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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Carolinas and Duke Energy Progress) (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 21, 2025 | Jun. 07, 2021 | Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024 | Apr. 16, 2025
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Capital expenditures |  |  | $ 3,148 | $ 3,215 |  |
Regulatory assets |  |  | 14,200 |  | $ 14,254 |
Duke Energy Carolinas |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Capital expenditures |  |  | 1,019 | 952 |  |
Regulatory assets |  |  | 4,149 |  | 4,199 |
Duke Energy Carolinas | Hurricanes Debby and Helene |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Reduction in regulatory liabilities |  |  | 58 |  |  |
Duke Energy Carolinas | Hurricanes Debby and Helene | Minimum |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Storm restoration costs incurred |  |  | 554 |  |  |
Capital expenditures |  |  | 404 |  |  |
Duke Energy Progress |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Capital expenditures |  |  | 849 | 704 |  |
Regulatory assets |  |  | 4,573 |  | 4,555 |
Duke Energy Progress | Hurricanes Debby and Helene |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Reduction in regulatory liabilities |  |  | 38 |  |  |
Duke Energy Progress | Hurricanes Debby and Helene | Minimum |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Storm restoration costs incurred |  |  | 210 |  |  |
Capital expenditures |  |  | 152 |  |  |
Duke Energy Florida |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Capital expenditures |  |  | 559 | $ 669 |  |
Regulatory assets |  |  | 2,068 |  | 2,064 |
Duke Energy Florida | Hurricane Ian |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Capital expenditures |  |  |  |  | 74 |
Regulatory assets |  |  | 813 |  | 936 |
Duke Energy Carolinas and Duke Energy Progress | Hurricanes Debby and Helene |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Total expense incurred |  |  | 100 |  |  |
Duke Energy Carolinas and Duke Energy Progress | Hurricanes Debby and Helene | Minimum |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Storm restoration costs incurred |  |  | 764 |  |  |
Capital expenditures |  |  | $ 556 |  |  |
Nuclear Regulatory Commission |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Operating license extension (in years) |  |  | 20 years |  |  |
PSCSC | Duke Energy Carolinas | Hurricane Helene |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Total storm restoration costs | $ 604 |  |  |  |  |
Storm reserves | $ 25 |  |  |  |  |
Oconee Nuclear Station Subsequent License Renewal | Oconee Nuclear Station | Nuclear Regulatory Commission | Duke Energy Carolinas |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Operating license extension (in years) |  | 20 years |  |  |  |
Hurricanes Helene, Debby and Milton | NCUC | Duke Energy Carolinas | Hurricane Ian |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Storm reserves |  |  |  |  | 200 |
Hurricanes Helene, Debby and Milton | NCUC | Duke Energy Carolinas | Hurricane Ian | Subsequent event |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Storm reserves |  |  |  |  |  | $ 584
Hurricanes Helene, Debby and Milton | NCUC | Duke Energy Progress | Hurricane Ian |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Storm reserves |  |  |  |  | $ 100 |
Hurricanes Helene, Debby and Milton | NCUC | Duke Energy Progress | Hurricane Ian | Subsequent event |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Storm reserves |  |  |  |  |  | $ 461

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