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Goodwill and Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2015
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, 2014(a)
$
15,950

 
$
307

 
$
64

 
$
16,321

Foreign exchange and other changes  
—

 
(36
)
 
—

 
(36
)
Acquisitions
—

 
—

 
58

 
58

Goodwill at December 31, 2015
$
15,950

 
$
271

 
$
122

 
$
16,343
Schedule of Intangible Assets
The following tables show the carrying amount and accumulated amortization of intangible assets within Other on the Consolidated Balance Sheets of the Duke Energy Registrants at December 31, 2015 and 2014.
  
December 31, 2015
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

(in millions)  
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

Emission allowances  
$
20

 
$
1

 
$
6

 
$
2

 
$
4

 
$
—

 
$
14

Renewable energy certificates  
116

 
30

 
80

 
80

 
—

 
5

 
—

Gas, coal and power contracts  
24

 
—

 
—

 
—

 
—

 
—

 
24

Wind development rights  
115

 
—

 
—

 
—

 
—

 
—

 
—

Other     
68

 
—

 
—

 
—

 
—

 
—

 
—

Total gross carrying amounts  
343

 
31

 
86

 
82

 
4

 
5

 
38

Accumulated amortization – gas, coal and power contracts  
(16
)
 
—

 
—

 
—

 
—

 
—

 
(16
)
Accumulated amortization – wind development rights  
(18
)
 
—

 
—

 
—

 
—

 
—

 
—

Accumulated amortization – other  
(24
)
 
—

 
—

 
—

 
—

 
—

 
—

Total accumulated amortization  
(58
)
 
—

 
—

 
—

 
—

 
—

 
(16
)
Total intangible assets, net  
$
285


$
31


$
86


$
82


$
4


$
5


$
22

  
December 31, 2014
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

(in millions)  
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

Emission allowances  
$
23

 
$
1

 
$
7

 
$
3

 
$
4

 
$
—

 
$
16

Renewable energy certificates  
97

 
25

 
69

 
69

 
—

 
3

 
—

Gas, coal and power contracts  
24

 
—

 
—

 
—

 
—

 
—

 
24

Wind development rights  
97

 
—

 
—

 
—

 
—

 
—

 
—

Other     
76

 
—

 
—

 
—

 
—

 
—

 
—

Total gross carrying amounts  
317

 
26

 
76

 
72

 
4

 
3

 
40

Accumulated amortization – gas, coal and power contracts  
(15
)
 
—

 
—

 
—

 
—

 
—

 
(15
)
Accumulated amortization – wind development rights  
(14
)
 
—

 
—

 
—

 
—

 
—

 
—

Accumulated amortization – other  
(25
)
 
—

 
—

 
—

 
—

 
—

 
—

Total accumulated amortization  
(54
)
 
—

 
—

 
—

 
—

 
—

 
(15
)
Total intangible assets, net  
$
263


$
26


$
76


$
72


$
4


$
3


$
25
Schedule of Amortization Expense
The following table presents amortization expense for gas, coal and power contracts, wind development rights and other intangible assets.
  
December 31,
(in millions)
2015

 
2014

 
2013

Duke Energy
$
4

 
$
6

 
$
13

Duke Energy Ohio
—

 
2

 
8

Duke Energy Indiana
1

 
1

 
1
Schedule of Expected Amortization Expense
The amortization amounts discussed below are estimates and actual amounts may differ from these estimates due to such factors as changes in consumption patterns, sales or impairments of emission allowances or other intangible assets, delays in the in-service dates of wind assets, additional intangible acquisitions and other events.
(in millions)
2016

 
2017

 
2018

 
2019

 
2020

Duke Energy
$
8

 
$
8

 
$
8

 
$
7

 
$
7

Duke Energy Indiana
2

 
2

 
2

 
2

 
2