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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract] |
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, 2022, and 2021.
| 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 accumulated amortization | (8) |  |  | — |  |  | (1) |  |  | — |  |  | (1) |  |  | — |  |  | — |  |  | (2) |
Total intangible assets, net | $ | 265 |  |  | $ | 84 |  |  | $ | 132 |  |  | $ | 127 |  |  | $ | 5 |  |  | $ | 2 |  |  | $ | 2 |  |  | $ | 20 |
| December 31, 2021 |  |
|  |  | 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 | 204 |  |  | 73 |  |  | 131 |  |  | 131 |  |  | — |  |  | — |  |  | — |  |  | — |
Natural gas, coal and power contracts | 24 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 24 |  |  | — |
Other | 28 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total gross carrying amounts | 264 |  |  | 73 |  |  | 136 |  |  | 133 |  |  | 3 |  |  | — |  |  | 26 |  |  | — |
Accumulated amortization – natural gas, coal and power contracts | (24) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (24) |  |  | — |
Accumulated amortization – other | (4) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total accumulated amortization | (28) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (24) |  |  | — |
Total intangible assets, net | $ | 236 |  |  | $ | 73 |  |  | $ | 136 |  |  | $ | 133 |  |  | $ | 3 |  |  | $ | — |  |  | $ | 2 |  |  | $ | — |

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