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Regulatory Matters (Duke Energy Ohio Narrative) (Details) $ in Millions |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 12, 2023 USD ($) | Apr. 28, 2023 USD ($) | Dec. 01, 2022 USD ($) | Sep. 19, 2022 USD ($) | Jul. 14, 2022 USD ($) | Oct. 01, 2021 USD ($) | Dec. 31, 2023 USD ($) | Sep. 30, 2023 USD ($) | Jun. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Sep. 30, 2022 USD ($) | Jun. 30, 2022 USD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) site | Dec. 31, 2021 USD ($) | Apr. 27, 2022 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  | $ 7,212 | $ 7,994 | $ 6,578 | $ 7,276 | $ 7,351 | $ 7,842 | $ 6,564 | $ 7,011 | $ 29,060 | $ 28,768 | $ 24,621 |
Operation, maintenance and other |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,625 | 5,734 | 5,703 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (438) | (300) | (268) |
Public utilities, property, plant and equipment, net |  |  |  |  |  |  | 115,315 |  |  |  | 111,748 |  |  |  | 115,315 | 111,748 |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (85) | (434) | (353) |
Duke Energy Ohio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,507 | 2,514 | 2,037 |
Operation, maintenance and other |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 478 | 523 | 479 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (63) | 21 | (30) |
Public utilities, property, plant and equipment, net |  |  |  |  |  |  | $ 9,759 |  |  |  | $ 9,247 |  |  |  | 9,759 | 9,247 |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3) | $ 10 | (25) |
Duke Energy Ohio | Duke Energy Ohio Electric Base Rate Case | Public Utilities Commission Of Ohio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  | $ 55 |  |  |  |  |  |  |  |  |  |  |  |
Approved rate increase (decrease) amount by state commission |  |  |  | $ 23 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity (as a percent) |  |  |  | 9.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Duke Energy Ohio | Energy Efficiency Cost Recovery | Public Utilities Commission Of Ohio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulated electric revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14 |  |  |
Duke Energy Ohio | Duke Energy Ohio Gas Base Rate Case | Public Utilities Commission Of Ohio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  | $ 32 |  |  | $ 49 |  |  |  |  |  |  |  |  |  |  |  |  |
Requested return on equity (as a percent) |  | 9.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Duke Energy Ohio | Duke Energy Ohio Gas Base Rate Case | Public Utilities Commission Of Ohio | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity ratio (as a percent) |  | 52.32% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Duke Energy Ohio | MGP Cost Recovery - 2009 Through 2012 | Public Utilities Commission Of Ohio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of environmental remediation sites | site |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |
Duke Energy Ohio | MGP Cost Recovery - 2013 Through 2019 | Public Utilities Commission Of Ohio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15 |  |
Operation, maintenance and other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 58 |  |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 72 |  |
Duke Energy Ohio | Midwest Propane Caverns [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 19 |
Public utilities, property, plant and equipment, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12 |  |
Duke Energy Ohio | Duke Energy Kentucky Electric Base Rate Case | KPSC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  | $ 75 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved rate increase (decrease) amount by state commission | $ 48 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Duke Energy Ohio | Duke Energy Kentucky Electric Base Rate Case | KPSC | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity ratio (as a percent) | 52.145% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Duke Energy Ohio | Duke Energy Kentucky Electric Base Rate Case, Electric Base Rates | KPSC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity (as a percent) | 9.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Duke Energy Ohio | Duke Energy Kentucky Electric Base Rate Case, Electric Riders | KPSC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity (as a percent) | 9.65% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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