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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Indiana) (Details) $ in Millions |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 13, 2025 USD ($) MW | Feb. 07, 2025 USD ($) | Jan. 29, 2025 USD ($) | Apr. 30, 2024 USD ($) | Mar. 31, 2025 USD ($) | Mar. 31, 2024 USD ($) | Dec. 31, 2026 | Dec. 31, 2025 | Sep. 20, 2023 | Jun. 15, 2022 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  | $ 8,249 | $ 7,671 |  |  |  |
Duke Energy Indiana |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  | $ 858 | $ 759 |  |  |  |
Indiana Coal Ash Recovery | IURC | Duke Energy Indiana |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate on refunds (as a percent) |  |  |  |  |  |  |  |  | 4.71% |
TDSIG 2.0 | IURC | Duke Energy Indiana |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Future investment in infrastructure |  |  |  |  |  |  |  |  |  | $ 2,000
2024 Indiana Rate Case | IURC | Duke Energy Indiana |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Future investment in infrastructure |  |  |  | $ 1,600 |  |  |  |  |  |
Requested rate increase (decrease), amount |  | $ 385 | $ 296 | $ 492 |  |  |  |  |  |
Requested rate increase, percentage, net of tax |  |  |  | 16.20% |  |  |  |  |  |
Requested return on equity (as a percent) |  |  | 9.75% | 10.50% |  |  |  |  |  |
Equity ratio (as a percent) |  |  | 53.00% | 53.00% |  |  |  |  |  |
2024 Indiana Rate Case | IURC | Duke Energy Indiana | Forecast |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Requested rate increase, percentage, net of tax |  |  |  |  |  |  | 4.50% | 11.70% |  |
Cayuga Combined Cycle CPCN, Gas-Fired | IURC | Duke Energy Indiana |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
New combustion turbines (in megawatts) | MW | 1,476 |  |  |  |  |  |  |  |  |
Cayuga Combined Cycle CPCN, Coal-Fired | IURC | Duke Energy Indiana |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
New combustion turbines (in megawatts) | MW | 1,005 |  |  |  |  |  |  |  |  |
Cayuga Combined Cycle CPCN | IURC | Duke Energy Indiana |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Requested rate increase, percentage, net of tax | 5.40% |  |  |  |  |  |  |  |  |
New combustion turbines (in megawatts) | MW | 471 |  |  |  |  |  |  |  |  |
Estimated cost of facilities | $ 3,000 |  |  |  |  |  |  |  |  |

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