortization of net actuarial loss
10

 
7

 
19

 
13

Net periodic pension cost (benefit)
$
(4
)
 
$
(7
)
 
$
(8
)
 
$
(13
)
 
 
 
 
 
 
 
 
Postretirement cost (benefit)
 
 
 
 
 
 
 
Interest cost on projected benefit obligation
$
—

 
$
1

 
$
—

 
$
1

Amortization of prior service credit
(1
)
 
(5
)
 
(1
)
 
(9
)
Amortization of net actuarial loss
1

 
—

 
1

 
—

Curtailment gain
—

 
(86
)
 
—

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

 
$
(90
)
 
$
—

 
$
(94
)