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Regulatory Matters (Duke Energy Florida Narrative) (Details) |  |  |  |  |  |  |  |  |  | 12 Months Ended |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 23, 2024 USD ($) | Jul. 15, 2024 solar_projects | Oct. 16, 2023 USD ($) | Jan. 23, 2023 USD ($) | Oct. 17, 2022 USD ($) | Oct. 04, 2022 USD ($) | Jun. 15, 2022 USD ($) | Jan. 14, 2021 USD ($) | Jul. 01, 2020 USD ($) plant MW | Dec. 31, 2026 USD ($) | Dec. 31, 2025 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Jan. 15, 2025 USD ($) | Dec. 27, 2024 USD ($) | Aug. 01, 2024 USD ($) | Jul. 31, 2024 USD ($) | Sep. 29, 2023 USD ($) | Aug. 30, 2023 outage | Sep. 28, 2022 outage | Sep. 27, 2022 USD ($) | Apr. 11, 2022 USD ($) | May 04, 2021 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Noncurrent Assets: Regulatory assets |  |  |  |  |  |  |  |  |  |  |  | $ 14,254,000,000 | $ 13,618,000,000 |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  | 12,263,000,000 | 12,622,000,000 | $ 11,419,000,000 |  |  |  |  |  |  |  |  |  |
Hurricane Ian |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Actual storm costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 431,000,000 |  |  |  |  |
Duke Energy Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Noncurrent Assets: Regulatory assets |  |  |  |  |  |  |  |  |  |  |  | 2,064,000,000 | 1,883,000,000 |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  | 2,449,000,000 | 2,529,000,000 | 2,247,000,000 |  |  |  |  |  |  |  |  |  |
Duke Energy Florida | Natural Disasters and Other Casualty Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Noncurrent Assets: Regulatory assets |  |  |  |  |  |  |  |  |  |  |  | 936,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  | 69,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Duke Energy Florida | Solar Plant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated cost of generation facilities to be built |  |  |  |  |  |  |  |  | $ 1,100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Duke Energy Florida | FPSC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of solar plants petition for approval | plant |  |  |  |  |  |  |  |  | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Solar generation capacity plants (in MW) | MW |  |  |  |  |  |  |  |  | 749 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Duke Energy Florida | FPSC | Natural Disasters and Other Casualty Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of outages | outage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,100,000 |  |  |
Duke Energy Florida | FPSC | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in transmission and distribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,000,000,000 |  |  |  |  |  |  |  |  |
Duke Energy Florida | 2021 Settlement | FPSC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved rate increase (decrease) amount by state commission |  |  |  |  |  |  |  |  |  |  |  | 79,000,000 | 49,000,000 | $ 67,000,000 |  |  |  |  |  |  |  |  |  |
Approved capital structure (as a percent) |  |  |  |  |  |  |  | 53.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, basis points, increase |  |  |  |  |  |  |  | 0.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contract asset, noncurrent |  |  |  |  |  |  | $ 154,000,000 | $ 173,000,000 |  |  |  | $ 32,000,000 | $ 141,000,000 |  |  |  |  |  |  |  |  |  |  | $ 173,000,000
Proceeds from legal settlements |  |  |  |  |  |  | $ 180,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  | $ 56,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Future investments in new cost |  |  |  |  |  |  |  | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Duke Energy Florida | 2021 Settlement | FPSC | US Treasury Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, basis points, increase |  |  |  |  |  |  |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Duke Energy Florida | 2021 Settlement | FPSC | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity (as a percent) |  |  |  |  |  |  |  | 8.85% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Duke Energy Florida | 2021 Settlement | FPSC | Minimum | US Treasury Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity (as a percent) |  |  |  |  |  |  |  | 9.85% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Duke Energy Florida | 2021 Settlement | FPSC | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity (as a percent) |  |  |  |  |  |  |  | 10.85% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Duke Energy Florida | 2021 Settlement | FPSC | Maximum | US Treasury Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity (as a percent) |  |  |  |  |  |  |  | 10.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Duke Energy Florida | 2021 Settlement | FPSC | Weighted Average |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity (as a percent) |  |  |  |  |  |  |  | 9.85% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Duke Energy Florida | Storm Protection Plan | FPSC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in transmission and distribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,000,000,000 |
Cost reduction to transmission loop |  |  |  |  |  | $ 80,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost reduction period (in years) |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Duke Energy Florida | Hurricane Ian | FPSC | Natural Disasters and Other Casualty Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Storm reserves |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,100,000,000 | $ 132,000,000 | $ 63,000,000 |  |  |  | $ 107,000,000 |  |
Interim recovery payments |  |  |  | $ 442,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Duke Energy Florida | Hurricane Idalia | FPSC | Natural Disasters and Other Casualty Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of customers impacted | outage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000 |  |  |  |
Interim recovery payments | $ 98,000,000 |  | $ 166,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Duke Energy Florida | Hurricane Idalia, Retail Portion | FPSC | Natural Disasters and Other Casualty Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interim recovery payments |  |  | 92,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Duke Energy Florida | Hurricane Idalia, Projected Costs | FPSC | Natural Disasters and Other Casualty Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interim recovery payments |  |  | $ 74,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Duke Energy Florida | 2024 Florida Rate Case | FPSC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of solar plants petition for approval | solar_projects |  | 12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Duke Energy Florida | 2024 Florida Rate Case | FPSC | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  |  |  |  |  | $ (59,000,000) | $ (203,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |
Duke Energy Florida | 2024 Florida Rate Case | FPSC | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity (as a percent) |  | 9.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Duke Energy Florida | 2024 Florida Rate Case | FPSC | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity (as a percent) |  | 11.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Duke Energy Florida | 2024 Florida Rate Case | FPSC | Weighted Average |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity (as a percent) |  | 10.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved capital structure (as a percent) |  | 53.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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