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Goodwill and Intangible Assets (Schedule of Intangible Assets) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross carrying amount | $ 300 | $ 276 |
Accumulated amortization | (54) | (46) |
Total intangible assets, net | 246 | 230 |
Asset Impairment Charges | 402 | 282 | $ 18
Wind Project [Member] |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Asset Impairment Charges | 69 |  |
Emission Allowances [Member] |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross carrying amount | 18 | 19 |
Renewable Energy Certificates [Member] |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross carrying amount | 168 | 148 |
Gas Coal And Power Contracts [Member] |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross carrying amount | 24 | 24 |
Accumulated amortization | (20) | (19) |
Renewable Operating and Development Projects [Member] |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross carrying amount | 84 | 79 |
Accumulated amortization | (29) | (22) |
Asset Impairment Charges |  | 69 |
Renewable Operating and Development Projects [Member] | Property, Plant and Equipment [Member] |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Asset Impairment Charges |  | 58 |
Renewable Operating and Development Projects [Member] | Finite-Lived Intangible Assets [Member] |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Asset Impairment Charges |  | 11 |
Renewable Operating and Development Projects [Member] | Wind Project [Member] |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross carrying amount |  | 18 |
Accumulated amortization |  | (7) |
Other Intangible Assets [Member] |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross carrying amount | 6 | 6 |
Accumulated amortization | (5) | (5) |
Duke Energy Carolinas [Member] |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross carrying amount | 46 | 39 |
Total intangible assets, net | 46 | 39 |
Asset Impairment Charges | 192 |  | 1
Duke Energy Carolinas [Member] | Emission Allowances [Member] |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross carrying amount | 0 | 1 |
Duke Energy Carolinas [Member] | Renewable Energy Certificates [Member] |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross carrying amount | 46 | 38 |
Progress Energy [Member] |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross carrying amount | 125 | 112 |
Total intangible assets, net | 125 | 112 |
Asset Impairment Charges | 87 | 156 | 7
Progress Energy [Member] | Emission Allowances [Member] |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross carrying amount | 5 | 5 |
Progress Energy [Member] | Renewable Energy Certificates [Member] |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross carrying amount | 120 | 107 |
Duke Energy Progress [Member] |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross carrying amount | 122 | 109 |
Total intangible assets, net | 122 | 109 |
Asset Impairment Charges | 33 | 19 | 1
Duke Energy Progress [Member] | Emission Allowances [Member] |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross carrying amount | 2 | 2 |
Duke Energy Progress [Member] | Renewable Energy Certificates [Member] |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross carrying amount | 120 | 107 |
Duke Energy Florida [Member] |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross carrying amount | 3 | 3 |
Total intangible assets, net | 3 | 3 |
Asset Impairment Charges | 54 | 138 | 6
Duke Energy Florida [Member] | Emission Allowances [Member] |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross carrying amount | 3 | 3 |
Duke Energy Ohio [Member] |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross carrying amount | 2 | 3 |
Total intangible assets, net | 2 | 3 |
Asset Impairment Charges |  | 1 |
Duke Energy Ohio [Member] | Emission Allowances [Member] |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross carrying amount | 0 | 0 |
Duke Energy Ohio [Member] | Renewable Energy Certificates [Member] |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross carrying amount | 2 | 3 |
Duke Energy Ohio [Member] | Other Intangible Assets [Member] |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross carrying amount | 0 | 0 |
Accumulated amortization | 0 | 0 |
Duke Energy Indiana [Member] |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross carrying amount | 36 | 37 |
Accumulated amortization | (20) | (19) |
Total intangible assets, net | 16 | 18 |
Asset Impairment Charges | 30 | 18 | $ 8
Duke Energy Indiana [Member] | Emission Allowances [Member] |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross carrying amount | 12 | 13 |
Duke Energy Indiana [Member] | Gas Coal And Power Contracts [Member] |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross carrying amount | 24 | 24 |
Accumulated amortization | (20) | (19) |
Piedmont Natural Gas [Member] |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross carrying amount | 3 | 3 |
Accumulated amortization | (3) | (3) |
Asset Impairment Charges |  | 7 |
Piedmont Natural Gas [Member] | Other Intangible Assets [Member] |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Gross carrying amount | 3 | 3 |
Accumulated amortization | $ (3) | $ (3) |

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