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Goodwill and Intangible Assets (Schedule of Intangible Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | $ 355 | $ 305
Accumulated amortization | (60) | (56)
Total intangible assets, net | 295 | 249
Emission allowances |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | 8 | 18
Renewable energy certificates |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | 196 | 172
Natural gas, coal and power contracts |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | 24 | 24
Accumulated amortization | (23) | (21)
Renewable operating and development projects |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | 107 | 89
Accumulated amortization | (34) | (34)
Other |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | 20 | 2
Accumulated amortization | (3) | (1)
Duke Energy Carolinas |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | 65 | 53
Total intangible assets, net | 65 | 53
Duke Energy Carolinas | Renewable energy certificates |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | 65 | 53
Progress Energy |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | 135 | 123
Total intangible assets, net | 135 | 123
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 | 130 | 118
Duke Energy Progress |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | 132 | 120
Total intangible assets, net | 132 | 120
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 | 130 | 118
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 | 1
Total intangible assets, net | 1 | 1
Duke Energy Ohio | Renewable energy certificates |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | 1 | 1
Duke Energy Indiana |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | 26 | 36
Accumulated amortization | (23) | (21)
Total intangible assets, net | 3 | 15
Duke Energy Indiana | Emission allowances |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | 2 | 12
Duke Energy Indiana | Natural gas, coal and power contracts |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | 24 | 24
Accumulated amortization | $ (23) | $ (21)

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