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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Progress) (Details) - Duke Energy Progress $ in Millions |  |  |  |  |  | 1 Months Ended | 12 Months Ended | 36 Months Ended
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Feb. 01, 2026 USD ($) | Jun. 12, 2025 USD ($) | Apr. 08, 2025 | Feb. 07, 2025 USD ($) MW | Aug. 18, 2023 USD ($) | Apr. 30, 2023 | Oct. 31, 2022 | Aug. 17, 2026 USD ($) | Aug. 17, 2025 USD ($) | Aug. 17, 2024 USD ($) | Aug. 17, 2026 USD ($)
2022 North Carolina Rate Case | NCUC |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Settlement rate, period (in years) |  |  |  |  | 3 years |  | 3 years |  |  |  |
Proposed rate period (in years) |  |  |  |  |  | 3 years |  |  |  |  |
Approved rate increase (decrease), amount |  |  |  |  |  |  |  |  | $ 126 | $ 233 |
Settlement rate, amount |  |  |  |  | $ 12,200 |  |  |  |  |  |
Approved return on equity percentage (as a percent) |  |  |  |  | 9.80% |  |  |  |  |  |
Approved equity capital structure, percentage (as a percent) |  |  |  |  | 53.00% |  |  |  |  |  |
2022 North Carolina Rate Case | NCUC | Forecast |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Approved rate increase (decrease), amount |  |  |  |  |  |  |  | $ 135 |  |  | $ 494
2022 North Carolina Rate Case, Retail Allocated | NCUC |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Settlement rate, amount |  |  |  |  | $ 3,500 |  |  |  |  |  |
Person County Cycle CPCN Proceeding | NCUC |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Generation capacity (MW) | MW |  |  |  | 1,360 |  |  |  |  |  |  |
Generation capacity, co-owned (MW) | MW |  |  |  | 225 |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  | $ 113 |  |  |  |  |  |  |
Requested rate increase (decrease) (as a percent) |  |  |  | 2.60% |  |  |  |  |  |  |
Robinson Subsequent License Renewal | NRC |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating license extension (in years) |  |  | 20 years |  |  |  |  |  |  |  |
2025 South Carolina Rate Case | PSCSC |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  | $ 75 |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) (as a percent) |  | 12.10% |  |  |  |  |  |  |  |  |
Requested return on equity (as a percent) |  | 10.85% |  |  |  |  |  |  |  |  |
Equity ratio (as a percent) |  | 53.00% |  |  |  |  |  |  |  |  |
2025 South Carolina Rate Case | PSCSC | Forecast | Subsequent event |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Approved rate increase (decrease), amount | $ 40 |  |  |  |  |  |  |  |  |  |
Approved return on equity percentage (as a percent) | 9.99% |  |  |  |  |  |  |  |  |  |
Approved equity capital structure, percentage (as a percent) | 53.00% |  |  |  |  |  |  |  |  |  |

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