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Goodwill And Other Intangibles (Tables) (Power [Member])
 12 Months Ended
Dec. 31, 2014
Power [Member]
  
Goodwill [Line Items]  
Expenses Related To Emissions And Renewable Energy Requirements
Such expenses for the years ended December 31, 2014, 2013 and 2012 were as follows:
 
 
 
 
 
 
 
 
 
 
 
 
Years Ended December 31,
 
 
 
 
2014
 
2013
 
2012
 
 
 
 
Millions
 
 
Emissions Expense
 
$
10

 
$
6

 
$
5

 
 
Renewable Energy Expense
 
$
59

 
$
26

 
$
34