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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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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 |  |  | $ | — |

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