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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Florida) (Details) - Duke Energy Florida $ in Millions | Jul. 01, 2020 USD ($) plant MW | Sep. 30, 2020 USD ($) | May 19, 2020 USD ($) | Apr. 02, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 19, 2019 USD ($) | Nov. 22, 2019 USD ($) | Apr. 30, 2019 USD ($)
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FPSC |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Accelerated fuel cost refund |  |  |  | $ 78 |  |  |  |
Number of solar plants | plant | 10 |  |  |  |  |  |  |
Generation capacity (MW) | MW | 750 |  |  |  |  |  |  |
Hurricane Michael storm damage |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Estimated storm costs - capital and operation maintenance |  | $ 119 |  |  | $ 204 |  |  |
Hurricane Michael storm damage | FPSC |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Estimated storm costs - capital and operation maintenance |  |  |  |  |  |  |  | $ 223
Amount of recovery costs sought |  |  | $ 188 |  |  |  | $ 191 |
Requested supplemental true-up |  |  | $ 3 |  |  |  |  |
Hurricane Dorian storm damage |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Estimated storm costs - capital and operation maintenance |  | 38 |  |  | $ 167 |  |  |
Hurricane Dorian storm damage | FPSC |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Estimated storm costs - capital and operation maintenance |  |  |  |  |  | $ 169 |  |
Actual storm costs - capital and operation maintenance |  | $ 145 |  |  |  |  |  |
Solar Project |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Estimated cost of facilities | $ 1,000 |  |  |  |  |  |  |
Estimated cost of facilities period | 4 years |  |  |  |  |  |  |

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