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Regulatory Matters (Duke Energy Ohio Narrative) (Details) - USD ($) $ in Millions |  |  |  |  |  |  | 1 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 16, 2020 | Apr. 27, 2020 | Jan. 31, 2020 | Sep. 03, 2019 | Apr. 13, 2018 | Apr. 01, 2018 | Mar. 31, 2017 | Dec. 31, 2020 | Jul. 23, 2020 | Dec. 31, 2019 | Jul. 12, 2019 | Dec. 31, 2018 | Sep. 28, 2018
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  | $ 14,062 |  | $ 15,018 |  |  |
Duke Energy Ohio |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  | 649 |  | 598 |  |  |
Duke Energy Ohio | RTO Realignment |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  | 37 |  | 40 |  |  |
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) |  |  |  |  |  |  |  |
Approved return on equity, percentage |  |  |  |  | 9.84% |  |  |  |  |  |  |  |
Requested capital structure, percentage |  |  |  |  | 50.75% |  |  |  |  |  |  |  |
Requested debt structure, percentage |  |  |  |  | 49.25% |  |  |  |  |  |  |  |
Approved rate increase (decrease) amount by state commission |  |  |  |  |  | $ (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 |
MGP Cost Recovery - 2019 | Public Utilities Commission Of Ohio | Duke Energy Ohio |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  | $ 39 |  |  |
Duke Energy Kentucky Electric Base Rate Case | KPSC | Duke Energy Kentucky |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  | $ 44 | $ 46 |  |  |  |  |  |  |  |  |
Approved return on equity, percentage |  | 9.25% |  |  |  |  |  |  |  |  |  |  |
Approved rate increase (decrease) amount by state commission | $ 28 | $ 24 |  |  |  |  |  |  |  |  |  |  |
Additional approved rate increase (decrease), amount | $ 4 |  |  |  |  |  |  |  |  |  |  |  |
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 rider revenue increase |  |  |  |  | $ 10 |  |  |  |  |  |  |  |
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 |  |
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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