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Goodwill (Tables)
 3 Months Ended
Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill By Reportable Operating Segment
The following table presents the goodwill by reportable segment included on Duke Energy's Condensed Consolidated Balance Sheets at March 31, 2019, and December 31, 2018.
 
Electric Utilities

 
Gas Utilities

 
Commercial

 
 
(in millions)
and Infrastructure

 
and Infrastructure

 
Renewables

 
Total

Goodwill balance
$
17,379

 
$
1,924

 
$
122

 
$
19,425

Accumulated impairment charges
—

 
—

 
(122
)
 
(122
)
Goodwill, adjusted for accumulated impairment charges
$
17,379

 
$
1,924

 
$
—

 
$
19,303