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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Indiana) (Details) - USD ($) $ in Millions |  |  |  |  | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 28, 2021 | Jun. 29, 2020 | Dec. 04, 2019 | Jul. 02, 2019 | Sep. 30, 2023 | Sep. 30, 2022 | Jun. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022 | Sep. 20, 2023 | Jun. 30, 2023 | Feb. 03, 2023 | Jun. 15, 2022 | Dec. 31, 2020
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  | $ 88 | $ (4) |  | $ 96 | $ 202 |  |  |  |  |  |
Operating Revenues |  |  |  |  | 7,994 | 7,842 |  | 21,848 | 21,417 |  |  |  |  |  |
Duke Energy Indiana |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  | 211 |  |  |  |  |  |
Operating Revenues |  |  |  |  | $ 851 | $ 1,095 |  | $ 2,606 | $ 2,835 |  |  |  |  |  |
Indiana Coal Ash Recovery | IURC | Duke Energy Indiana |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  | $ 175 |  |  |  |  |
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 |
Indiana rate case 2019 | IURC | Duke Energy Indiana |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated percentage of total rate increase, step one |  | 75.00% |  |  |  |  |  |  |  |  |  |  |  |  |
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 (decrease), 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 (as a percent) |  | 9.70% |  |  |  |  |  |  |  |  |  |  |  |  |
Requested return on equity (as a percent) |  | 10.40% |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction due to earnings adjustments |  | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated percentage of total rate increase, step two | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  | $ 211 |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  | $ 46 |  |  |  |  |  |  |  |
Regulatory Matters, Settlement To Customers |  |  |  |  |  |  |  |  |  |  |  | $ 70 | $ 70 |  |

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