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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 | Dec. 04, 2019 | Sep. 09, 2019 | Jul. 02, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Public Utilities, General Disclosures [Line Items] |  |  |  |
Requested rate increase (decrease) |  | $ 395 | $ 395 |
Disclosure of rate matters, rate base |  |  |  | $ 10,200
Requested rate increase (decrease), amended, amount | $ 396 | 393 |  |
Requested rate increase (decrease), amount amended from initial request |  | $ (2) |  |
Requested rate increase (decrease), percent |  |  | 15.00% |
Requested rate increase (decrease), percentage, net of tax | 15.60% |  | 17.00% |

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