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Goodwill and Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2018
Goodwill [Line Items]  
Goodwill By Reportable Operating Segment
The following table presents goodwill by reportable segment for Duke Energy included on Duke Energy's Consolidated Balance Sheets at December 31, 2018, and 2017.
 
Electric Utilities

 
Gas Utilities

 
Commercial

 
 
(in millions)
and Infrastructure

 
and Infrastructure

 
Renewables

 
Total

Goodwill Balance at December 31, 2017
$
17,379

 
$
1,924

 
$
122

 
$
19,425

Accumulated impairment charges(a)
—

 
—

 
(29
)
 
(29
)
Goodwill balance at December 31, 2017, adjusted for accumulated impairment charges
$
17,379

 
$
1,924

 
$
93

 
$
19,396

 
 
 
 
 
 
 
 
Goodwill Balance at December 31, 2018
$
17,379

 
$
1,924

 
$
122

 
$
19,425

Accumulated impairment charges(a)
$
—

 
$
—

 
$
(122
)
 
$
(122
)
Goodwill balance at December 31, 2018, adjusted for accumulated impairment charges
$
17,379

 
$
1,924

 
$
—

 
$
19,303


(a)
Duke Energy evaluated the recoverability of goodwill during 2017 and recorded impairment charges of $29 million related to the Energy Management Solutions reporting unit within the Commercial Renewables segment. The fair value of the reporting unit was determined based on the market approach. See "Goodwill Impairment Testing" below for the results of the 2018 goodwill impairment test.
Schedule of Intangible Assets
The following tables show the carrying amount and accumulated amortization of intangible assets included in Other within Other Noncurrent Assets on the Consolidated Balance Sheets of the Duke Energy Registrants at December 31, 2018, and 2017.
 
December 31, 2018
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
 
 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

 
 
(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

 
Piedmont

Emission allowances
$
18

 
$
—

 
$
5

 
$
2

 
$
3

 
$
—

 
$
12

 
$
—

Renewable energy certificates
168

 
46

 
120

 
120

 
—

 
2

 
—

 
—

Natural gas, coal and power contracts
24

 
—

 
—

 
—

 
—

 
—

 
24

 
—

Renewable operating and development projects
84

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Other
6

 
—

 
—

 
—

 
—

 
—

 
—

 
3

Total gross carrying amounts
300

 
46

 
125

 
122

 
3

 
2

 
36

 
3

Accumulated amortization – natural gas, coal and power contracts
(20
)
 
—

 
—

 
—

 
—

 
—

 
(20
)
 
—

Accumulated amortization – renewable operating and development projects
(29
)
 
—

 
—

 
—

 
—

 
—

 
—

 
—

Accumulated amortization – other
(5
)
 
—

 
—

 
—

 
—

 
—

 
—

 
(3
)
Total accumulated amortization
(54
)
 
—

 
—

 
—

 
—

 
—

 
(20
)
 
(3
)
Total intangible assets, net
$
246


$
46


$
125


$
122


$
3


$
2


$
16

 
$
—

 
December 31, 2017
 
 
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
 
 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

 
 
(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

 
Piedmont

Emission allowances
$
19

 
$
1

 
$
5

 
$
2

 
$
3

 
$
—

 
$
13

 
$
—

Renewable energy certificates
148

 
38

 
107

 
107

 
—

 
3

 
—

 
—

Natural gas, coal and power contracts
24

 
—

 
—

 
—

 
—

 
—

 
24

 
—

Renewable operating and development projects
79

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Other
6

 
—

 
—

 
—

 
—

 
—

 
—

 
3

Total gross carrying amounts
276

 
39

 
112

 
109

 
3

 
3

 
37

 
3

Accumulated amortization – natural gas, coal and power contracts
(19
)
 
—

 
—

 
—

 
—

 
—

 
(19
)
 
—

Accumulated amortization – renewable operating and development projects
(22
)
 
—

 
—

 
—

 
—

 
—

 
—

 
—

Accumulated amortization – other
(5
)
 
—

 
—

 
—

 
—

 
—

 
—

 
(3
)
Total accumulated amortization
(46
)
 
—

 
—

 
—

 
—

 
—

 
(19
)
 
(3
)
Total intangible assets, net
$
230


$
39


$
112


$
109


$
3


$
3


$
18

 
$
—