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Regulatory Matters (Duke Energy Indiana Narrative) (Details) - Duke Energy Indiana - Indiana Rate Case 2019 - Indiana Utility Regulatory Commission - USD ($) $ in Millions | Jul. 28, 2021 | Jun. 29, 2020 | Dec. 04, 2019 | Jul. 02, 2019 | Dec. 31, 2020
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Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Requested rate increase (decrease) |  |  |  | $ 395 |
Requested rate increase (decrease), percentage, net of tax |  |  | 15.60% |  |
Requested rate increase (decrease), amended, amount |  |  | $ 396 |  |
Approved rate increase (decrease) amount by state commission |  | $ 146 |  |  |
Disclosure of rate matters, rate base |  |  |  |  | $ 10,200
Public utilities, disclosure of rate matters, reduction of rate base |  | $ 200 |  |  |
Public utilities, disclosure of rate matters, rate base reduction due to depreciation methodology, percent |  | 50.00% |  |  |
Public utilities, disclosure of rate matters, rate base reduction due to approved return on equity, percent |  | 20.00% |  |  |
Approved return on equity, percentage | 9.70% | 9.70% |  |  |
Requested return on equity, percentage |  | 10.40% |  |  |
Public utilities, disclosure of rate matters, rate base reduction due to earnings adjustments, percent |  | 20.00% |  |  |
Public utilities, approved return on equity, step one estimated percentage |  | 75.00% |  |  |
Public utilities, approved return on equity, step two estimated percentage |  | 25.00% |  |  |
Approved capital structure, percentage | 54.00% |  |  |  |

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