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Goodwill and Intangible Assets (Schedule of Intangible Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | $ 370 | $ 355
Accumulated amortization | (66) | (60)
Total intangible assets, net | 304 | 295
Emission allowances |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | 8 | 8
Renewable energy certificates |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | 204 | 196
Natural gas, coal and power contracts |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | 24 | 24
Accumulated amortization | (24) | (23)
Renewable operating and development projects |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | 106 | 107
Accumulated amortization | (38) | (34)
Other |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | 28 | 20
Accumulated amortization | (4) | (3)
Duke Energy Carolinas |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | 73 | 65
Total intangible assets, net | 73 | 65
Duke Energy Carolinas | Renewable energy certificates |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | 73 | 65
Progress Energy |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | 136 | 135
Total intangible assets, net | 136 | 135
Progress Energy | Emission allowances |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | 5 | 5
Progress Energy | Renewable energy certificates |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | 131 | 130
Duke Energy Progress |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | 133 | 132
Total intangible assets, net | 133 | 132
Duke Energy Progress | Emission allowances |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | 2 | 2
Duke Energy Progress | Renewable energy certificates |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | 131 | 130
Duke Energy Florida |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | 3 | 3
Total intangible assets, net | 3 | 3
Duke Energy Florida | Emission allowances |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | 3 | 3
Duke Energy Ohio |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount |  | 1
Total intangible assets, net |  | 1
Duke Energy Ohio | Renewable energy certificates |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount |  | 1
Duke Energy Indiana |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | 26 | 26
Accumulated amortization | (24) | (23)
Total intangible assets, net | 2 | 3
Duke Energy Indiana | Emission allowances |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | 2 | 2
Duke Energy Indiana | Natural gas, coal and power contracts |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | 24 | 24
Accumulated amortization | $ (24) | $ (23)

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