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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Florida) (Details) - Duke Energy Florida |  |  |  |  |  | 3 Months Ended | 12 Months Ended |  |  |  |
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Oct. 17, 2022 USD ($) | Oct. 04, 2022 USD ($) | Jun. 15, 2022 USD ($) | May 04, 2021 USD ($) | Jul. 01, 2020 USD ($) plant MW | Mar. 31, 2023 USD ($) | Dec. 31, 2034 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Sep. 28, 2022 outage | Sep. 27, 2022 USD ($) | Apr. 11, 2022 USD ($)
Solar Project |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated cost of facilities |  |  |  |  | $ 1,000,000,000 |  |  |  |  |  |  |
FPSC |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of solar plants | plant |  |  |  |  | 10 |  |  |  |  |  |  |
Generation capacity (MW) | MW |  |  |  |  | 750 |  |  |  |  |  |  |
FPSC | Hurricane Ian |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of outages | outage |  |  |  |  |  |  |  |  |  | 1,100,000 |  |
Deferred storm coats |  |  |  |  |  | $ 357,000,000 |  |  |  |  |  |
Storm reserves |  |  |  |  |  |  |  |  | $ 132,000,000 |  | $ 107,000,000 |
Interim recovery payments |  |  |  |  |  | 442,000,000 |  |  |  |  |  |
2021 Settlement | FPSC |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Approved rate increase (decrease), amount |  |  |  |  |  | 67,000,000 |  |  |  |  |  |
Public utilities, approved equity capital structure, percentage (as a percent) |  |  |  | 53.00% |  |  |  |  |  |  |  |
Public utilities, approved debt capital structure, percentage |  |  |  | 47.00% |  |  |  |  |  |  |  |
Public utilities, basis points, increase, percentage |  |  |  | 0.25% |  |  |  |  |  |  |  |
Contract with customer, asset, after allowance for credit loss, noncurrent |  |  | $ 154,000,000 | $ 173,000,000 |  | $ 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 | US Treasury Securities |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, basis points, increase, percentage |  |  |  | 0.50% |  |  |  |  |  |  |  |
2021 Settlement | FPSC | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity percentage (as a percent) |  |  |  | 8.85% |  |  |  |  |  |  |  |
2021 Settlement | FPSC | Minimum | US Treasury Securities |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity percentage (as a percent) |  |  |  | 9.85% |  |  |  |  |  |  |  |
2021 Settlement | FPSC | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity percentage (as a percent) |  |  |  | 10.85% |  |  |  |  |  |  |  |
2021 Settlement | FPSC | Maximum | US Treasury Securities |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity percentage (as a percent) |  |  |  | 10.10% |  |  |  |  |  |  |  |
2021 Settlement | FPSC | Weighted Average |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity percentage (as a percent) |  |  |  | 9.85% |  |  |  |  |  |  |  |
2021 Settlement | FPSC | Forecast |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Approved rate increase (decrease), amount |  |  |  |  |  |  | $ 79,000,000 | $ 49,000,000 |  |  |  |
Contract with customer, asset, after allowance for credit loss, noncurrent |  |  |  |  |  |  |  | $ 119,000,000 |  |  |  |
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 |  |  |  |  |  |  |  |  |  |

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