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Goodwill And Other Intangibles
 12 Months Ended
Dec. 31, 2018
Goodwill [Line Items]  
Goodwill And Other Intangibles
Goodwill and Other Intangibles
As of December 31, 2018 and 2017, Power had goodwill of $16 million related to the Bethlehem Energy Center facility. Power conducted an annual review for goodwill impairment in the fourth quarter of 2018 and concluded that goodwill continues to remain unimpaired. In addition to goodwill, as of December 31, 2018 and 2017, Power had intangible assets of $143 million and $114 million, respectively, related to emissions allowances and RECs. Emissions allowances and RECs are recorded at cost and evaluated for impairment at least annually. Emissions expense includes impairments of emissions allowances, if any, and costs for emissions, which is recorded as emissions occur. As load is served under contracts requiring energy from renewable sources, the related expense is recorded. The changes to Power’s intangible assets during 2017 and 2018 are presented in the following table:
 
 
 
 
 
 
 
 
 
 
 
 
Emissions Allowances
 
RECs
 
Total Other Intangibles
 
 
 
 
Millions
 
 
Balance as of January 1, 2017
 
$
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

 
 
Retirements
 
(26
)
 
(90
)
 
(116
)
 
 
Purchases
 
36

 
110

 
146

 
 
Sales and Transfers, net
 
—

 
(1
)
 
(1
)
 
 
Balance as of December 31, 2018
 
$
84

 
$
59

 
$
143

 
 
 
 
 
 
 
 
 
 
Power [Member]  
Goodwill [Line Items]  
Goodwill And Other Intangibles
Goodwill and Other Intangibles
As of December 31, 2018 and 2017, Power had goodwill of $16 million related to the Bethlehem Energy Center facility. Power conducted an annual review for goodwill impairment in the fourth quarter of 2018 and concluded that goodwill continues to remain unimpaired. In addition to goodwill, as of December 31, 2018 and 2017, Power had intangible assets of $143 million and $114 million, respectively, related to emissions allowances and RECs. Emissions allowances and RECs are recorded at cost and evaluated for impairment at least annually. Emissions expense includes impairments of emissions allowances, if any, and costs for emissions, which is recorded as emissions occur. As load is served under contracts requiring energy from renewable sources, the related expense is recorded. The changes to Power’s intangible assets during 2017 and 2018 are presented in the following table:
 
 
 
 
 
 
 
 
 
 
 
 
Emissions Allowances
 
RECs
 
Total Other Intangibles
 
 
 
 
Millions
 
 
Balance as of January 1, 2017
 
$
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

 
 
Retirements
 
(26
)
 
(90
)
 
(116
)
 
 
Purchases
 
36

 
110

 
146

 
 
Sales and Transfers, net
 
—

 
(1
)
 
(1
)
 
 
Balance as of December 31, 2018
 
$
84

 
$
59

 
$
143