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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Indiana) (Details) - IURC - Duke Energy Indiana $ in Millions | Feb. 13, 2025 USD ($) MW | Feb. 07, 2025 USD ($) | Feb. 03, 2025 USD ($) | Apr. 30, 2024 USD ($) | Sep. 20, 2023 | Jun. 15, 2022 USD ($)
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Indiana Coal Ash Recovery |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Interest rate on refunds (as a percent) |  |  |  |  | 4.71% |
TDSIG 2.0 |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Future investment in infrastructure |  |  |  |  |  | $ 2,000
2024 Indiana Rate Case |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Future investment in infrastructure |  |  |  | $ 1,600 |  |
Approved return on equity percentage (as a percent) |  |  | 9.75% |  |  |
Equity ratio (as a percent) |  |  | 53.00% |  |  |
Approved rate increase (decrease), amount |  | $ 385 | $ 296 |  |  |
Cayuga Combined Cycle CPCN, Gas-Fired |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
New combustion turbines (in megawatts) | MW | 1,476 |  |  |  |  |
Cayuga Combined Cycle CPCN, Coal-Fired |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
New combustion turbines (in megawatts) | MW | 1,005 |  |  |  |  |
Cayuga Combined Cycle CPCN |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
New combustion turbines (in megawatts) | MW | 471 |  |  |  |  |
Estimated cost of facilities | $ 3,300 |  |  |  |  |
Requested rate increase, percentage, net of tax | 5.40% |  |  |  |  |

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