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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Carolinas) (Details) - USD ($) $ in Millions |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 15, 2023 | Jan. 19, 2023 | Jun. 07, 2021 | Aug. 31, 2023 | Mar. 31, 2025 | Mar. 31, 2024 | Dec. 14, 2027 | Dec. 14, 2026 | Dec. 14, 2025 | Dec. 14, 2024
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Operation, maintenance and other |  |  |  |  | $ 1,499 | $ 1,380 |  |  |  |
Interest Expense |  |  |  |  | (889) | (817) |  |  |  |
Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Operation, maintenance and other |  |  |  |  | 484 | 452 |  |  |  |
Interest Expense |  |  |  |  | $ (200) | $ (180) |  |  |  |
Nuclear Regulatory Commission |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |
Public utilities, 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 |  |  |  |  |  |  | $ 768 | $ 158 | $ 174 |
2023 North Carolina Rate Case, Retail Allocated | NCUC | Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Settlement rate, amount |  |  |  | $ 4,600 |  |  |  |  |  |
Oconee Nuclear Station Subsequent License Renewal | Nuclear Regulatory Commission | Duke Energy Carolinas | Oconee Nuclear Station |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Operating license extension (in years) |  |  | 20 years |  |  |  |  |  |  |

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