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Business Segments (Narrative) (Details) $ in Millions |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Sep. 08, 2021 USD ($) | Jan. 28, 2021 USD ($) closing | Mar. 31, 2022 USD ($) segment | Jan. 01, 2023
Duke Energy Indiana | Noncontrolling Interests |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Percentage sold |  | 19.90% |  |
Number of closings | closing |  | 2 |  |
Value of sale of parent interest | $ 1,025 | $ 2,000 |  |
Ownership interest sold | 11.05% |  |  |
Proceed of purchase price for exchange in interest | 50.00% |  |  |
Duke Energy Indiana | Noncontrolling Interests | Forecast |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Percentage sold |  |  |  | 19.90%
Proceed of purchase price for exchange in interest |  |  |  | 50.00%
Duke Energy Ohio |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of reportable segments | segment |  |  | 2 |
Wind and solar | Nonregulated |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Renewable merchant plants |  |  | $ 200 |
Joint owner ownership percentage |  |  | 51.00% |

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