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Goodwill and Intangible Assets (Narrative) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
Goodwill [Line Items] |  |
Goodwill | $ 19,303,000,000 | $ 19,303,000,000
Goodwill accumulated impairment loss | 122,000,000 | 122,000,000
Impairment charges | 0 |
Electric Utilities and Infrastructure |  |
Goodwill [Line Items] |  |
Goodwill | 17,379,000,000 | 17,379,000,000
Gas Utilities and Infrastructure |  |
Goodwill [Line Items] |  |
Goodwill | 1,924,000,000 | 1,924,000,000
Duke Energy Ohio |  |
Goodwill [Line Items] |  |
Goodwill | 920,000,000 | 920,000,000
Goodwill accumulated impairment loss | 216,000,000 | 216,000,000
Duke Energy Ohio | Electric Utilities and Infrastructure |  |
Goodwill [Line Items] |  |
Goodwill | 596,000,000 | 596,000,000
Duke Energy Ohio | Gas Utilities and Infrastructure |  |
Goodwill [Line Items] |  |
Goodwill | 324,000,000 | 324,000,000
Progress Energy |  |
Goodwill [Line Items] |  |
Goodwill | 3,655,000,000 | 3,655,000,000
Progress Energy | Electric Utilities and Infrastructure |  |
Goodwill [Line Items] |  |
Goodwill accumulated impairment loss | 0 |
Piedmont |  |
Goodwill [Line Items] |  |
Goodwill | 49,000,000 | $ 49,000,000
Piedmont | Gas Utilities and Infrastructure |  |
Goodwill [Line Items] |  |
Goodwill accumulated impairment loss | $ 0 |

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