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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Indiana) (Details) - USD ($) $ in Millions |  |  |  |  | 3 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jul. 28, 2021 | Jun. 29, 2020 | Dec. 04, 2019 | Jul. 02, 2019 | Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2020
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  | $ 215 |  |
Operating revenues |  |  |  |  | 7,132 | $ 6,150 |
Duke Energy Indiana |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  | 211 |  |
Operating revenues |  |  |  |  | 822 | $ 745 |
Duke Energy Indiana | IURC | Indiana rate case 2019 |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  | $ 395 |  |  |
Requested rate increase, percentage, net of tax |  |  | 15.60% |  |  |  |
Requested rate increase (decrease), amended amount |  |  | $ 396 |  |  |  |
Approved rate increase, amount |  | $ 146 |  |  |  |  |
Rate base |  |  |  |  |  |  | $ 10,200
Reduction of requested rate increase |  | $ 200 |  |  |  |  |
Reduction due to depreciation methodology |  | 50.00% |  |  |  |  |
Reduction due to approved return on equity |  | 20.00% |  |  |  |  |
Approved return on equity percentage | 9.70% | 9.70% |  |  |  |  |
Requested return on equity, percent |  | 10.40% |  |  |  |  |
Reduction due to earnings adjustments |  | 20.00% |  |  |  |  |
Estimated percentage of total rate increase, step one |  | 75.00% |  |  |  |  |
Estimated percentage of total rate increase, step two | 25.00% |  |  |  |  |  |
Public utilities, approved equity capital structure, percentage | 54.00% |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  | 211 |  |
Operating revenues |  |  |  |  | $ 46 |  |

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