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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Indiana) (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 04, 2024 | Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2026 | Dec. 31, 2025 | Sep. 20, 2023 | Jun. 15, 2022
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Impairment of assets and other charges |  | $ 1 | $ 8 |  |  |  |
Operating Revenues |  | 7,671 | 7,276 |  |  |  |
Duke Energy Indiana |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Operating Revenues |  | $ 759 | $ 975 |  |  |  |
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 | Subsequent event |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Future investment in infrastructure | $ 1,600 |  |  |  |  |  |
Requested rate increase (decrease), amount | $ 492 |  |  |  |  |  |
Requested rate increase, percentage, net of tax | 16.20% |  |  |  |  |  |
Requested return on equity (as a percent) | 10.50% |  |  |  |  |  |
Equity ratio (as a percent) | 53.00% |  |  |  |  |  |
2024 Indiana Rate Case | IURC | Duke Energy Indiana | Forecast | Subsequent event |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Requested rate increase, percentage, net of tax |  |  |  | 4.50% | 11.70% |  |

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