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Benefit Plans
 9 Months Ended
Sep. 30, 2013
Compensation and Retirement Disclosure [Abstract]  
Benefit Plans
Note H. Benefit Plans
The components of net periodic cost (benefit) are presented in the following table.
Net Periodic Cost (Benefit)
Periods ended September 30
Three Months
 
Nine Months
(In millions)
2013
 
2012
 
2013
 
2012
Pension cost (benefit)
 
 
 
 
 
 
 
Service cost
$
3

 
$
3

 
$
9

 
$
9

Interest cost on projected benefit obligation
30

 
34

 
90

 
101

Expected return on plan assets
(45
)
 
(43
)
 
(135
)
 
(128
)
Amortization of net actuarial (gain) loss
10

 
10

 
34

 
29

Settlement loss
3

 
—

 
3

 
—

Net periodic pension cost (benefit)
$
1

 
$
4

 
$
1

 
$
11

 
 
 
 
 
 
 
 
Postretirement cost (benefit)
 
 
 
 
 
 
 
Interest cost on projected benefit obligation
$
—

 
$
1

 
$
1

 
$
2

Amortization of prior service credit
(4
)
 
(4
)
 
(13
)
 
(13
)
Amortization of net actuarial (gain) loss
1

 
—

 
1

 
—

Net periodic postretirement cost (benefit)
$
(3
)
 
$
(3
)
 
$
(11
)
 
$
(11
)