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Regulatory Matters (Duke Energy Ohio Narrative) (Details) $ in Millions |  |  |  |  | 3 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 28, 2021 USD ($) | Oct. 08, 2021 USD ($) | Oct. 01, 2021 USD ($) | Jun. 01, 2021 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) site | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jul. 23, 2020 USD ($) | Jan. 01, 2020 plant | Nov. 21, 2019 condition | Jul. 12, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 28, 2018 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  | $ 14,637 | $ 14,637 | $ 14,062 |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  | 356 | 984 | $ (8) |  |  |  |  |  |
Public utilities, property, plant and equipment, net |  |  |  |  | 111,408 | 111,408 | 106,782 |  |  |  |  |  |  |
Duke Energy Ohio |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of nuclear generating facilities eligible for funding | plant |  |  |  |  |  |  |  |  |  | 2 |  |  |  |
Regulatory assets |  |  |  |  | 707 | 707 | 649 |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  | 25 |  |  |  |  |  |  |  |
Public utilities, property, plant and equipment, net |  |  |  |  | 8,625 | $ 8,625 | 8,009 |  |  |  |  |  |  |
Duke Energy Ohio Electric Base Rate Case | Public Utilities Commission Of Ohio | Duke Energy 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% |  |  |  |  |  |  |  |  |  |  |
MGP Cost Recovery - 2009 Through 2012 | Public Utilities Commission Of Ohio | Duke Energy Ohio |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of environmental remediation sites | site |  |  |  |  |  | 2 |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  | 55 | $ 55 |  |  |  |  |  |  |  |
MGP Cost Recovery - 2013 Through 2017 | Public Utilities Commission Of Ohio | Duke Energy Ohio |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 26
MGP Cost Recovery - 2018 | Public Utilities Commission Of Ohio | Duke Energy Ohio |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  |  |  | $ 20 |
MGP Cost Recovery - 2019 | Public Utilities Commission Of Ohio | Duke Energy Ohio |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  | $ 39 |  |  |  |  |  |
Duke Energy Kentucky Gas Base Rate Case | KPSC | Duke Energy Kentucky |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  | $ 9 |  | $ 15 |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), percent |  |  |  | 13.00% |  |  |  |  |  |  |  |  |  |
Annual rate increase cap, percentage |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |
Base rate case-stay out period |  | 4 years |  |  |  |  |  |  |  |  |  |  |  |
Approved rate increase (decrease) amount by state commission | $ 9 |  |  |  |  |  |  |  |  |  |  |  |  |
Duke Energy Kentucky Gas Base Rate Case | KPSC | Duke Energy Kentucky | Public Utilities, Natural Gas Base Rates |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), percent |  | 9.375% |  |  |  |  |  |  |  |  |  |  |  |
Duke Energy Kentucky Gas Base Rate Case | KPSC | Duke Energy Kentucky | Public Utilities, Natural Gas Riders |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), percent |  | 9.30% |  |  |  |  |  |  |  |  |  |  |  |
Midwest Propane Caverns | Duke Energy Ohio |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  | 19 |  |  |  |  |  |  |  |  |
Public utilities, property, plant and equipment, net |  |  |  |  | 6 | 6 | $ 27 |  |  |  |  |  |  |
Minimum | Natural Gas Pipeline Extension | Ohio Power Siting Board | Duke Energy Ohio |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated capital cost excluding AFUDC |  |  |  |  | 185 | 185 |  |  |  |  |  |  |  |
Number of conditions on construction | condition |  |  |  |  |  |  |  |  |  |  | 41 |  |  |
Maximum | Natural Gas Pipeline Extension | Ohio Power Siting Board | Duke Energy Ohio |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated capital cost excluding AFUDC |  |  |  |  | $ 195 | $ 195 |  |  |  |  |  |  |  |
MGP Costs - Regulatory Disallowance | MGP Cost Recovery - 2013 Through 2017 | Public Utilities Commission Of Ohio | Duke Energy Ohio |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12
MGP Costs - Regulatory Disallowance | MGP Cost Recovery - 2018 | Public Utilities Commission Of Ohio | Duke Energy Ohio |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  |  | $ 11 |  |
MGP Costs - Regulatory Disallowance | MGP Cost Recovery - 2019 | Public Utilities Commission Of Ohio | Duke Energy Ohio |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  | $ 4 |  |  |  |  |

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