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Regulatory Matters (Duke Energy Indiana Narrative) (Details) |  |  |  | 1 Months Ended | 12 Months Ended |  |  |
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Nov. 25, 2025 | Feb. 13, 2025 USD ($) MW | Jan. 29, 2025 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2025 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Apr. 04, 2024 USD ($) | Sep. 20, 2023 | Jun. 15, 2022 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  | $ (4,000,000) | $ 38,000,000 | $ 85,000,000 |  |  |
Operating Revenues |  |  |  |  | 32,237,000,000 | 30,357,000,000 | 29,060,000,000 |  |  |
Duke Energy Indiana |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  | 0 |  |  |
Operating Revenues |  |  |  |  | $ 3,544,000,000 | $ 3,040,000,000 | $ 3,399,000,000 |  |  |
Duke Energy Indiana | Indiana Coal Ash Recovery | Indiana Utility Regulatory Commission |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Simple interest of refunds (as a percent) |  |  |  |  |  |  |  |  | 4.71% |
Duke Energy Indiana | TDSIG 2.0 | Indiana Utility Regulatory Commission |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Future investments in new cost |  |  |  |  |  |  |  |  |  | $ 2,000,000,000
Duke Energy Indiana | 2024 Indiana Rate Case | Indiana Utility Regulatory Commission |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amended, amount |  |  | $ 385,000,000 |  |  |  |  |  |  |
Approved rate increase (decrease) amount by state commission |  |  | $ 296,000,000 |  |  |  |  |  |  |
Approved return on equity (as a percent) |  |  | 9.75% |  |  |  |  |  |  |
Future investments in new cost |  |  |  |  |  |  |  | $ 1,600,000,000 |  |
Equity ratio (as a percent) |  |  | 53.00% |  |  |  |  |  |  |
Accumulated other comprehensive loss (income) |  |  |  | $ 29,000,000 |  |  |  |  |  |
Duke Energy Indiana | Cayuga Combined Cycle CPCN | Indiana Utility Regulatory Commission |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), net of tax (as a percent) | 5.60% |  |  |  |  |  |  |  |  |
Winter rating, combustion turbines | MW |  | 471 |  |  |  |  |  |  |  |
Estimated cost of generation facilities to be built |  | $ 3,300,000,000 |  |  |  |  |  |  |  |
Duke Energy Indiana | Cayuga Combined Cycle CPCN, Gas-Fired | Indiana Utility Regulatory Commission |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Winter rating, combustion turbines | MW |  | 1,476 |  |  |  |  |  |  |  |
Duke Energy Indiana | Cayuga Combined Cycle CPCN, Coal-Fired | Indiana Utility Regulatory Commission |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Winter rating, combustion turbines | MW |  | 1,005 |  |  |  |  |  |  |  |

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