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Investments in Unconsolidated Affiliates (Tables)
 12 Months Ended
Dec. 31, 2014
Equity Method Investments and Joint Ventures [Abstract]  
Investments in Equity Method Unconsolidated Affiliates
The following table presents Duke Energy’s investments in unconsolidated affiliates accounted for under the equity method, as well as the respective equity in earnings, by segment.
  
Years Ended December 31,
  
2014
 
2013
 
2012
(in millions)
Investments

 
Equity in earnings

 
Investments

 
Equity in earnings

 
Equity in earnings

Regulated Utilities
$
3

 
$
(3
)
 
$
4

 
$
(1
)
 
$
(5
)
International Energy
69

 
120

 
82

 
110

 
134

Commercial Power
258

 
10

 
252

 
7

 
14

Other
28

 
3

 
52

 
6

 
5

Total
$
358

 
$
130

 
$
390

 
$
122

 
$
148