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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Florida) (Details) outage in Millions, customer in Millions |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |
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Apr. 02, 2024 | 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 ($) plant MW | Jan. 31, 2024 | Dec. 31, 2027 USD ($) | Dec. 31, 2026 USD ($) | Dec. 31, 2025 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Mar. 31, 2024 USD ($) | Sep. 29, 2023 USD ($) | Aug. 30, 2023 customer | Jun. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Sep. 28, 2022 outage | Sep. 27, 2022 USD ($) | Apr. 11, 2022 USD ($)
Duke Energy Florida | Solar Project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated cost of facilities |  |  |  |  |  |  |  | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FPSC | Duke Energy Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of solar plants | plant |  |  |  |  |  |  |  | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Generation capacity (MW) | MW |  |  |  |  |  |  |  | 750 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2021 Settlement | FPSC | Duke Energy Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved rate increase (decrease), amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 49,000,000 | $ 67,000,000 |  |  |  |  |  |  |  |
Public utilities, approved equity capital structure, percentage (as a percent) |  |  |  |  |  |  | 53.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, basis points, increase, percentage |  |  |  |  |  |  | 0.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contract with customer, asset, after allowance for credit loss, noncurrent |  |  |  |  |  | $ 154,000,000 | $ 173,000,000 |  |  |  |  |  |  |  |  | $ 149,000,000 |  |  |  |  |  |  |
Capitalized contract cost during period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,000,000 |  |  |  | $ 54,000,000 |  |  |
Proceeds from legal settlements |  |  |  |  |  | $ 180,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  | $ (56,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Future investment in infrastructure |  |  |  |  |  |  | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2021 Settlement | FPSC | Duke Energy Florida | US Treasury Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, basis points, increase, percentage |  |  |  |  |  |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2021 Settlement | FPSC | Duke Energy Florida | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity percentage (as a percent) |  |  |  |  |  |  | 8.85% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2021 Settlement | FPSC | Duke Energy Florida | Minimum | US Treasury Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity percentage (as a percent) |  |  |  |  |  |  | 9.85% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2021 Settlement | FPSC | Duke Energy Florida | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity percentage (as a percent) |  |  |  |  |  |  | 10.85% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2021 Settlement | FPSC | Duke Energy Florida | Maximum | US Treasury Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity percentage (as a percent) |  |  |  |  |  |  | 10.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2021 Settlement | FPSC | Duke Energy Florida | Weighted Average |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity percentage (as a percent) |  |  |  |  |  |  | 9.85% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2021 Settlement | FPSC | Duke Energy Florida | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved rate increase (decrease), amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 79,000,000 |  |  |  |  |  |  |  |  |  |
Contract with customer, asset, after allowance for credit loss, noncurrent |  |  |  |  |  |  |  |  |  |  |  |  | $ 24,000,000 |  |  |  |  |  |  |  |  |  |
Storm Protection Plan | FPSC | Duke Energy Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hurricane Ian |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Actual storm costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 431,000,000 |  |  |  |  |  |
Hurricane Ian | FPSC | Duke Energy Florida | Hurricane Ian |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of outages | outage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.1 |  |
Storm reserves |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 132,000,000 |  |  | $ 107,000,000 |
Interim recovery payments |  |  | $ 442,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hurricane Idalia | FPSC | Duke Energy Florida | Hurricane Ian |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interim recovery payments |  | $ 74,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hurricane Idalia, Retail Portion | FPSC | Duke Energy Florida | Hurricane Ian |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interim recovery payments |  | 92,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hurricane Idalia | FPSC | Duke Energy Florida | Hurricane Ian |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interim recovery payments |  | $ 166,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of impacted customers | customer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.2 |  |  |  |  |
2022 North Carolina Rate Case | FPSC | Duke Energy Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) (as a percent) |  |  |  |  |  |  |  |  | 4.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
2022 North Carolina Rate Case | FPSC | Duke Energy Florida | Weighted Average | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity percentage (as a percent) | 11.15% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, approved equity capital structure, percentage (as a percent) | 53.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2022 North Carolina Rate Case | FPSC | Duke Energy Florida | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  |  |  |  |  | $ 129,000,000 | $ 98,000,000 | $ 593,000,000 |  |  |  |  |  |  |  |  |  |  |

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