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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Florida) (Details) $ in Millions | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2022 USD ($) | Jul. 31, 2020 USD ($) plant MW | Sep. 30, 2025 USD ($) | Dec. 31, 2024 USD ($) | Jan. 31, 2025 USD ($) | Aug. 01, 2024 USD ($) | Jul. 31, 2024 USD ($) | Apr. 30, 2022 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Regulatory assets |  |  | $ 14,077 | $ 14,220 |  |  |  |
Duke Energy Florida |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Regulatory assets |  |  | 2,113 | 2,064 |  |  |  |
Duke Energy Florida | Hurricanes Helene, Debby and Milton |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Regulatory assets |  |  | $ 103 | 936 |  |  |  |
Capital expenditures |  |  |  | 85 |  |  |  |
Duke Energy Florida | Solar Project |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Estimated cost of facilities |  | $ 1,100 |  |  |  |  |  |
FPSC | Duke Energy Florida |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Number of solar plants | plant |  | 10 |  |  |  |  |  |
Generation capacity (MW) | MW |  | 749 |  |  |  |  |  |
Storm Protection Plan | FPSC | Duke Energy Florida |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Cost reduction period (in years) | 10 years |  | 10 years |  |  |  |  |
Investment in transmission and distribution |  |  |  |  | $ 7,000 |  |  | $ 7,000
Cost reduction to transmission loop | $ 80 |  |  |  |  |  |  |
Hurricane Ian | FPSC | Duke Energy Florida | Hurricanes Helene, Debby and Milton |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Storm reserves |  |  |  | $ 1,100 |  | $ 132 | $ 63 |

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