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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
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, 2021, and 2020.
| Electric Utilities |  | Gas Utilities |  | Commercial |  |
(in millions) | and Infrastructure |  | and Infrastructure |  | Renewables |  | Total
Goodwill Balance at December 31, 2020 | $ | 17,379 |  |  | $ | 1,924 |  |  | $ | 122 |  |  | $ | 19,425 |
Accumulated impairment charges | — |  |  | — |  |  | (122) |  |  | (122) |
Goodwill balance at December 31, 2020, adjusted for accumulated impairment charges | $ | 17,379 |  |  | $ | 1,924 |  |  | $ | — |  |  | $ | 19,303 |
Goodwill Balance at December 31, 2021 | $ | 17,379 |  |  | $ | 1,924 |  |  | $ | 122 |  |  | $ | 19,425 |
Accumulated impairment charges | — |  |  | — |  |  | (122) |  |  | (122) |
Goodwill balance at December 31, 2021, adjusted for accumulated impairment charges | $ | 17,379 |  |  | $ | 1,924 |  |  | $ | — |  |  | $ | 19,303 |
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, 2021, and 2020.
| 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 |  |  | — |
Renewable operating and development projects | 106 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Other | 28 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total gross carrying amounts | 370 |  |  | 73 |  |  | 136 |  |  | 133 |  |  | 3 |  |  | — |  |  | 26 |  |  | — |
Accumulated amortization – natural gas, coal and power contracts | (24) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (24) |  |  | — |
Accumulated amortization – renewable operating and development projects | (38) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Accumulated amortization – other | (4) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total accumulated amortization | (66) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (24) |  |  | — |
Total intangible assets, net | $ | 304 |  |  | $ | 73 |  |  | $ | 136 |  |  | $ | 133 |  |  | $ | 3 |  |  | $ | — |  |  | $ | 2 |  |  | $ | — |
| December 31, 2020 |  |
|  |  | 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 | 196 |  |  | 65 |  |  | 130 |  |  | 130 |  |  | — |  |  | 1 |  |  | — |  |  | — |
Natural gas, coal and power contracts | 24 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 24 |  |  | — |
Renewable operating and development projects | 107 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Other | 20 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total gross carrying amounts | 355 |  |  | 65 |  |  | 135 |  |  | 132 |  |  | 3 |  |  | 1 |  |  | 26 |  |  | — |
Accumulated amortization – natural gas, coal and power contracts | (23) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (23) |  |  | — |
Accumulated amortization – renewable operating and development projects | (34) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Accumulated amortization – other | (3) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total accumulated amortization | (60) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (23) |  |  | — |
Total intangible assets, net | $ | 295 |  |  | $ | 65 |  |  | $ | 135 |  |  | $ | 132 |  |  | $ | 3 |  |  | $ | 1 |  |  | $ | 3 |  |  | $ | — |

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