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Goodwill (Tables)
 9 Months Ended
Sep. 30, 2018
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, 2018, and December 31, 2017.
 
Electric Utilities

 
Gas Utilities

 
Commercial

 
 
(in millions)
and Infrastructure

 
and Infrastructure

 
Renewables

 
Total

Goodwill balance at December 31, 2017
$
17,379

 
$
1,924

 
$
122

 
$
19,425

Accumulated impairment charges
—

 
—

 
(29
)
 
$
(29
)
Goodwill balance at December 31, 2017, adjusted for accumulated impairment charges
$
17,379

 
$
1,924

 
$
93

 
$
19,396




 


 


 


Goodwill balance at September 30, 2018
$
17,379

 
$
1,924

 
$
122

 
$
19,425

Accumulated impairment charges
—

 
—

 
(122
)
 
(122
)
Goodwill balance at September 30, 2018, adjusted for accumulated impairment charges
$
17,379

 
$
1,924

 
$
—

 
$
19,303