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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Progress) (Details) - Duke Energy Progress - USD ($) $ in Millions |  |  | 7 Months Ended | 9 Months Ended | 12 Months Ended
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Oct. 06, 2022 | Sep. 01, 2022 | Dec. 31, 2025 | Dec. 31, 2025 | May 31, 2027 | May 31, 2026 | Mar. 31, 2026 | May 31, 2025 | Mar. 31, 2025 | May 31, 2024 | Mar. 31, 2024
2022 North Carolina Rate Case | NCUC |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proposed rate period (in years) | 3 years |  |  |  |  |  |  |  |  |  |
2022 North Carolina Rate Case | NCUC | Forecast |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  | $ 615 | $ 587 |  | $ 138 | $ 140 | $ 151 | $ 127 |  |
Requested return on equity (as a percent) |  |  |  | 15.00% | 16.00% |  |  |  |  |  |
2022 North Carolina Rate Case | NCUC | Forecast | Subsequent event |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  |  |  |  |  | $ 326 | $ 320
2022 South Carolina Rate Case | PSCSC |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Approved rate increase (decrease), amount |  | $ 52 |  |  |  |  |  |  |  |  |
2022 South Carolina Rate Case, Retail Rate Case | PSCSC |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Approved rate increase (decrease), amount |  | $ 36 |  |  |  |  |  |  |  |  |
Approved return on equity percentage (as a percent) |  | 9.60% |  |  |  |  |  |  |  |  |
2022 South Carolina Rate Case, Retail Rate Case | PSCSC | Equity |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Approved return on equity percentage (as a percent) |  | 52.43% |  |  |  |  |  |  |  |  |
2022 South Carolina Rate Case, Retail Rate Case | PSCSC | Debt |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Approved return on equity percentage (as a percent) |  | 47.57% |  |  |  |  |  |  |  |  |
2022 South Carolina Rate Case, Coal Ash Basin Closure Costs | PSCSC |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred compliance costs period (in years) |  | 7 years |  |  |  |  |  |  |  |  |
Deferred compliance costs |  | $ 50 |  |  |  |  |  |  |  |  |

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