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Regulatory Matters (Duke Energy Indiana Narrative) (Details) |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |
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Feb. 13, 2025 USD ($) MW | Jan. 29, 2025 USD ($) | Apr. 04, 2024 USD ($) | Jun. 29, 2020 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2026 | Dec. 31, 2025 | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Sep. 20, 2023 | Jun. 30, 2023 USD ($) | Feb. 03, 2023 USD ($) | Jun. 15, 2022 USD ($) | Dec. 31, 2021 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  | $ 38,000,000 | $ 85,000,000 | $ 434,000,000 |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  | 30,357,000,000 | 29,060,000,000 | 28,768,000,000 |  |  |  |  |
Duke Energy Indiana |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  | 0 | 0 | 388,000,000 |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  | $ 3,040,000,000 | 3,399,000,000 | $ 3,922,000,000 |  |  |  |  |
Duke Energy Indiana | Indiana Rate Case 2019 | Indiana Utility Regulatory Commission |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved rate increase (decrease) amount by state commission |  |  |  | $ 146,000,000 |  |  |  |  |  |  |  |  |  |  |
Disclosure of rate matters, rate base |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,200,000,000
Public utilities, disclosure of rate matters, reduction of rate base |  |  |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |
Public utilities, approved return on equity, step one estimated percentage (as a percent) |  |  |  | 75.00% |  |  |  |  |  |  |  |  |  |  |
Public utilities, approved return on equity, step two estimated (as a percent) |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  | 211,000,000 |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | 46,000,000 |  |  |  |  |  |
Refunds to customers |  |  |  |  |  |  |  |  |  |  |  | $ 70,000,000 | $ 70,000,000 |  |
Duke Energy Indiana | Indiana Coal Ash Recovery | Indiana Utility Regulatory Commission |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  | $ 175,000,000 |  |  |  |  |  |
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) |  |  | $ 492,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), net of tax (as a percent) |  |  | 16.20% |  |  |  |  |  |  |  |  |  |  |  |
Requested return on equity (as a percent) |  |  | 10.50% |  |  |  |  |  |  |  |  |  |  |  |
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 | 2024 Indiana Rate Case | Indiana Utility Regulatory Commission | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |  |  |  |  |
Equity ratio (as a percent) |  | 53.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Duke Energy Indiana | 2024 Indiana Rate Case | Indiana Utility Regulatory Commission | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), net of tax (as a percent) |  |  |  |  |  | 4.50% | 11.70% |  |  |  |  |  |  |  |
Duke Energy Indiana | Cayuga Combined Cycle CPCN | Indiana Utility Regulatory Commission | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), net of tax (as a percent) | 5.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Winter rating, combustion turbines | MW | 471 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated cost of generation facilities to be built | $ 2,970,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Duke Energy Indiana | Cayuga Combined Cycle CPCN, Gas-Fired | Indiana Utility Regulatory Commission | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Winter rating, combustion turbines | MW | 1,005 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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