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Goodwill And Other Intangibles (Tables) (Power [Member])
 12 Months Ended
Dec. 31, 2012
Power [Member]
  
Expenses Related To Emissions And Renewable Energy Requirements
Such expenses for the years ended December 31, 2012, 2011 and 2010 were as follows:
 
 
 
 
 
 
 
 
 
 
 
 
Years Ended December 31,
 
 
 
 
2012
 
2011
 
2010
 
 
 
 
Millions
 
 
Emissions Expense
 
$
5

 
$
35

 
$
52

 
 
Renewable Energy Expense
 
$
34

 
$
43

 
$
50