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Retirement Plans (Tables)
 3 Months Ended
Mar. 31, 2015
Retirement Plans [Abstract]  
Net Periodic Pension And OPEB Cost/(Benefit)

The components of our net periodic pension and OPEB cost/(benefit) were as follows for the three months ended March 31:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Pension

OPEB

Millions
2015 
2014 
2015 
2014 

Service cost

$
24 

$
18 

$
1 

$
1 

Interest cost

 
40 

 
39 

 
3 

 
4 

Expected return on plan assets

 
(64)

 
(58)

 

 -

 

 -

Amortization of:

 

 

 

 

 

 

 

 

      Prior service credit

 

 -

 

 -

 
(2)

 
(3)

      Actuarial loss

 
26 

 
17 

 
3 

 
2 

Net periodic pension cost

$
26 

$
16 

$
5 

$
4