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Taxes Other than Income Taxes (Tables)
 12 Months Ended
Dec. 31, 2012
Taxes Other Than Income Taxes [Abstract]  
Components of taxes other than income taxes
The following table provides the components of taxes other than income taxes:

 
 
2012
  
2011
  
2010
 
Regulatory Assessment
 
$
228
  
$
213
  
$
205
 
Property
  
342
   
332
   
321
 
Payroll, net of amounts capitalized
  
458
   
445
   
430
 
Capital Stock
  
151
   
216
   
203
 
Other
  
1
   
1
   
2
 
Total taxes other than income taxes
 
$
1,180
  
$
1,207
  
$
1,161