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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Carolinas) (Details) $ in Millions |  |  |  |  |  | 1 Months Ended | 12 Months Ended | 36 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 14, 2025 | Jul. 01, 2025 USD ($) | Dec. 15, 2023 | Jan. 19, 2023 | Jun. 07, 2021 | Aug. 31, 2023 USD ($) | Dec. 14, 2026 USD ($) | Dec. 14, 2025 USD ($) | Dec. 14, 2024 USD ($) | Dec. 14, 2026 USD ($) | Oct. 30, 2025 USD ($) MW
Oconee Nuclear Station Subsequent License Renewal | NRC | Duke Energy Carolinas | Oconee Nuclear Station |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating license extension (in years) |  |  |  |  | 20 years |  |  |  |  |  |
2023 North Carolina Rate Case | NCUC | Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proposed rate period (in years) |  |  |  | 3 years |  |  |  |  |  |  |
Settlement rate, amount |  |  |  |  |  | $ 19,500 |  |  |  |  |
Settlement rate, period (in years) |  |  |  |  |  | 3 years |  |  |  |  |
Approved rate increase (decrease), amount |  |  |  |  |  |  |  |  | $ 436 |  |
Approved return on equity percentage (as a percent) |  |  | 10.10% |  |  |  |  |  |  |  |
Approved equity capital structure, percentage (as a percent) |  |  | 53.00% |  |  |  |  |  |  |  |
2023 North Carolina Rate Case | NCUC | Duke Energy Carolinas | Forecast |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Approved rate increase (decrease), amount |  |  |  |  |  |  | $ 158 | $ 174 |  | $ 768 |
2023 North Carolina Rate Case, Retail Allocated | NCUC | Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Settlement rate, amount |  |  |  |  |  | $ 4,600 |  |  |  |  |
2025 South Carolina Rate Case | PSCSC | Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  | $ 151 |  |  |  |  |  |  |  |  |
Requested return on equity (as a percent) |  | 10.85% |  |  |  |  |  |  |  |  |
Requested equity capital structure, percentage (as a percent) |  | 53.00% |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) (as a percent) |  | 7.70% |  |  |  |  |  |  |  |  |
Bad Creek Pumped Storage Hydroelectric Station License Renewal | Federal Energy Regulatory Commission (FERC) | Duke Energy Carolinas | Bad Creek Pumped Storage Hydroelectric Station |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating license extension (in years) | 50 years |  |  |  |  |  |  |  |  |  |
Anderson County Natural Gas CC Generating Facility | PSCSC | Duke Energy Carolinas and Third Parties | Subsequent event |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Generation capacity (MW) | MW |  |  |  |  |  |  |  |  |  |  | 1,365
Anderson County Natural Gas CC Generating Facility | PSCSC | Duke Energy Carolinas | Subsequent event |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Generation capacity (MW) | MW |  |  |  |  |  |  |  |  |  |  | 1,170
Expected total project cost |  |  |  |  |  |  |  |  |  |  | $ 3,200
Anderson County Natural Gas CC Generating Facility | PSCSC | North Carolina Electric Membership Corporation | Subsequent event |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Generation capacity (MW) | MW |  |  |  |  |  |  |  |  |  |  | 100
Anderson County Natural Gas CC Generating Facility | PSCSC | Central Electric Power Cooperative | Subsequent event |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Generation capacity (MW) | MW |  |  |  |  |  |  |  |  |  |  | 95

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