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Regulatory Matters (Duke Energy Florida Narrative) (Details) |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |
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Jan. 14, 2021 USD ($) | Jul. 01, 2020 USD ($) plant MW | Oct. 31, 2015 USD ($) MW | Dec. 31, 2018 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | May 19, 2020 USD ($) | Apr. 02, 2020 USD ($) | Dec. 19, 2019 USD ($) | Nov. 22, 2019 USD ($) | Apr. 30, 2019 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  | $ 14,062,000,000 | $ 15,018,000,000 |  |  |  |  |  |
Impairment charges |  |  |  |  |  |  |  | 984,000,000 | (8,000,000) | $ 402,000,000 |  |  |  |  |
Duke Energy Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  | 2,064,000,000 | 2,613,000,000 |  |  |  |  |  |
Impairment charges |  |  |  |  |  |  |  | (4,000,000) | (36,000,000) | $ 54,000,000 |  |  |  |  |
Hurricane Dorian Storm Damage | Duke Energy Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated storm costs, capital and operation maintenance |  |  |  |  |  |  |  |  | 167,000,000 |  |  |  | $ 169,000,000 |  |
FPSC | Duke Energy Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated fuel cost refund |  |  |  |  |  |  |  |  |  |  |  | $ 78,000,000 |  |  |
Solar generation capacity plants (in MW) | MW |  | 750 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of solar plants petition for approval | plant |  | 10 |  |  |  |  |  |  |  |  |  |  |  |  |
FPSC | 2021 Settlement | Duke Energy Florida | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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, percentage | 53.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved debt structure, percentage | 47.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, basis points, increase | 0.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contract asset, noncurrent | $ 173,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Future investments in new cost | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
FPSC | 2021 Settlement | Duke Energy Florida | US Treasury Securities | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, basis points, increase | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |
FPSC | 2021 Settlement | Duke Energy Florida | Minimum | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity, percentage | 8.85% |  |  |  |  |  |  |  |  |  |  |  |  |  |
FPSC | 2021 Settlement | Duke Energy Florida | Minimum | US Treasury Securities | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity, percentage | 9.85% |  |  |  |  |  |  |  |  |  |  |  |  |  |
FPSC | 2021 Settlement | Duke Energy Florida | Maximum | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity, percentage | 10.85% |  |  |  |  |  |  |  |  |  |  |  |  |  |
FPSC | 2021 Settlement | Duke Energy Florida | Maximum | US Treasury Securities | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity, percentage | 10.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |
FPSC | 2021 Settlement | Duke Energy Florida | Weighted Average | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity, percentage | 9.85% |  |  |  |  |  |  |  |  |  |  |  |  |  |
FPSC | Hurricane Michael Storm Damage | Duke Energy Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated storm costs, capital and operation maintenance |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 223,000,000
Amount of recovery costs sought |  |  |  |  |  |  |  |  |  |  | $ 188,000,000 |  |  | $ 191,000,000 |
Storm deferral - requested supplemental true-up |  |  |  |  |  |  |  |  |  |  | $ 3,000,000 |  |  |  |
FPSC | Hurricane Dorian Storm Damage | Duke Energy Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Storm Costs - Capital and Operation Maintenance |  |  |  |  |  |  |  | 145,000,000 |  |  |  |  |  |  |
Solar Plant | Duke Energy Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated cost of generation facilities to be built |  | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated cost of generation facilities to be built, period |  | 4 years |  |  |  |  |  |  |  |  |  |  |  |  |
Natural Gas Plant | Duke Energy Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated cost of generation facilities to be built |  |  | $ 1,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Natural gas generation capacity plants (in MW) | MW |  |  | 1,640 |  |  |  |  |  |  |  |  |  |  |  |
Cost of generation facilities to be built |  |  | $ 1,600,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Impairment charges |  |  |  | $ 60,000,000 |  |  |  |  |  |  |  |  |  |  |
Impairment cost reversal |  |  |  |  |  |  |  |  | 36,000,000 |  |  |  |  |  |
Storm cost deferrals |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  | 1,102,000,000 | 1,399,000,000 |  |  |  |  |  |
Storm cost deferrals | Duke Energy Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  | 108,000,000 | 413,000,000 |  |  |  |  |  |
Storm cost deferrals | Hurricane Michael Storm Damage | Duke Energy Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  | $ 80,000,000 | $ 204,000,000 |  |  |  |  |  |

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