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Goodwill and Intangible Assets | 12 Months Ended
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Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets | GOODWILL AND INTANGIBLE ASSETS GOODWILL Duke Energy Duke Energy's Goodwill balance of $19.3 billion is allocated $17.4 billion to EU&I and $1.9 billion to GU&I on Duke Energy's Consolidated Balance Sheets at December 31, 2023, and 2022. There are no accumulated impairment charges. Duke Energy Ohio Duke Energy Ohio's Goodwill balance of $920 million, allocated $596 million to EU&I and $324 million to GU&I, is presented net of accumulated impairment charges of $216 million on the Consolidated Balance Sheets at December 31, 2023, and 2022. Progress Energy Progress Energy's Goodwill is included in the EU&I segment and there are no accumulated impairment charges. Piedmont Piedmont's Goodwill is included in the GU&I segment and there are no accumulated impairment charges. Goodwill Impairment Testing Duke Energy, Progress Energy, Duke Energy Ohio and Piedmont are required to perform an annual goodwill impairment test as of the same date each year and, accordingly, perform their annual impairment testing of goodwill as of August 31. Duke Energy, Progress Energy, Duke Energy Ohio and Piedmont update their test between annual tests if events or circumstances occur that would more likely than not reduce the fair value of a reporting unit below its carrying value. As the fair value for Duke Energy, Progress Energy, Duke Energy Ohio and Piedmont exceeded their respective carrying values at the date of the annual impairment analysis, no goodwill impairment charges were recorded in 2023. 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, 2023, and 2022.
| December 31, 2023
|  |  | Duke |  |  |  | Duke |  | Duke |  | Duke |  | Duke |  |
| Duke |  | Energy |  | Progress |  | Energy |  | Energy |  | Energy |  | Energy |  |
(in millions) | Energy |  | Carolinas |  | Energy |  | Progress |  | Florida |  | Ohio |  | Indiana |  | Piedmont
Emission allowances | $ | 8 |  |  | $ | — |  |  | $ | 5 |  |  | $ | 2 |  |  | $ | 3 |  |  | $ | — |  |  | $ | 2 |  |  | $ | — |
Renewable energy certificates | 232 |  |  | 97 |  |  | 133 |  |  | 133 |  |  | — |  |  | 2 |  |  | — |  |  | — |
Other | 56 |  |  | — |  |  | 5 |  |  | 1 |  |  | 3 |  |  | — |  |  | — |  |  | 22 |
Total gross carrying amounts | 296 |  |  | 97 |  |  | 143 |  |  | 136 |  |  | 6 |  |  | 2 |  |  | 2 |  |  | 22 |
Accumulated amortization – other | (14) |  |  | — |  |  | (3) |  |  | — |  |  | (3) |  |  | — |  |  | — |  |  | (6) |
Total intangible assets, net | $ | 282 |  |  | $ | 97 |  |  | $ | 140 |  |  | $ | 136 |  |  | $ | 3 |  |  | $ | 2 |  |  | $ | 2 |  |  | $ | 16 |
| December 31, 2022 |  |
|  |  | Duke |  |  |  | Duke |  | Duke |  | Duke |  | Duke |  |
| Duke |  | Energy |  | Progress |  | Energy |  | Energy |  | Energy |  | Energy |  |
(in millions) | Energy |  | Carolinas |  | Energy |  | Progress |  | Florida |  | Ohio |  | Indiana |  | Piedmont
Emission allowances | $ | 8 |  |  | $ | — |  |  | $ | 5 |  |  | $ | 2 |  |  | $ | 3 |  |  | $ | — |  |  | $ | 2 |  |  | $ | — |
Renewable energy certificates | 210 |  |  | 84 |  |  | 124 |  |  | 124 |  |  | — |  |  | 2 |  |  | — |  |  | — |
Other | 55 |  |  | — |  |  | 4 |  |  | 1 |  |  | 3 |  |  | — |  |  | — |  |  | 22 |
Total gross carrying amounts | 273 |  |  | 84 |  |  | 133 |  |  | 127 |  |  | 6 |  |  | 2 |  |  | 2 |  |  | 22 |
Accumulated amortization – other | (8) |  |  | — |  |  | (1) |  |  | — |  |  | (1) |  |  | — |  |  | — |  |  | (2) |
Total intangible assets, net | $ | 265 |  |  | $ | 84 |  |  | $ | 132 |  |  | $ | 127 |  |  | $ | 5 |  |  | $ | 2 |  |  | $ | 2 |  |  | $ | 20 |
Amortization Expense Amortization expense amounts for other intangible assets are immaterial for the years ended December 31, 2023, 2022 and 2021, and are expected to be immaterial for the next five years as of December 31, 2023.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 350 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//350/tableOfContent + Details
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