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Goodwill and Intangible Assets (Goodwill By Reportable Operating Segment) (Details) - USD ($) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Aug. 31, 2020 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2020 | Dec. 31, 2019
Goodwill [Line Items] |  |  |  |  |
Goodwill, gross |  |  |  | $ 19,425,000,000 | $ 19,425,000,000
Accumulated impairment charges |  |  |  | (122,000,000) | (122,000,000)
Goodwill, net |  |  |  | 19,303,000,000 | 19,303,000,000
Impairment charges | $ 0 |  |  |  |
Electric Utilities and Infrastructure |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill, gross |  |  |  | 17,379,000,000 | 17,379,000,000
Goodwill, net |  |  |  | 17,379,000,000 | 17,379,000,000
Gas Utilities and Infrastructure |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill, gross |  |  |  | 1,924,000,000 | 1,924,000,000
Goodwill, net |  |  |  | 1,924,000,000 | 1,924,000,000
Commercial Renewables |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill, gross |  |  |  | 122,000,000 | 122,000,000
Accumulated impairment charges |  |  |  | (122,000,000) | (122,000,000)
Impairment charges |  | $ 93,000,000 | $ 29,000,000 |  |
Duke Energy Ohio |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Accumulated impairment charges |  |  |  | (216,000,000) | (216,000,000)
Goodwill, net |  |  |  | 920,000,000 | 920,000,000
Duke Energy Ohio | Electric Utilities and Infrastructure |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill, net |  |  |  | 596,000,000 | 596,000,000
Duke Energy Ohio | Gas Utilities and Infrastructure |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill, net |  |  |  | 324,000,000 | 324,000,000
Progress Energy |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill, net |  |  |  | 3,655,000,000 | 3,655,000,000
Progress Energy | Electric Utilities and Infrastructure |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Accumulated impairment charges |  |  |  | 0 |
Piedmont |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill, net |  |  |  | 49,000,000 | $ 49,000,000
Piedmont | Gas Utilities and Infrastructure |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Accumulated impairment charges |  |  |  | $ 0 |

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