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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Carolinas and Duke Energy Progress) (Details) $ in Millions |  |  |  |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 27, 2021 contention | Jul. 28, 2021 | Jun. 07, 2021 | Jun. 06, 2021 | Mar. 31, 2023 | Apr. 20, 2023 USD ($) | Aug. 05, 2022 USD ($)
Nuclear Regulatory Commission |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Operating license extension (in years) |  |  |  |  | 20 years |  |
Oconee Nuclear Station Subsequent License Renewal | Nuclear Regulatory Commission | Duke Energy Carolinas |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Comment period (in days) |  | 60 days |  |  |  |  |
Number of contentions | contention | 3 |  |  |  |  |  |
Oconee Nuclear Station Subsequent License Renewal | Oconee Nuclear Station | Nuclear Regulatory Commission | Duke Energy Carolinas |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Operating license extension (in years) |  |  | 20 years |  |  |  |
Operating license (in years) |  |  | 80 years | 60 years |  |  |
Storm Cost Securitization Legislation | PSCSC | Duke Energy Progress |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Deferred storm costs |  |  |  |  |  |  | $ 223
Storm Cost Securitization Legislation | PSCSC | Duke Energy Progress | Subsequent event |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Deferred storm costs |  |  |  |  |  | $ 171 |

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