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Goodwill And Other Intangibles (Tables)
 12 Months Ended
Dec. 31, 2017
Power [Member]  
Goodwill [Line Items]  
Schedule of Intangibles
The changes to Power’s intangible assets during 2016 and 2017 are presented in the following table:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Emissions Allowances
 
Renewable Energy Credits
 
Total Other Intangibles
 
 
 
 
Millions
 
 
Balance as of January 1, 2016
 
$
62

 
$
40

 
$
102

 
 
Retirements
 
(6
)
 
(94
)
 
(100
)
 
 
Purchases
 
—

 
99

 
99

 
 
Sales and Transfers, net
 
(1
)
 
(1
)
 
(2
)
 
 
Impairments
 
(1
)
 
—

 
(1
)
 
 
Balance as of December 31, 2016
 
$
54

 
$
44

 
$
98

 
 
Retirements
 
(7
)
 
(93
)
 
(100
)
 
 
Purchases
 
27

 
90

 
117

 
 
Sales and Transfers, net
 
—

 
(1
)
 
(1
)
 
 
Balance as of December 31, 2017
 
$
74

 
$
40

 
$
114