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Regulatory Matters (Duke Energy Carolinas Narrative) (Details) $ in Millions |  |  |  |  |  | 7 Months Ended | 11 Months Ended | 12 Months Ended
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Oct. 06, 2022 | Sep. 27, 2021 contention | Jul. 28, 2021 | Jun. 07, 2021 | Jun. 06, 2021 | Dec. 31, 2025 USD ($) | Dec. 31, 2026 USD ($) | May 31, 2027 | May 31, 2026 USD ($) | Jan. 18, 2026 USD ($) | May 31, 2025 USD ($) | Jan. 18, 2025 USD ($) | May 31, 2024 USD ($) | Jan. 18, 2024 USD ($) | Dec. 31, 2022
Nuclear Regulatory Commission |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating license extension (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 years
Oconee Nuclear Station Subsequent License Renewal | Duke Energy Carolinas | Nuclear Regulatory Commission |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Comment period (in years) |  |  | 60 days |  |  |  |  |  |  |  |  |  |  |  |
Number of contentions | contention |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |
Oconee Nuclear Station Subsequent License Renewal | Duke Energy Carolinas | Oconee | Nuclear Regulatory Commission |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating license extension (in years) |  |  |  | 20 years |  |  |  |  |  |  |  |  |  |  |
Operating license (in years) |  |  |  | 80 years | 60 years |  |  |  |  |  |  |  |  |  |
2022 North Carolina Rate Case | Duke Energy Carolinas | NCUC | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  |  | $ 823 |  |  | $ 150 |  | $ 172 |  |  |
Requested return on equity, percentage |  |  |  |  |  |  | 15.70% |  |  |  |  |  |  |  |
2022 North Carolina Rate Case | Duke Energy Carolinas | NCUC | Subsequent Event | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 501 |
2022 North Carolina Rate Case | Duke Energy Progress | NCUC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proposed rate period (in years) | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
2022 North Carolina Rate Case | Duke Energy Progress | NCUC | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  | $ 615 |  |  | $ 138 |  | $ 151 |  | $ 326 |  |
Requested return on equity, percentage |  |  |  |  |  |  |  | 16.00% |  |  |  |  |  |  |

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