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Goodwill and Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill By Reportable Operating Segment
The following table presents the goodwill by reportable operating segment included on Duke Energy's Condensed Consolidated Balance Sheets at September 30, 2017, and December 31, 2016.
 
Electric Utilities

 
Gas Utilities

 
Commercial

 
 
(in millions)
and Infrastructure

 
and Infrastructure

 
Renewables

 
Total

Goodwill Balance at December 31, 2016
$
17,379

 
$
1,924

 
$
122

 
$
19,425

Accumulated impairment charges (a)
—

 
—

 
(7
)
 
(7
)
Goodwill Balance at September 30, 2017
$
17,379

 
$
1,924

 
$
115

 
$
19,418


(a)
Duke Energy evaluated the recoverability of goodwill in the third quarter of 2017 and recorded an impairment of $7 million related to the Energy Management Solutions reporting unit within the Commercial Renewables segment. The fair value of the reporting unit was determined based on the market approach, which estimates fair value based on market comparables within the energy technologies industry.