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Goodwill and Intangible Assets (Schedule of Intangible Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | $ 305 | $ 300
Accumulated amortization | (56) | (54)
Total intangible assets, net | 249 | 246
Emission allowances |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | 18 | 18
Renewable energy certificates |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | 172 | 168
Natural gas, coal and power contracts |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | 24 | 24
Accumulated amortization | (21) | (20)
Renewable operating and development projects |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | 89 | 84
Accumulated amortization | (34) | (29)
Other |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | 2 | 6
Accumulated amortization | (1) | (5)
Duke Energy Carolinas |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | 53 | 46
Total intangible assets, net | 53 | 46
Duke Energy Carolinas | Emission allowances |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | 0 | 0
Duke Energy Carolinas | Renewable energy certificates |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | 53 | 46
Progress Energy |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | 123 | 125
Total intangible assets, net | 123 | 125
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 | 118 | 120
Duke Energy Progress |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | 120 | 122
Total intangible assets, net | 120 | 122
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 | 118 | 120
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 | 2
Total intangible assets, net | 1 | 2
Duke Energy Ohio | Emission allowances |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | 0 | 0
Duke Energy Ohio | Renewable energy certificates |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | 1 | 2
Duke Energy Ohio | Other |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | 0 | 0
Accumulated amortization | 0 | 0
Duke Energy Indiana |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | 36 | 36
Accumulated amortization | (21) | (20)
Total intangible assets, net | 15 | 16
Duke Energy Indiana | Emission allowances |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | 12 | 12
Duke Energy Indiana | Natural gas, coal and power contracts |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount | 24 | 24
Accumulated amortization | $ (21) | (20)
Piedmont |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount |  | 3
Accumulated amortization |  | (3)
Piedmont | Other |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross carrying amount |  | 3
Accumulated amortization |  | $ (3)

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