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Regulatory Matters (Duke Energy Ohio Narrative) (Details) $ in Millions |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 02, 2024 USD ($) | Oct. 12, 2023 USD ($) | Aug. 18, 2023 | Apr. 28, 2023 USD ($) | Sep. 19, 2022 USD ($) | Dec. 31, 2024 USD ($) | Aug. 17, 2024 USD ($) | Dec. 31, 2023 USD ($) site | Dec. 31, 2022 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  | $ 30,357 |  | $ 29,060 | $ 28,768
Operation, maintenance and other |  |  |  |  |  | 5,389 |  | 5,625 | 5,734
Income tax expense (benefit) |  |  |  |  |  | (590) |  | (438) | (300)
Public utilities, property, plant and equipment, net |  |  |  |  |  | 123,303 |  | 115,315 |
Impairment of assets and other charges |  |  |  |  |  | (38) |  | (85) | (434)
Duke Energy Ohio |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  | 2,545 |  | 2,507 | 2,514
Operation, maintenance and other |  |  |  |  |  | 485 |  | 478 | 523
Income tax expense (benefit) |  |  |  |  |  | (64) |  | (63) | 21
Public utilities, property, plant and equipment, net |  |  |  |  |  | 10,244 |  | 9,759 |
Impairment of assets and other charges |  |  |  |  |  | 0 |  | $ (3) | 10
Duke Energy Ohio | Duke Energy Ohio Electric Base Rate Case | Public Utilities Commission Of Ohio |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Approved rate increase (decrease) amount by state commission |  |  |  |  | $ 23 |  |  |  |
Approved return on equity (as a percent) |  |  |  |  | 9.50% |  |  |  |
Duke Energy Ohio | Duke Energy Ohio Electric Base Rate Case | Public Utilities Commission Of Ohio | Equity |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Approved return on equity (as a percent) |  |  |  |  | 50.50% |  |  |  |
Duke Energy Ohio | Energy Efficiency Cost Recovery | Public Utilities Commission Of Ohio |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Regulated electric revenue |  |  |  |  |  | 14 |  |  |
Duke Energy Ohio | Duke Energy Ohio Gas Base Rate Case | Public Utilities Commission Of Ohio |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  | $ 32 |  |  |  |  |
Requested return on equity (as a percent) |  |  |  | 9.60% |  |  |  |  |
Duke Energy Ohio | Duke Energy Ohio Gas Base Rate Case | Public Utilities Commission Of Ohio | Maximum |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Equity ratio (as a percent) |  |  |  | 52.32% |  |  |  |  |
Duke Energy Ohio | MGP Cost Recovery - 2009 Through 2012 | Public Utilities Commission Of Ohio |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Number of environmental remediation sites | site |  |  |  |  |  |  |  | 2 |
Duke Energy Ohio | MGP Cost Recovery - 2013 Through 2019 | Public Utilities Commission Of Ohio |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  | $ 15 |
Operation, maintenance and other |  |  |  |  |  |  |  | 58 |
Income tax expense (benefit) |  |  |  |  |  |  |  | 72 |
Duke Energy Ohio | Duke Energy Kentucky Electric Base Rate Case | KPSC |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Approved rate increase (decrease) amount by state commission |  | $ 48 |  |  |  |  |  |  |
Duke Energy Ohio | Duke Energy Kentucky Electric Base Rate Case | KPSC | Maximum |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Equity ratio (as a percent) |  | 52.145% |  |  |  |  |  |  |
Duke Energy Ohio | Duke Energy Kentucky Electric Base Rate Case, Electric Base Rates | KPSC |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Approved return on equity (as a percent) |  | 9.75% |  |  |  |  |  |  |
Duke Energy Ohio | Duke Energy Kentucky Electric Base Rate Case, Electric Riders | KPSC |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Approved return on equity (as a percent) |  | 9.65% |  |  |  |  |  |  |
Duke Energy Progress |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  | 7,017 |  | 6,488 | 6,753
Operation, maintenance and other |  |  |  |  |  | 1,388 |  | 1,379 | 1,475
Income tax expense (benefit) |  |  |  |  |  | (189) |  | (149) | (158)
Public utilities, property, plant and equipment, net |  |  |  |  |  | 26,130 |  | 24,056 |
Impairment of assets and other charges |  |  |  |  |  | (6) |  | $ (29) | $ (7)
Duke Energy Progress | 2022 North Carolina Rate Case | NCUC |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Approved rate increase (decrease) amount by state commission |  |  |  |  |  |  | $ 233 |  |
Approved return on equity (as a percent) |  |  | 9.80% |  |  |  |  |  |
Operation, maintenance and other |  |  |  |  |  | 8 |  |  |
Impairment of assets and other charges |  |  |  |  |  | $ (28) |  |  |
Duke Energy Progress | 2022 North Carolina Rate Case | NCUC | Equity |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Approved return on equity (as a percent) |  |  | 53.00% |  |  |  |  |  |
Duke Energy Kentucky | Duke Energy Kentucky 2024 Electric Base Rate Case | KPSC |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) | $ 70 |  |  |  |  |  |  |  |
Requested return on equity (as a percent) | 10.85% |  |  |  |  |  |  |  |
Equity ratio (as a percent) | 52.728% |  |  |  |  |  |  |  |
Requested rate increase (decrease), net of tax (as a percent) | 14.70% |  |  |  |  |  |  |  |

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