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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Ohio) (Details) $ in Millions |  |  |  |  |  | 1 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 16, 2020 USD ($) | Apr. 27, 2020 USD ($) | Jan. 31, 2020 USD ($) | Sep. 03, 2019 USD ($) | Apr. 13, 2018 USD ($) | Mar. 31, 2017 USD ($) | Sep. 30, 2020 USD ($) site | Jul. 23, 2020 USD ($) | Mar. 31, 2020 USD ($) | Jul. 12, 2019 USD ($) | Mar. 29, 2019 USD ($) | Sep. 28, 2018 USD ($)
Duke Energy Ohio | Ohio Base Rate Case 2017 | PUCO |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  | $ 15 |  |  |  |  |  |
Requested return on equity, percent |  |  |  |  |  | 10.40% |  |  |  |  |  |
Requested rate increase (decrease), amended amount |  |  |  |  | $ (19) |  |  |  |  |  |  |
Requested rate increase (decrease) amended, percentage |  |  |  |  | 9.84% |  |  |  |  |  |  |
Public utilities, requested equity capital structure, percentage |  |  |  |  | 50.75% |  |  |  |  |  |  |
Public utilities, requested debt capital structure, percentage |  |  |  |  | 49.25% |  |  |  |  |  |  |
Approved rate increase (decrease), amount |  |  |  |  | $ (20) |  |  |  |  |  |  |
Duke Energy Ohio | Ohio Base Rate Case 2017 | PUCO | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Requested rider revenue increase |  |  |  |  | $ 10 |  |  |  |  |  |  |
Duke Energy Ohio | Natural Gas Pipeline extension | OPSB | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated capital cost excluding AFUDC |  |  |  |  |  |  | $ 163 |  |  |  |  |
Duke Energy Ohio | Natural Gas Pipeline extension | OPSB | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated capital cost excluding AFUDC |  |  |  |  |  |  | $ 245 |  |  |  |  |
Duke Energy Ohio | MGP Cost Recovery - 2009 Through 2012 | PUCO |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of environmental remediation sites | site |  |  |  |  |  |  | 2 |  |  |  |  |
Regulatory assets |  |  |  |  |  |  | $ 55 |  |  |  |  |
Duke Energy Ohio | MGP Cost Recovery - 2013 Through 2017 | PUCO |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  |  | $ 26
Duke Energy Ohio | MGP Cost Recovery - 2013 Through 2017 | PUCO | MGP Costs - regulatory disallowance |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  |  | $ 12
Duke Energy Ohio | MGP Cost Recovery - 2018 | PUCO |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  | $ 20 |
Duke Energy Ohio | MGP Cost Recovery - 2018 | PUCO | MGP Costs - regulatory disallowance |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  | $ 11 |  |
Duke Energy Ohio | MGP Cost Recovery - 2019 | PUCO |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  | $ 4 | $ 39 |  |  |
Duke Energy Kentucky | Duke Energy Kentucky Electric base rate case | KPSC |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  | $ 46 |  |  |  |  |  |  |  |
Requested rate increase (decrease), amended amount |  |  | $ 44 |  |  |  |  |  |  |  |  |
Approved rate increase (decrease), amount |  | $ 24 |  |  |  |  |  |  |  |  |  |
Approved return on equity percentage |  | 9.25% |  |  |  |  |  |  |  |  |  |
Duke Energy Kentucky | Duke Energy Kentucky Electric base rate case | KPSC | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Approved rate increase (decrease), amount | $ 28 |  |  |  |  |  |  |  |  |  |  |
Approved additional increase | $ 4 |  |  |  |  |  |  |  |  |  |  |

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