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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Ohio) (Details) $ in Millions |  |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
May 19, 2022 USD ($) | Oct. 01, 2021 USD ($) | Jun. 30, 2022 USD ($) | Mar. 31, 2022 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) site | Jun. 30, 2021 USD ($) | Apr. 27, 2022 USD ($) | Dec. 31, 2021 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Operating Revenues |  |  | $ 6,685 |  | $ 5,758 | $ 13,817 | $ 11,908 |  |
Incurred costs |  |  | 1,447 |  | 1,410 | 3,077 | 2,812 |  |
Income Tax Expense |  |  | 77 |  | 36 | 63 | 120 |  |
Impairment of assets and other charges |  |  | (9) |  | 131 | 206 | 131 |  |
Net property, plant and equipment |  |  | 113,851 |  |  | 113,851 |  |  | $ 111,408
Duke Energy Ohio |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Operating Revenues |  |  | 545 |  | 456 | 1,183 | 988 |  |
Incurred costs |  |  | 109 |  | 111 | 287 | 219 |  |
Income Tax Expense |  |  | 9 |  | 11 | (47) | 25 |  |
Impairment of assets and other charges |  |  |  |  | $ 5 |  | $ 5 |  |
Net property, plant and equipment |  |  | 8,866 |  |  | 8,866 |  |  | $ 8,625
Duke Energy Ohio | Duke Energy Ohio Electric Base Rate Case | PUCO |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  | $ 55 |  |  |  |  |  |  |
Requested return on equity, percent |  | 10.30% |  |  |  |  |  |  |
Requested rate increase, percentage |  | 3.30% |  |  |  |  |  |  |
Duke Energy Ohio | Duke Energy Ohio Electric Base Rate Case | PUCO | Minimum |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount | $ 2 |  |  |  |  |  |  |  |
Requested return on equity, percent | 8.84% |  |  |  |  |  |  |  |
Duke Energy Ohio | Duke Energy Ohio Electric Base Rate Case | PUCO | Maximum |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount | $ 15 |  |  |  |  |  |  |  |
Requested return on equity, percent | 9.85% |  |  |  |  |  |  |  |
Duke Energy Ohio | Natural Gas Pipeline extension | OPSB |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Estimated capital cost excluding AFUDC |  |  | $ 185 |  |  | $ 185 |  |  |
Duke Energy Ohio | MGP Cost Recovery - 2009 Through 2012 | PUCO |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Number of environmental remediation sites | site |  |  |  |  |  | 2 |  |  |
Duke Energy Ohio | MGP Cost Recovery - 2013 Through 2019 | PUCO |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  | $ 15 |  |  |
Incurred costs |  |  |  |  |  | 58 |  |  |
Income Tax Expense |  |  |  |  |  | (72) |  |  |
Duke Energy Ohio | Midwest Propane Caverns |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  | $ 19 |  |  |  |  |
Net property, plant and equipment |  |  |  |  |  |  |  | $ 7 |
Duke Energy Ohio | Duke Energy Ohio Gas Base Rate Case | PUCO |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  | $ 49 |  |  |
Requested return on equity, percent |  |  |  |  |  | 10.30% |  |  |
Requested rate increase, percentage |  |  |  |  |  | 5.60% |  |  |

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