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Regulatory Matters (Duke Energy Ohio Narrative) (Details) $ in Millions |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2020 USD ($) | Sep. 03, 2019 USD ($) MW | Jan. 30, 2019 USD ($) | Aug. 31, 2018 USD ($) | Apr. 13, 2018 USD ($) | Apr. 01, 2018 USD ($) | Sep. 27, 2017 USD ($) | Sep. 26, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jul. 12, 2019 USD ($) | Sep. 28, 2018 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulated electric |  |  |  |  |  |  |  |  |  |  | $ 22,615 | $ 22,097 | $ 21,177 |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  | 15,018 | 15,622 |  |  |
Duke Energy Ohio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulated electric |  |  |  |  |  |  |  |  |  |  | 1,456 | 1,450 | 1,373 |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  | 598 | 564 |  |  |
Electric Base Rate Case | Public Utilities Commission Of Ohio | Duke Energy Ohio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  |  |  |  | $ 15 |  |  |  |  |  |
Requested return on equity, percentage |  |  |  |  |  |  |  |  | 10.40% |  |  |  |  |  |
Requested rate increase (decrease), amended, amount |  |  |  |  | $ (19) |  |  |  |  |  |  |  |  |  |
Requested capital structure, percentage |  |  |  |  | 50.75% |  |  |  |  |  |  |  |  |  |
Approved return on equity, percentage |  |  |  |  | 9.84% |  |  |  |  |  |  |  |  |  |
Requested debt structure, percentage |  |  |  |  | 49.25% |  |  |  |  |  |  |  |  |  |
Approved rate increase (decrease) amount by state commission |  |  |  |  |  | $ (20) |  |  |  |  |  |  |  |  |
Energy Efficiency Cost Recovery Program | Public Utilities Commission Of Ohio | Duke Energy Ohio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved rate increase (decrease) amount by state commission |  |  |  |  |  |  |  |  |  |  |  |  | $ 56 |  |
Regulated electric |  |  |  |  |  |  |  |  |  | $ 20 |  |  |  |  |
MGP Cost Recovery - 2009 Through 2012 | Public Utilities Commission Of Ohio | Duke Energy Ohio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  | 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 |  |  |
Duke Energy Kentucky Gas Base Rate Case | KPSC | Duke Energy Kentucky |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  | $ 11 |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amended, amount |  |  |  | $ (5) |  |  |  |  |  |  |  |  |  |  |
Approved return on equity, percentage |  |  | 9.70% |  |  |  |  |  |  |  |  |  |  |  |
Approved rate increase (decrease) amount by state commission |  |  | $ 7 |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), percent |  |  |  | 11.10% |  |  |  |  |  |  |  |  |  |  |
Duke Energy Kentucky Electric Base Rate Case | KPSC | Duke Energy Kentucky |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  | $ 46 |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), percent |  | 12.50% |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution battery energy storage system (in MW) | MW |  | 3.4 |  |  |  |  |  |  |  |  |  |  |  |  |
Duke Energy Kentucky Electric Base Rate Case, Kentucky Attorney General | KPSC | Duke Energy Kentucky |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  | $ 26 |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum | Electric Base Rate Case | Public Utilities Commission Of Ohio | Duke Energy Ohio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  |  |  | $ (18) |  |  |  |  |  |  |
Requested return on equity, percentage |  |  |  |  |  |  |  | 9.22% |  |  |  |  |  |  |
Minimum | Natural Gas Pipeline Extension | Ohio Power Siting Board | Duke Energy Ohio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated capital cost excluding AFUDC |  |  |  |  |  |  |  |  |  |  | 163 |  |  |  |
Maximum | Electric Base Rate Case | Public Utilities Commission Of Ohio | Duke Energy Ohio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  |  |  | $ (29) |  |  |  |  |  |  |
Requested return on equity, percentage |  |  |  |  |  |  |  | 10.24% |  |  |  |  |  |  |
Requested rider revenue increase |  |  |  |  | $ 10 |  |  |  |  |  |  |  |  |  |
Maximum | Energy Efficiency Cost Recovery Program | Public Utilities Commission Of Ohio | Duke Energy Ohio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved rate increase (decrease) amount by state commission |  |  |  |  |  |  | $ 38 |  |  |  |  |  |  |  |
Maximum | Natural Gas Pipeline Extension | Ohio Power Siting Board | Duke Energy Ohio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated capital cost excluding AFUDC |  |  |  |  |  |  |  |  |  |  | 245 |  |  |  |
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 |
RTO Realignment | Duke Energy Ohio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  | $ 40 | $ 43 |  |  |
Subsequent Event | Duke Energy Kentucky Electric Base Rate Case | KPSC | Duke Energy Kentucky |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) | $ 44 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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