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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Indiana) (Details) - USD ($) |  |  |  |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 28, 2021 | Jun. 29, 2020 | Dec. 04, 2019 | Jul. 02, 2019 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 15, 2022 | Dec. 31, 2020
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  | $ (9,000,000) | $ 131,000,000 | $ 206,000,000 | $ 131,000,000 |  |
Operating Revenues |  |  |  |  | 6,685,000,000 | 5,758,000,000 | 13,817,000,000 | 11,908,000,000 |  |
Duke Energy Indiana |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  | 8,000,000 | 211,000,000 | 8,000,000 |  |
Operating Revenues |  |  |  |  | $ 918,000,000 | $ 735,000,000 | 1,740,000,000 | $ 1,480,000,000 |  |
Duke Energy Indiana | IURC | Indiana rate case 2019 |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  | $ 395,000,000 |  |  |  |  |  |
Requested rate increase, percentage, net of tax |  |  | 15.60% |  |  |  |  |  |  |
Requested rate increase (decrease), amended amount |  |  | $ 396,000,000 |  |  |  |  |  |  |
Approved rate increase, amount |  | $ 146,000,000 |  |  |  |  |  |  |  |
Rate base |  |  |  |  |  |  |  |  |  | $ 10,200,000,000
Reduction of requested rate increase |  | $ 200,000,000 |  |  |  |  |  |  |  |
Reduction due to depreciation methodology |  | 50.00% |  |  |  |  |  |  |  |
Reduction due to approved return on equity |  | 20.00% |  |  |  |  |  |  |  |
Approved return on equity percentage (as a percent) |  | 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% |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  | 211,000,000 |  |  |
Operating Revenues |  |  |  |  |  |  | $ 46,000,000 |  |  |
Duke Energy Indiana | IURC | TDSIG 2.0 |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Future investment in infrastructure |  |  |  |  |  |  |  |  | $ 2,000,000,000 |

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