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Regulatory Matters (Duke Energy Florida Narrative) (Details) customer in Thousands, $ in Millions |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 13, 2019 USD ($) | Mar. 25, 2019 USD ($) | Dec. 27, 2018 USD ($) | Jul. 31, 2018 USD ($) | May 31, 2018 USD ($) | Jan. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2018 USD ($) MW | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Nov. 22, 2019 USD ($) | Jan. 29, 2019 USD ($) | Oct. 31, 2018 customer | Sep. 30, 2017 customer | Oct. 31, 2015 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net property, plant and equipment |  |  |  |  |  |  | $ 102,127 |  | $ 91,694 | $ 102,127 | $ 91,694 |  |  |  |  |  |
Operation, maintenance and other |  |  |  |  |  |  |  |  |  | 6,066 | 6,463 | $ 5,944 |  |  |  |  |
Regulatory assets |  |  |  |  |  |  | 15,018 |  | 15,622 | 15,018 | 15,622 |  |  |  |  |  |
Remaining net book value |  |  |  |  |  |  | 102,127 |  | 91,694 | 102,127 | 91,694 |  |  |  |  |  |
Impairment charges |  |  |  |  |  |  |  |  |  | (8) | 402 | 282 |  |  |  |  |
Reduction of prior year impairment |  |  |  |  |  |  | (14) | $ 25 |  | 11 |  |  |  |  |  |  |
Duke Energy Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net property, plant and equipment |  |  |  |  |  |  | 15,221 |  | 13,824 | 15,221 | 13,824 |  |  |  |  |  |
Operation, maintenance and other |  |  |  |  |  |  |  |  |  | 1,034 | 1,025 | 853 |  |  |  |  |
Regulatory assets |  |  |  |  |  |  | 2,613 |  | 2,888 | 2,613 | 2,888 |  |  |  |  |  |
Remaining net book value |  |  |  |  |  |  | 15,221 |  | 13,824 | 15,221 | 13,824 |  |  |  |  |  |
Impairment charges |  |  |  |  |  |  |  |  |  | (36) | 54 | $ 138 |  |  |  |  |
Storm Restoration Cost Recovery | Duke Energy Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customers experiencing outages | customer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000 |
Estimated storm costs, capital and operation maintenance |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 508 |  |  |
Allowed storm reserve |  |  |  |  | $ 132 |  |  |  |  |  |  |  |  |  |  |  |
Net property, plant and equipment | $ 18 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operation, maintenance and other | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in storm reserve | $ (24) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hurricane Michael Storm Damage | Duke Energy Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customers experiencing outages | customer |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 72 |  |
Estimated storm costs, capital and operation maintenance |  |  |  |  |  |  | 311 |  |  | 311 |  |  |  |  |  |  |
Amount of recovery costs sought |  |  |  |  |  |  |  |  |  |  |  |  | $ 191 |  |  |  |
Net property, plant and equipment |  |  |  |  |  |  | 107 |  | $ 35 | 107 | 35 |  |  |  |  |  |
Hurricane Dorian Storm Damage | Duke Energy Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated storm costs, capital and operation maintenance |  |  |  |  |  |  | 167 |  |  | 167 |  |  |  |  |  |  |
FPSC | Storm Restoration Cost Recovery | Duke Energy Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated storm costs, capital and operation maintenance |  |  |  |  | 510 |  |  |  |  |  |  |  |  |  |  |  |
FPSC | Federal Tax Act Impacts | Duke Energy Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of tax act annual tax savings requested rate decrease |  |  | $ 4 |  | 134 |  |  |  |  |  |  |  |  |  |  |  |
Amount of tax act excess deferred tax amortization requested rate decrease |  |  | 71 |  | 67 |  |  |  |  |  |  |  |  |  |  |  |
FPSC | Federal Tax Act Impacts Revenue Requirement | Duke Energy Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  | 201 |  |  |  |  |  |  |  |  |  |  |  |
Crystal River Units 3 and 4 | FPSC | Federal Tax Act Impacts Revenue Requirement | Duke Energy Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining net book value |  |  |  |  | 50 |  |  |  |  |  |  |  |  |  |  |  |
Citrus County Combined Cycle Facility | Duke Energy Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plant capacity | MW |  |  |  |  |  |  |  |  | 1,640 |  |  |  |  |  |  |  |
Estimated capital cost including Afudc |  |  |  |  |  |  | 1,500 |  | $ 1,600 | 1,500 | 1,600 |  |  |  |  |  | $ 1,500
Impairment charges |  |  |  |  |  |  |  |  | 60 |  |  |  |  |  |  |  |
Reduction of prior year impairment |  |  |  |  |  |  |  |  |  | 36 |  |  |  |  |  |  |
Hamilton Project | FPSC | Second Revised And Restated Stipulation And Settlement Agreement 2017 | Duke Energy Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved rate increase (decrease) amount by state commission |  |  |  |  |  | $ (15) |  |  |  |  |  |  |  |  |  |  |
Columbia Project | FPSC | Second Revised And Restated Stipulation And Settlement Agreement 2017 | Duke Energy Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  | $ (14) |  |  |  |  |  |  |  |  |  |  |  |  |
Trenton Generation Project | FPSC | Second Revised And Restated Stipulation And Settlement Agreement 2017 | Duke Energy Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  | $ 13 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lake Placid Generation Project | FPSC | Second Revised And Restated Stipulation And Settlement Agreement 2017 | Duke Energy Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  | 8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
DeBary Solar Project | FPSC | Second Revised And Restated Stipulation And Settlement Agreement 2017 | Duke Energy Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  | $ 11 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Storm cost deferrals |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  | 1,399 |  | 1,117 | 1,399 | 1,117 |  |  |  |  |  |
Storm cost deferrals | Duke Energy Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  | 413 |  | 382 | 413 | 382 |  |  |  |  |  |
Storm cost deferrals | Storm Restoration Cost Recovery | Duke Energy Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  | 43 |  | 217 | 43 | 217 |  |  |  |  |  |
Storm cost deferrals | Hurricane Michael Storm Damage | Duke Energy Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  | $ 204 |  | $ 165 | $ 204 | $ 165 |  |  |  |  |  |
Storm cost deferrals | FPSC | Federal Tax Act Impacts Revenue Requirement | Duke Energy Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  | $ 155 |  | $ 151 |  |  |  |  |  |  |  |  |  |  |  |

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