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Regulatory Matters (Duke Energy Narrative) (Details) customer in Thousands, $ in Millions |  |  |  |  |  | 1 Months Ended | 12 Months Ended | 24 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 03, 2026 USD ($) | Oct. 02, 2025 USD ($) | Mar. 31, 2025 | Dec. 02, 2024 USD ($) | Oct. 12, 2023 USD ($) | Jan. 31, 2026 USD ($) customer | Dec. 31, 2025 USD ($) | Dec. 31, 2025 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2025 USD ($) | Feb. 24, 2026 USD ($) MW
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  | $ 14,002 | $ 12,263 | $ 12,622 |  |
Operation, maintenance and other |  |  |  |  |  |  |  | 6,698 | 5,389 | 5,625 |  |
Regulatory assets |  |  |  |  |  |  | $ 16,313 | 16,313 | 16,959 |  | $ 16,313 |
Other Noncurrent Assets: Regulatory assets |  |  |  |  |  |  | $ 14,379 | $ 14,379 | 14,220 |  | $ 14,379 |
Nuclear Regulatory Commission |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating license extension (in years) |  |  |  |  |  |  |  | 20 years |  |  |  |
Duke Energy Ohio |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Limit of total capital (as a percent) |  |  |  |  |  |  | 30.00% | 30.00% |  |  | 30.00% |
Capital expenditures |  |  |  |  |  |  |  | $ 929 | 815 | 939 |  |
Operation, maintenance and other |  |  |  |  |  |  |  | 490 | 485 | 478 |  |
Regulatory assets |  |  |  |  |  |  | $ 772 | 772 | 793 |  | $ 772 |
Other Noncurrent Assets: Regulatory assets |  |  |  |  |  |  | $ 686 | $ 686 | 705 |  | $ 686 |
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 | KPSC |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Approved rate increase (decrease) amount by state commission |  |  |  |  | $ 48 |  |  |  |  |  |  |
Duke Energy Ohio | Maximum | Duke Energy Kentucky Electric Base Rate Case | KPSC |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity ratio (as a percent) |  |  |  |  | 52.145% |  |  |  |  |  |  |
Duke Energy Kentucky |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Required minimum equity capital structure (as a percent) |  |  |  |  |  |  | 35.00% | 35.00% |  |  | 35.00% |
Duke Energy Kentucky | Duke Energy Kentucky 2024 Electric Base Rate Case | KPSC |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  | $ 70 |  |  |  |  |  |  |  |
Duke Energy Kentucky | Duke Energy Kentucky 2025 Natural Gas Base Rate Case | Kentucky Public Service Commission (KPSC) |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Approved rate increase (decrease) amount by state commission |  | $ 44 |  |  |  |  |  |  |  |  |  |
Duke Energy Kentucky | Duke Energy Kentucky 2025 Natural Gas Base Rate Case | Kentucky Public Service Commission (KPSC) | Subsequent Event | Forecast |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Approved rate increase (decrease) amount by state commission | $ 22 |  |  |  |  |  |  |  |  |  |  |
Approved return on equity (as a percent) | 9.80% |  |  |  |  |  |  |  |  |  |  |
Equity ratio (as a percent) | 52.649% |  |  |  |  |  |  |  |  |  |  |
Duke Energy Kentucky | Duke Energy Kentucky Electric Base Rate Case, Electric Base Rates | Kentucky Public Service Commission (KPSC) |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity (as a percent) |  | 9.80% |  |  |  |  |  |  |  |  |  |
Duke Energy Kentucky | Duke Energy Kentucky Electric Base Rate Case | Kentucky Public Service Commission (KPSC) |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity ratio (as a percent) |  | 52.73% |  |  |  |  |  |  |  |  |  |
Refund made to customers |  |  |  |  |  |  | $ 7 |  |  |  |  |
Duke Energy Carolinas and Duke Energy Progress | Applications To Combine Utilities | NCUC | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Guaranteed savings under the regulatory agreement (at least) |  |  |  |  |  |  |  |  |  |  |  | $ 286
Period of guaranteed savings under the regulatory agreement |  |  |  |  |  |  |  |  |  |  |  | 14 years
Battery storage capacity removed from portfolio (in MW) | MW |  |  |  |  |  |  |  |  |  |  |  | 200
Share the benefits contributions to be provided |  |  |  |  |  |  |  |  |  |  |  | $ 25
Period of share the benefits contributions to be provided |  |  |  |  |  |  |  |  |  |  |  | 6 years
Duke Energy Carolinas and Duke Energy Progress | Winter Storm Fern | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of customers impacted | customer |  |  |  |  |  | 200 |  |  |  |  |  |
Duke Energy Carolinas and Duke Energy Progress | Winter Storm Fern | Minimum | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated storm restoration costs |  |  |  |  |  | $ 250 |  |  |  |  |  |
Duke Energy Carolinas and Duke Energy Progress | Winter Storm Fern | Maximum | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated storm restoration costs |  |  |  |  |  | 350 |  |  |  |  |  |
Duke Energy Carolinas and Duke Energy Progress | Hurricanes Helene, Debby and Milton |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  | $ 507 |  |  |  |
Estimated storm restoration costs |  |  |  |  |  |  |  |  |  |  | $ 762 |
Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  | 4,477 | 3,966 | 3,733 |  |
Operation, maintenance and other |  |  |  |  |  |  |  | 2,002 | 1,740 | 1,774 |  |
Regulatory assets |  |  |  |  |  |  | 5,232 | 5,232 | 4,884 |  | 5,232 |
Other Noncurrent Assets: Regulatory assets |  |  |  |  |  |  | 4,502 | 4,502 | 4,199 |  | 4,502 |
Duke Energy Carolinas | Oconee Nuclear Station Subsequent License Renewal | Nuclear Regulatory Commission | Oconee |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating license (in years) |  |  | 20 years |  |  |  |  |  |  |  |  |
Duke Energy Carolinas | Winter Storm Fern | Minimum | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated storm restoration costs |  |  |  |  |  | 150 |  |  |  |  |  |
Duke Energy Carolinas | Winter Storm Fern | Maximum | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated storm restoration costs |  |  |  |  |  | 225 |  |  |  |  |  |
Duke Energy Carolinas | Hurricanes Helene, Debby and Milton |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  | 408 |  |  |  |
Estimated storm restoration costs |  |  |  |  |  |  |  |  |  |  | 474 |
Duke Energy Carolinas | Natural Disasters and Other Casualty Events | Hurricanes Helene, Debby and Milton | NCUC |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Storm reserves |  |  |  |  |  |  | 200 | 200 |  |  | 200 |
Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  | 3,428 | 2,803 | 2,387 |  |
Operation, maintenance and other |  |  |  |  |  |  |  | 1,455 | 1,388 | $ 1,379 |  |
Regulatory assets |  |  |  |  |  |  | 5,195 | 5,195 | 5,181 |  | 5,195 |
Other Noncurrent Assets: Regulatory assets |  |  |  |  |  |  | 4,543 | 4,543 | $ 4,555 |  | 4,543 |
Duke Energy Progress | Winter Storm Fern | Minimum | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated storm restoration costs |  |  |  |  |  | 100 |  |  |  |  |  |
Duke Energy Progress | Winter Storm Fern | Maximum | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated storm restoration costs |  |  |  |  |  | $ 125 |  |  |  |  |  |
Duke Energy Progress | Hurricanes Helene, Debby and Milton |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  | 99 |  |  |  |
Estimated storm restoration costs |  |  |  |  |  |  |  |  |  |  | 288 |
Duke Energy Progress | Natural Disasters and Other Casualty Events | Hurricanes Helene, Debby and Milton | NCUC |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Storm reserves |  |  |  |  |  |  | $ 100 | $ 100 |  |  | $ 100 |

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