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Goodwill and Intangible Assets (Goodwill By Reportable Operating Segment) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Goodwill [Line Items] |  |  |
Goodwill, Gross |  | $ 19,425 | $ 19,425
Goodwill [Roll Forward] |  |  |
Goodwill, balance at beginning of period |  | 19,396 |
Goodwill, Impaired, Accumulated Impairment Loss |  | (122) | (29)
Goodwill, balance at end of period |  | 19,303 |
Electric Utilities and Infrastructure [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Gross |  | 17,379 | 17,379
Goodwill [Roll Forward] |  |  |
Goodwill, balance at beginning of period |  | 17,379 |
Goodwill, balance at end of period |  | 17,379 |
Gas Utilities and Infrastructure [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Gross |  | 1,924 | 1,924
Goodwill [Roll Forward] |  |  |
Goodwill, balance at beginning of period |  | 1,924 |
Goodwill, balance at end of period |  | 1,924 |
Commercial Renewables [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Gross |  | 122 | 122
Goodwill [Roll Forward] |  |  |
Goodwill, balance at beginning of period |  | 93 |
Goodwill, Impaired, Accumulated Impairment Loss |  | (122) | (29)
Goodwill, Impairment Loss | $ 93 | 29 |
Duke Energy Ohio [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, balance at beginning of period |  | 920 |
Goodwill, Impaired, Accumulated Impairment Loss |  | (216) | $ (216)
Goodwill, balance at end of period |  | 920 |
Duke Energy Ohio [Member] | Electric Utilities and Infrastructure [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, balance at beginning of period |  | 596 |
Goodwill, balance at end of period |  | 596 |
Duke Energy Ohio [Member] | Gas Utilities and Infrastructure [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, balance at beginning of period |  | 324 |
Goodwill, balance at end of period |  | 324 |
Progress Energy [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, balance at beginning of period |  | 3,655 |
Goodwill, balance at end of period |  | 3,655 |
Piedmont Natural Gas [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, balance at beginning of period |  | 49 |
Goodwill, balance at end of period |  | $ 49 |

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