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Regulatory Matters (Duke Energy Ohio Narrative) (Details) $ in Millions |  |  |  |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 01, 2022 USD ($) | Sep. 19, 2022 USD ($) | Jul. 14, 2022 USD ($) | May 19, 2022 USD ($) | Oct. 01, 2021 USD ($) | Dec. 31, 2022 USD ($) | Sep. 30, 2022 USD ($) | Jun. 30, 2022 USD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2022 USD ($) site | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Apr. 27, 2022 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  | $ 7,351 | $ 7,842 | $ 6,564 | $ 7,011 | $ 6,117 | $ 6,834 | $ 5,638 | $ 6,032 | $ 28,768 | $ 24,621 | $ 23,366 |
Operation, maintenance and other |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,734 | 5,703 | 5,502 |
Income tax expense (benefit) from continuing operations |  |  |  |  |  |  |  |  |  |  |  |  |  | 300 | 268 | (169) |
Public utilities, property, plant and equipment, net |  |  |  |  |  | 111,748 |  |  |  | 105,536 |  |  |  | 111,748 | 105,536 |  |
Asset impairment charges |  |  |  |  |  |  |  |  |  |  |  |  |  | 434 | 353 | 978 |
Duke Energy Ohio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,514 | 2,037 | 1,858 |
Operation, maintenance and other |  |  |  |  |  |  |  |  |  |  |  |  |  | 523 | 479 | 463 |
Income tax expense (benefit) from continuing operations |  |  |  |  |  |  |  |  |  |  |  |  |  | (21) | 30 | $ 43 |
Impairment (reversal) of assets and other charges |  |  |  |  |  |  |  |  |  |  |  |  |  | (10) | 25 |  |
Public utilities, property, plant and equipment, net |  |  |  |  |  | 9,247 |  |  |  | $ 8,625 |  |  |  | 9,247 | 8,625 |  |
Asset impairment charges |  |  |  |  |  |  |  |  |  |  |  |  |  | (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 |  |  |  |  |  |  |  |  |  |  |  |
Requested return on equity, percentage |  |  |  |  | 10.30% |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), percent |  |  |  |  | 3.30% |  |  |  |  |  |  |  |  |  |  |  |
Approved rate increase (decrease) amount by state commission |  | $ 23 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity, percentage |  | 9.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Duke Energy Ohio | Duke Energy Ohio Electric Base Rate Case | Public Utilities Commission Of Ohio | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  | $ 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Requested return on equity, percentage |  |  |  | 8.84% |  |  |  |  |  |  |  |  |  |  |  |  |
Duke Energy Ohio | Duke Energy Ohio Electric Base Rate Case | Public Utilities Commission Of Ohio | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  | $ 15 |  |  |  |  |  |  |  |  |  |  |  |  |
Requested return on equity, percentage |  |  |  | 9.85% |  |  |  |  |  |  |  |  |  |  |  |  |
Duke Energy Ohio | Natural Gas Pipeline Extension | Ohio Power Siting Board | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated capital cost excluding AFUDC |  |  |  |  |  | $ 170 |  |  |  |  |  |  |  | $ 170 |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15 |  |  |
Operation, maintenance and other |  |  |  |  |  |  |  |  |  |  |  |  |  | 58 |  |  |
Income tax expense (benefit) from continuing operations |  |  |  |  |  |  |  |  |  |  |  |  |  | (72) |  |  |
Duke Energy Ohio | Propane caverns |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment (reversal) of assets and other charges |  |  |  |  |  |  |  |  |  |  |  |  |  | (12) |  |  |
Public utilities, property, plant and equipment, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7
Asset impairment charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 19 |  |
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) |  |  | $ 49 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested return on equity, percentage |  |  | 10.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), percent |  |  | 5.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Duke Energy Ohio | Duke Energy Ohio Gas Base Rate Case | Public Utilities Commission Of Ohio | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 24 |  |  |
Requested return on equity, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.03% |  |  |
Duke Energy Ohio | Duke Energy Ohio Gas Base Rate Case | Public Utilities Commission Of Ohio | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 36 |  |  |
Requested return on equity, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.04% |  |  |
Equity ratio (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 52.00% |  |  |
Duke Energy Ohio | Duke Energy Kentucky Electric Base Rate Case | KPSC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) | $ 75 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested return on equity, percentage | 10.35% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), percent |  |  |  |  |  |  |  |  |  |  |  |  |  | 17.80% |  |  |

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