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Goodwill and Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 2016
Goodwill [Line Items]  
Goodwill By Reportable Operating Segment
The following table presents goodwill by reportable operating segment for Duke Energy.
Duke Energy
 
Regulated

 
International

 
Commercial

 
 
(in millions)
Utilities

 
Energy

 
Portfolio

 
Total

Goodwill at December 31, 2015
$
15,950

 
$
271

 
$
122

 
$
16,343

Foreign exchange changes
—

 
14

 
—

 
14

Goodwill at June 30, 2016
$
15,950

 
$
285

 
$
122

 
$
16,357