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Regulatory Matters (Duke Energy Progress Narrative) (Details) - USD ($) $ in Millions |  |  |  |  | 7 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Oct. 06, 2022 | Sep. 01, 2022 | Jun. 16, 2022 | Oct. 16, 2020 | Dec. 31, 2025 | May 31, 2027 | May 31, 2026 | May 31, 2025 | May 31, 2024 | Dec. 31, 2022 | Dec. 31, 2021
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other, estimated useful life, in years |  |  |  |  |  |  |  |  |  | 15 years | 14 years
Duke Energy Progress | PSCSC | 2022 South Carolina Rate Case |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Approved rate increase (decrease) amount by state commission |  | $ 52 |  |  |  |  |  |  |  |  |
Duke Energy Progress | PSCSC | 2022 South Carolina Rate Case, Retail Rate Case |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred compliance costs period (in years) |  | 33 months |  |  |  |  |  |  |  |  |
Approved return on equity, percentage |  | 9.60% |  |  |  |  |  |  |  |  |
Approved rate increase (decrease) amount by state commission |  | $ 36 |  |  |  |  |  |  |  |  |
Duke Energy Progress | PSCSC | 2022 South Carolina Rate Case, Retail Rate Case | Equity |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Approved return on equity, percentage |  | 52.43% |  |  |  |  |  |  |  |  |
Duke Energy Progress | PSCSC | 2022 South Carolina Rate Case, Retail Rate Case | Debt |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Approved return on equity, percentage |  | 47.57% |  |  |  |  |  |  |  |  |
Duke Energy Progress | PSCSC | 2022 South Carolina Rate Case, Coal Ash Basin Closure Costs |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred compliance costs period (in years) |  | 7 years |  |  |  |  |  |  |  |  |
Deferred costs not recovering |  | $ 50 |  |  |  |  |  |  |  |  |
Duke Energy Progress | NCUC | 2022 North Carolina Rate Case |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proposed rate period (in years) | 3 years |  |  |  |  |  |  |  |  |  |
Duke Energy Progress | NCUC | 2022 North Carolina Rate Case | Forecast |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  | $ 615 |  | $ 138 | $ 151 | $ 326 |  |
Requested return on equity, percentage |  |  |  |  |  | 16.00% |  |  |  |  |
Duke Energy Progress | FERC | FERC Return on Equity Complaint, NCEMC |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Approved return on equity, percentage |  |  | 10.00% | 11.00% |  |  |  |  |  |  |

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