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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Carolinas) (Details) - Duke Energy Carolinas - USD ($) $ in Millions |  |  | 4 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 31, 2023 | Jan. 19, 2023 | Dec. 31, 2026 | Aug. 31, 2026 | Aug. 31, 2025 | Aug. 31, 2024
2023 North Carolina Rate Case | NCUC |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Proposed rate period (in years) |  | 3 years |  |  |  |
2023 South Carolina Storm Securitization |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Storm costs | $ 171 |  |  |  |  |
Forecast | 2023 North Carolina Rate Case | NCUC |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  | $ 823 | $ 150 | $ 172 |
Requested return on equity (as a percent) |  |  | 15.70% |  |  |
Forecast | 2023 North Carolina Rate Case | NCUC | Subsequent event |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  | $ 501

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