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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Carolinas) (Details) - Nuclear Regulatory Commission - contention |  |  |  |  | 6 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 27, 2021 | Jul. 28, 2021 | Jun. 07, 2021 | Jun. 06, 2021 | Jun. 30, 2022
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Operating license extension (in years) |  |  |  |  | 20 years
Duke Energy Carolinas | Oconee Nuclear Station Subsequent License Renewal |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Comment period (in days) |  | 60 days |  |  |
Number of contentions | 3 |  |  |  |
Duke Energy Carolinas | Oconee Nuclear Station Subsequent License Renewal | Oconee Nuclear Station |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Operating license extension (in years) |  |  | 20 years |  |
Operating license (in years) |  |  | 80 years | 60 years |

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