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Goodwill And Other Intangibles (Tables)
 12 Months Ended
Dec. 31, 2016
Power [Member]  
Goodwill [Line Items]  
Expenses Related To Emissions And Renewable Energy Requirements
Such expenses for the years ended December 31, 2016, 2015 and 2014 were as follows:
 
 
 
 
 
 
 
 
 
 
 
 
Years Ended December 31,
 
 
 
 
2016
 
2015
 
2014
 
 
 
 
Millions
 
 
Emissions Expense
 
$
14

 
$
13

 
$
10

 
 
Renewable Energy Expense
 
$
95

 
$
91

 
$
59