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Goodwill and Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2016
Goodwill [Line Items]  
Goodwill By Reportable Operating Segment
The following table presents goodwill by reportable operating segment for Duke Energy.
Duke Energy
 
Electric Utilities

 
Gas Utilities

 
Commercial

 
 
(in millions)
and Infrastructure

 
and Infrastructure

 
Renewables

 
Total

Goodwill at December 31, 2015
$
15,656

 
$
294

 
$
122

 
$
16,072

Piedmont Acquisition(a)
1,723

 
1,630

 
—

 
3,353

Goodwill at December 31, 2016
$
17,379

 
$
1,924

 
$
122

 
$
19,425


(a)    Refer to Note 2 for more information on the purchase accounting related to the acquisition of Piedmont.
Schedule of Intangible Assets
The following tables show the carrying amount and accumulated amortization of intangible assets included in Other within Investments and Other Assets on the Consolidated Balance Sheets of the Duke Energy Registrants at December 31, 2016 and 2015.
 
December 31, 2016
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

Emission allowances
$
19

 
$
1

 
$
6

 
$
2

 
$
4

 
$
—

 
$
13

Renewable energy certificates
125

 
36

 
84

 
84

 
—

 
4

 
—

Gas, coal and power contracts
24

 
—

 
—

 
—

 
—

 
—

 
24

Renewable operating and development projects
97

 
—

 
—

 
—

 
—

 
—

 
—

Other  
6

 
—

 
—

 
—

 
—

 
—

 
—

Total gross carrying amounts
271

 
37

 
90

 
86

 
4

 
4

 
37

Accumulated amortization – gas, coal and power contracts
(17
)
 
—

 
—

 
—

 
—

 
—

 
(17
)
Accumulated amortization – renewable operating and development projects
(23
)
 
—

 
—

 
—

 
—

 
—

 
—

Accumulated amortization – other
(5
)
 
—

 
—

 
—

 
—

 
—

 
—

Total accumulated amortization
(45
)
 
—

 
—

 
—

 
—

 
—

 
(17
)
Total intangible assets, net
$
226


$
37


$
90


$
86


$
4


$
4


$
20

 
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

Renewable operating and development projects
115

 
—

 
—

 
—

 
—

 
—

 
—

Other  
2

 
—

 
—

 
—

 
—

 
—

 
—

Total gross carrying amounts
277

 
31

 
86

 
82

 
4

 
5

 
38

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

 
—

 
—

 
—

 
—

 
(16
)
Accumulated amortization – renewable operating and development projects
(18
)
 
—

 
—

 
—

 
—

 
—

 
—

Accumulated amortization – other
(1
)
 
—

 
—

 
—

 
—

 
—

 
—

Total accumulated amortization
(35
)
 
—

 
—

 
—

 
—

 
—

 
(16
)
Total intangible assets, net
$
242


$
31


$
86


$
82


$
4


$
5


$
22
Schedule of Amortization Expense
The following table presents amortization expense for gas, coal and power contracts, renewable operating projects and other intangible assets.
 
December 31,
(in millions)
2016

 
2015

 
2014

Duke Energy
$
6

 
$
5

 
$
6

Duke Energy Ohio
—

 
—

 
2

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 renewable assets, additional intangible acquisitions and other events.
(in millions)
2017

 
2018

 
2019

 
2020

 
2021

Duke Energy
$
5

 
$
5

 
$
5

 
$
5

 
$
5

Duke Energy Indiana
2

 
2

 
2

 
2

 
2